WO2003054711A1 - Systeme et procede de gestion d'une zone de stockage pour reseau - Google Patents

Systeme et procede de gestion d'une zone de stockage pour reseau Download PDF

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Publication number
WO2003054711A1
WO2003054711A1 PCT/US2002/029721 US0229721W WO03054711A1 WO 2003054711 A1 WO2003054711 A1 WO 2003054711A1 US 0229721 W US0229721 W US 0229721W WO 03054711 A1 WO03054711 A1 WO 03054711A1
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WIPO (PCT)
Prior art keywords
storage
node
change
area network
server
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Application number
PCT/US2002/029721
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English (en)
Other versions
WO2003054711A9 (fr
Inventor
Corene Casper
Kenneth F. Dove
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Polyserve, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polyserve, Inc. filed Critical Polyserve, Inc.
Priority to AU2002336620A priority Critical patent/AU2002336620A1/en
Priority claimed from US10/251,894 external-priority patent/US7240057B2/en
Publication of WO2003054711A1 publication Critical patent/WO2003054711A1/fr
Publication of WO2003054711A9 publication Critical patent/WO2003054711A9/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/18—File system types
    • G06F16/182—Distributed file systems
    • G06F16/1824—Distributed file systems implemented using Network-attached Storage [NAS] architecture
    • G06F16/1827—Management specifically adapted to NAS

Definitions

  • 60/324,224 (Attorney Docket No. POLYP003+) entitled COLLABORATIVE CACHING IN A MULTI-NODE FILESYSTEM filed September 21, 2001, which is incorporated herein by reference for all purposes.
  • This application claims priority to U.S. Provisional Patent Application No 60/324,242 (Attorney Docket No. POLYP005+) entitled DISTRIBUTED MANAGEMENT OF A STORAGE AREA NETWORK filed September 21, 2001, which is incorporated herein by reference for all purposes.
  • the present invention relates generally to computer systems.
  • the present invention relates to computer systems that share resources such as storage.
  • Servers are typically used for big applications and work loads such as those used in conjunction with large web services and manufacturing. Often, a single server does not have enough power to perform the required application. Several servers may be used in conjunction with several storage devices in a storage area network (SAN) to accommodate heavy traffic. As systems get larger, applications often need to be highly available to avoid interruptions in service.
  • SAN storage area network
  • a typical server management system uses a single management control station that manages the servers and the shared storage.
  • a potential problem of such a system is that it may have a single point of failure which can cause a shut-down of the entire storage area network to perform maintenance.
  • Another potential problem is that there is typically no dynamic cooperation between the servers in case a change to the system occurs. Often in such a system all servers need be shutdown to perform a simple reconfiguration of the shared storage. This type of interruption is typically unacceptable for mission critical applications
  • Fig. 1 is a block diagram of a shared storage system suitable for facilitating an embodiment of the present invention.
  • Fig. 2 is another block diagram of a system according to an embodiment of the present invention.
  • Fig. 3 is a block diagram of the software components of a server according to an embodiment of the present invention.
  • Figs. 4A-4B are flow diagrams of a method according to an embodiment of the present invention for adding a node.
  • Figs. 5A-5C are flow diagrams of a method according to the present invention for handling a server failure.
  • Fig. 6 is flow diagram of a method according to an embodiment of the present invention for adding or removing shared storage.
  • Fig. 7 is a flow diagram of a method according to an embodiment of the present invention for managing a storage area network.
  • Fig. 8 is a flow diagram of a method managing a storage area network in a first node according to an embodiment of the present invention.
  • the present invention can be implemented in numerous ways, including as a process, an apparatus, a system, or a computer readable medium such as a computer readable storage medium or a computer network wherein program instructions are sent over optical or electronic communication links. It should be noted that the order of the steps of disclosed processes may be altered within the scope of the invention.
  • Fig. 1 is a block diagram of a shared storage system suitable for facilitating the management of a storage area network according to an embodiment of the present invention.
  • nodes 102A-102D are coupled together through a network switch 100.
  • the network switch 100 can represent any network infrastructure such as an Ethernet.
  • the nodes 102A-102D are also shown to be coupled to a data storage interconnect 104.
  • An example of the data storage interconnect 104 is a fiber channel switch, such as a Brocade fiber channel switch.
  • nodes 102A-102D include but are not limited to computers, servers, and any other processing units or applications that can share storage or data.
  • nodes 102A-102D will sometimes be referred to as servers.
  • the data interconnect 104 is shown to be coupled to shared storage 106A-106D. Examples of shared storage 106A-106D include any form of storage such as hard drive disks, compact disks, tape, and random access memory.
  • Fig. 1 Although the system shown in Fig. 1 is a multiple node system, the present invention can also be used with a single computer system for synchronizing various applications as they share data on a shared storage.
  • Shared storage can be any storage device, such as hard drive disks, compact disks, tape, and random access memory.
  • a filesystem is a logical entity built on the shared storage. Although the shared storage is typically considered a physical device while the filesystem is typically considered a logical structure overlaid on part of the storage, the filesystem is sometimes referred to herein as shared storage for simplicity. For example, when it is stated that shared storage fails, it can be a failure of a part of a filesystem, one or more filesystems, or the physical storage device on which the filesystem is overlaid. Accordingly, shared storage, as used herein, can mean the physical storage device, a portion of a filesystem, a filesystem, filesystems, or any combination thereof.
  • FIG. 2 is another block diagram of a system according to an embodiment of the present invention.
  • the system preferably has no single point of failure.
  • servers 102 A' - 102D' are coupled with multiple network interconnects 100A-100D.
  • the servers 102A-102D' are also shown to be coupled with multiple storage interconnects 104A-104B.
  • the storage interconnects 104A- 104B are each coupled to a plurality of data storage 106A'-106D ⁇
  • the number of servers 102 A- 102D', the number of storage interconnects 104 A- 104B, and the number of data storage 106 -106D' can be as many as the customer requires and is not physically limited by the system.
  • the operating systems used by servers lOOA'-lOOD' can also be as many independent operating systems as the customer requires.
  • Fig. 3 is a block diagram of the software components of server 100. In this embodiment, the following components are shown:
  • the Distributed Lock Manager (DLM) 500 manages matrix-wide locks for the filesystem image 306a-306d, including the management of lock state during crash recovery.
  • the Matrix Filesystem 504 uses DLM 500-managed locks to implement matrix-wide mutual exclusion and matrix-wide filesystem 306a-306d metadata and data cache consistency.
  • the DLM 500 is a distributed symmetric lock manager.
  • the lock-caching layer (“LCL”) 502 is a component internal to the operating system kernel that interfaces between the Matrix Filesystem 504 and the application- level DLM 500.
  • the purposes of the LCL 502 include the following:
  • DLM 500 It caches DLM 500 locks (that is, it may hold on to DLM 500 locks after clients have released all references to them), sometimes obviating the need for kernel components to communicate with an application-level process (the DLM 500) to obtain matrix-wide locks.
  • the LCL 502 is the only kernel component that makes lock requests from the user-level DLM 500. It partitions DLM 500 locks among kernel clients, so that a single DLM 500 lock has at most one kernel client on each node, namely, the LCL 502 itself. Each DLM 500 lock is the product of an LCL 502 request, which was induced by a client's request of an LCL 502 lock, and each LCL 502 lock is backed by a DLM 500 lock.
  • the Matrix Filesystem 504 is the shared filesystem component of The Matrix Server.
  • the Matrix Filesystem 504 allows multiple servers to simultaneously mount, in read/write mode, filesystems living on physically shared storage devices 306a- 306d.
  • the Matrix Filesystem 504 is a distributed symmetric matrixed filesystem; there is no single server that filesystem activity must pass through to perform filesystem activities.
  • the Matrix Filesystem 504 provides normal local filesystem semantics and interfaces for clients of the filesystem.
  • SAN (Storage Area Network) Membership Service 506 provides the group membership services infrastructure for the Matrix Filesystem 504, including managing filesystem membership, health monitoring, coordinating mounts and unmounts of shared filesystems 306a-306d, and coordinating crash recovery.
  • Matrix Membership Service 508 provides the Local, matrix-style matrix membership support, including virtual host management, service monitoring, notification services, data replication, etc.
  • the Matrix Filesystem 504 does not interface directly with the MMS 508, but the Matrix Filesystem 504 does interface with the SAN Membership Service 506, which interfaces with the MMS 508 in order to provide the filesystem 504 with the matrix group services infrastructure.
  • the Shared Disk Monitor Probe 510 maintains and monitors the membership of the various shared storage devices in the matrix. It acquires and maintains leases on the various shared storage devices in the matrix as a protection against rogue server "split-brain" conditions. It communicates with the SMS 506 to coordinate recovery activities on occurrence of a device membership transition.
  • Filesystem monitors 512 are used by the SAN Membership Service 508 to initiate Matrix Filesystem 504 mounts and unmounts, according to the matrix configuration put in place by the Matrix Server user interface.
  • the Service Monitor 514 tracks the state (health & availability) of various services on each server in the matrix so that the matrix server may take automatic remedial action when the state of any monitored service transitions.
  • Services monitored include HTTP, FTP, Telnet, SMTP, etc.
  • the remedial actions include service restart on the same server or service fail-over and restart on another server.
  • the Device Monitor 516 tracks the state (health & availability) of various storage-related devices in the matrix so that the matrix server may take automatic remedial action when the state of any monitored device transitions.
  • Devices monitored may include data storage devices 306a-306d (such as storage device drives, solid state storage devices, ram storage devices, JOBDs, RAID arrays, etc.)and storage network devices 304' (such as FibreChannel Switches, Infiniband Switches, iSCSI switches, etc.).
  • the remedial actions include initiation of Matrix Filesystem 504 recovery, storage network path failover, and device reset.
  • the Application Monitor 518 tracks the state (health & availability) of various applications on each server in the matrix so that the matrix server may take automatic remedial action when the state of any monitored application transitions.
  • Applications monitored may include databases, mail routers, CRM apps, etc.
  • the remedial actions include application restart on the same server or application fail-over and restart on another server.
  • the Notifier Agent 520 tracks events associated with specified objects in the matrix and executes supplied scripts of commands on occurrence of any tracked event.
  • the Replicator Agent 522 monitors the content of any filesystem subtree and periodically replicates any data which has not yet been replicated from a source tree to a destination tree.
  • the Replicator Agent 522 is preferably used to duplicate file private files between servers that are not accessed using Shared Data Storage (306).
  • the Matrix Communication Service 524 provides the network communication infrastructure for the DLM 500, Matrix Membership Service 508, and SAN Membership Service 506.
  • the Matrix Filesystem 504 does not use the MCS 524 directly, but it does use it indirectly through these other components.
  • the Storage Control Layber (SCL) 526 provides matrix-wide device identification, used to identify the Matrix Filesystems 504 at mount time.
  • the SCL 526 also manages storage fabric configuration and low level I/O device fencing of rogue servers from the shared storage devices 306a-306d containing the Matrix Filesystems 504. It also provides the ability for a server in the matrix to voluntarily intercede during normal device operations to fence itself when communication with rest of the matrix has been lost.
  • the Storage Control Layer 526 is the Matrix Server module responsible for managing shared storage devices 306a-306d. Management in this context consists of two primary functions. The first is to enforce I/O fencing at the hardware SAN level by enabling/disabling host access to the set of shared storage devices 306a-306d.
  • the SCL module also includes utilities and library routines needed to provide device information to the UI.
  • the Pseudo Storage Driver 528 is a layered driver that "hides” a target storage device 306a-306d so that all references to the underlying target device must pass through the PSD layered driver.
  • the PSD provides the ability to "fence” a device, blocking all I/O from the host server to the underlying target device until it is unfenced again.
  • the PSD also provides an application-level interface to lock a storage partition across the matrix. It also has the ability to provide common matrix- wide 'handles', or paths, to devices such that all servers accessing shared storage in the Matrix Server can use the same path to access a given shared device.
  • Figs. 4A-4B are flow diagrams of a method according to an embodiment of the present invention for adding a node to a cluster of servers sharing storage such as a disk.
  • the cluster includes the set of servers that cooperate to share a shared resource such as the shared storage.
  • One of the servers in the cluster is dynamically elected to act as an administrator to manage the shared storage in the cluster. If there is no administrator in the cluster, then it is determined whether this server can try to become the administrator (408). If this server can try to become the . administrator then the server begins an election process shown in figures 5B-5C , and successful completion of this process results in the election of this server as the administrator.
  • the group coordinator selects a server to try to become the new administrator (704 Fig. 5A).
  • An example of how this server can not become the administrator (408) is if another server became the administrator during the time this server established that there was no administrator and then tried to become the administrator, or it had faulty connectivity to the storage network. In this case a partial failure recovery is started in step 704 of Fig. 5 A. If there is an existing administrator in the cluster (400), the existing administrator is then asked to import the new server into the cluster (402). It is then determined whether it is permissible for this server to be imported into the cluster (404). If it is not permissible then the process of adding this server to the cluster has failed (412). Examples of reasons why adding the server would fail include this server not being healthy or having a storage area network generation number mismatch with the generation number used by the administrator.
  • this server If this server can be imported (404), then it receives device names from the administrator (406). Examples of device names include cluster wide names of shared storage.
  • the administrator grants physical storage area network access to this server (410 of Fig. 4B).
  • the administrator then commands the physical hardware to allow this server storage area network (SAN) access (412).
  • This server now has access to the SAN (414).
  • SAN server storage area network
  • Figs. 5A-5C are flow diagrams of a method according to the present invention for handling a server failure , software component, or SAN generation number mismatch
  • a server or communication with a server has failed (700). It is then determined whether there is still an administrator (702). For example, the server that failed may have been the administrator. If there is still an administrator then the failed server is physically isolated (708). An example of physically isolating the failed server is to disable the fiber channel switch port associated with the failed server.
  • the storage area network generation number is then updated and stored to the database (710). Thereafter, normal operation continues (712).
  • a server is selected to try and become the new administrator (704).
  • One example is a random selection of one of the servers.
  • the elected server is then told to try to become the new administrator (706).
  • One example of how the server is selected and told to become the new administrator is through the use of a group coordinator.
  • the group coordinator is elected during the formation of a process communication group using an algorithm that can uniquely identify the coordinator of the group with no communication with any server or node except that required to agree on the membership of the group. For example, the server with the lowest numbered Internet Protocol (IP) address of the members can be selected.
  • IP Internet Protocol
  • the coorindator can then make global decisions for the group of servers, such as the selection of a possible administrator.
  • the server selected as administrator is preferably one which has a high probability of success of actually becoming the administrator.
  • the group coordinator attempts to place the administrator on a node which might be able to connect the SAN hardware and has not recently failed in an attempt to become the SAN administrator.
  • the selected server attempts to acquire the storage area network locks (720). If it cannot acquire the SAN locks, then it has failed to become the administrator (724). If it succeeds in acquiring the SAN locks (720), then it attempts to read the SAN generation number from the membership database (722).
  • the database can be maintained in one of the membership partitions on a shared storage and can be co-resident with the SAN locks.
  • a server may fail to acquire the SAN locks for several reasons including but not limited to physical storage isolation, ownership of the SAN locks by an existing administrator in the cluster or ownership by another cluster on the same storage fabric.
  • the server fails to read the SAN generation number from the database (722), then it drops the SAN locks (726), and it has failed to become the administrator (724). Once the server has failed to become the administrator (724), the group coordinator selects a different server to try to become the new administrator (704 Fig. 5A).
  • the server can read the SAN generation number from the database, then it increments the SAN generation number and stores it back into the database (728). It also informs the group coordinator that this server is now the administrator (730). The group coordinator receives the administrator update (732). It is then determined if it is permissible for this server to be the new administrator (750). If it is not okay, then a message to undo the administrator status is sent to the current server trying to become the administrator (752). Thereafter, the group coordinator selects a server to try to become the new administrator (704 of Fig. 5A).
  • Fig. 6 is flow diagram of a method according to an embodiment of the present invention for adding or removing shared storage.
  • a request is sent from a server to the administrator to add or remove a shared storage (600), such as a disk.
  • the disk is then added or removed to the naming database (602).
  • the naming database is preferably maintained on the shared storage accessible by all servers and the location is known by all servers before they join the cluster. Servers with no knowledge of the location of a naming database are preferably not eligible to become a SAN administrator but may join a cluster with a valid administrator.
  • the SAN generation number is then incremented (604).
  • Each server in the cluster is then informed of the SAN generation number and the addition or deletion of the new disk (606).
  • the new SAN generation number is written to the database (608).
  • the requesting server is then notified that the addition/removal of the disk is complete (610).
  • Fig. 7 is a flow diagram of a method according to an embodiment of the present invention for managing a storage area network.
  • a plurality of nodes is provided (800).
  • a plurality of storage is also provided, wherein the plurality of storage is shared by the plurality of nodes (802). It is determined whether a change in the storage area network has occurred (804). Examples of a change include structural changes such as adding a server, deleting a server, adding a storage, deleting a storage, connecting or disconnecting an interface. If a change has occurred, then the system dynamically adjusts to the change (806).
  • Fig. 8 is a flow diagram of a method managing a storage area network in a first node according to an embodiment of the present invention.
  • the first node communicates with a second node (900), and communicates with at least one storage (902), wherein the storage is shared by the first node and the second node. It is determined if a change in the storage area network has occurred (904). If a change has occurred, then the first node adjusts dynamically to the change (906).

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Databases & Information Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

Cette invention concerne un système et un procédé de gestion d'une zone de stockage pour réseau. Dans un mode de réalisation, ce procédé consiste à prendre une pluralité de noeuds et une pluralité de zones de stockage, la pluralité de zones de stockage étant partagée par la pluralité de noeuds, et à déterminer si un changement est survenu dans une zone de stockage pour, le cas échéant, opérer une adaptation dynamique à ce changement. Dans un autre mode de réalisation, le système comprend un processeur conçu pour communiquer avec un second noeud et au moins une zone de stockage. La zone de stockage est partagée par le processeur et le second noeud. Le processeur est en outre en mesure de déterminer si un changement s'est produit dans la zone de stockage et, le cas échéant, de s'adapter à ce changement. Une mémoire est couplée au processeur auquel elle fournit des instructions.
PCT/US2002/029721 2001-09-21 2002-09-20 Systeme et procede de gestion d'une zone de stockage pour reseau WO2003054711A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002336620A AU2002336620A1 (en) 2001-09-21 2002-09-20 A system and method for management of a storage area network

Applications Claiming Priority (30)

Application Number Priority Date Filing Date Title
US32419601P 2001-09-21 2001-09-21
US32424301P 2001-09-21 2001-09-21
US32422601P 2001-09-21 2001-09-21
US32424201P 2001-09-21 2001-09-21
US32419501P 2001-09-21 2001-09-21
US32422401P 2001-09-21 2001-09-21
US60/324,224 2001-09-21
US60/324,243 2001-09-21
US60/324,226 2001-09-21
US60/324,196 2001-09-21
US60/324,195 2001-09-21
US60/324,242 2001-09-21
US32478701P 2001-09-24 2001-09-24
US60/324,787 2001-09-24
US32719101P 2001-10-01 2001-10-01
US60/327,191 2001-10-01
US10/251,894 US7240057B2 (en) 2001-09-21 2002-09-20 System and method for implementing journaling in a multi-node environment
US10/251,689 2002-09-20
US10/251,894 2002-09-20
US10/251,690 2002-09-20
US10/251,626 2002-09-20
US10/251,895 US7437386B2 (en) 2001-09-21 2002-09-20 System and method for a multi-node environment with shared storage
US10/251,626 US7111197B2 (en) 2001-09-21 2002-09-20 System and method for journal recovery for multinode environments
US10/251,645 2002-09-20
US10/251,893 2002-09-20
US10/251,893 US7266722B2 (en) 2001-09-21 2002-09-20 System and method for efficient lock recovery
US10/251,690 US7496646B2 (en) 2001-09-21 2002-09-20 System and method for management of a storage area network
US10/251,895 2002-09-20
US10/251,689 US7149853B2 (en) 2001-09-21 2002-09-20 System and method for synchronization for enforcing mutual exclusion among multiple negotiators
US10/251,645 US20040202013A1 (en) 2001-09-21 2002-09-20 System and method for collaborative caching in a multinode system

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WO2003054711A9 WO2003054711A9 (fr) 2004-05-13

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PCT/US2002/030084 WO2003025802A1 (fr) 2001-09-21 2002-09-20 Systeme et procede de gestion cooperante d'antememoire dans un systeme multi-noeud

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AU2002336620A8 (en) 2003-07-09
AU2002336620A1 (en) 2003-07-09

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