JPH07107721B2 - Degradation detection method for file storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a large degree of deterioration in the maintenance of a file storage device (hereinafter abbreviated as a device) and a volume (medium in which data is recorded), and maintenance is required. The present invention relates to a deterioration degree detecting method for specifying a device and a volume.

(Prior Art) Conventionally, statistical information has been collected, edited, and managed on a device-by-device basis. The statistical information is information that reflects deterioration information of the device or the volume generated during use of the device or the volume, and is important as information for pre-maintenance. For example, in the case of a magnetic tape device, the number of data reads corrected by the error correction function, the number of load retries,
The number of unload retries and the like.

(Problems to be Solved by the Invention) Conventionally, since this statistical information has been collected, edited, and managed on a device-by-device basis, it has been difficult to grasp the deterioration information regarding the volume from this. In particular, when any volume is evenly mounted on all devices, it is difficult to extract the deterioration degree of the volume because the volume information is uniformly reflected on all the devices. For this reason, it is difficult for the conventional method to recognize the deterioration of the volume at an early stage and to grasp the timing of maintenance such as performing the volume copy.

(Object of the Invention) An object of the present invention is to provide a method for separating a deterioration state of a device and a deterioration state of a volume from statistical information of the device in a file storage device, and improve maintainability by indicating a trigger for volume maintenance. Another object is to provide a highly reliable file storage system.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a plurality of file storage devices and a plurality of volumes mounted on arbitrary file storage devices and for reading and writing data, Demounting a volume from a file storage device in a file storage system deterioration detection method that collects, edits, and manages statistical information reflecting deterioration of the file storage device or volume that occurs for each read / write at least in file storage device units. The statistical information is stored for each file storage device in association with each volume combination, and the degree of deterioration of the film storage device is detected from the statistical information corresponding to all the volumes of each file storage device. Detects the degree of volume deterioration from statistical information corresponding to all file storage devices for each I decided to do it.

(Operation) According to the present invention, statistical information is accumulated for each demount of a volume in association with a combination of each file storage device and each volume. However, when a certain file storage device is deteriorated, each file storage device is stored. Of the statistical information corresponding to all volumes of each device, only the statistical information corresponding to the corresponding file storage device shows a significantly different value as compared to the statistical information corresponding to other file storage devices, and a certain volume is degraded. If so, among the statistical information corresponding to all the file devices of each volume, only the statistical information corresponding to the relevant volume shows a value significantly different from the statistical information corresponding to the other volumes. Detection of the degree of deterioration of the file storage device or volume from the accumulated statistical information, for example, the characteristic of the deteriorated file storage device or volume. Can be set.

(Embodiment) FIG. 1 is a diagram for explaining an embodiment of the present invention. 1 is MTU
A file storage device (hereinafter, referred to as a device) that is a maintenance target such as, and has a function of creating statistical information. Reference numeral 2 is a means for reading statistical information, and 3 is a statistical information log file that stores data for each correspondence between a device and a volume, the format of which is shown in FIG. Reference numeral 4 is a statistical data updating means for updating the data on the statistical information log file 3, and 5 is for testing the significance of the degree of deterioration between devices and volumes based on the data on the statistical information log file 3. Is a means for testing the significant difference. The means 2, 4, 5 are executed by a computer or a controller provided in the file storage device 1. Reference numeral 6 is a means for outputting a maintenance message based on the test result of the significant difference test means 5, such as a display or a printer.

FIG. 2 is a diagram showing an operation flow of the embodiment shown in FIG. This operation flow includes two processes, namely, the process of reading statistical information indicated by the one-dot chain line, the process of updating the statistical information management table, and the process indicated by the two-dot chain line for significance testing between devices and volumes.
Composed of two. Each of these may be performed in the same process, or only the latter may be independent as a utility. That is, the volume is processed in the file storage device 1 (S1), the statistical information is read from the device Um every time the volume is demounted (S2) (S3), and the device in the table described later on the statistical information log file 3 is read. The data corresponding to Um and volume Vn is updated. In this way, the update data of the device and each volume accumulated in the statistical information log file 3 is read as appropriate and the significance test between the devices and between the volumes is performed (S5), and it is determined whether there is significance or not. Is performed (S6), and if there is, the deterioration degree information is displayed by the output means 6 together with the device / volume distinction (S7), and the device / volume is maintained.

The effect of the present invention does not depend on the configuration of this operation flow. Further, particularly in a storage device that manages volumes on the device side, the statistical information may be edited and managed by the storage device itself in response to a demount request. That is, volume management may be realized on the host machine or may be realized in the storage device.

FIG. 3 is a statistical information management table in which the latest statistical information corresponding to the device of each volume is set in the horizontal direction.
The latest statistical information corresponding to the volume of each device is set in the vertical direction. For example, Dmn indicates the latest statistical information when the volume of volume number N is processed on the device of M number. From this management table, test the significance between devices and volumes from the size of statistical information, and if the test can be performed and if the higher the number, the greater the deterioration, then the device or volume with the highest number is selected. Just maintain it. If the smaller the number, the greater the deterioration, the device or volume with the smaller number may be maintained.

In general, a plurality of devices and a plurality of volumes may be deteriorated at the same time. Therefore, it is necessary to detect the deteriorated plurality of devices and volumes by excluding the deteriorated devices and volumes from the table and repeating the test. .

The method of this test may be based on the analysis of variance that is usually performed. Each data Dmn consists of an average value for a device / volume, a device-to-device variation (effect due to device difference), a volume-to-volume variation (effect due to volume difference), and a process-to-process variation (error). Therefore, the error,
The effect between devices, the effect between volumes, and the respective unbiased distributions are obtained, the unbiased distribution between the device / volume and the error variance are calculated, and the ratio of the unbiased variance between the device / volume and the error variance is F distribution. The significance can be tested by following

The statistical information generally includes a plurality of items. Therefore, there are as many tables as there are items. That is, it is necessary to perform the above test on all tables.

Further, the following empirical method is also possible without using the analysis of variance as described above as a means for testing.

That is, the range of the steady statistical information value of each device and volume is empirically grasped, and the threshold value is set based on this.
This is a method of recognizing that maintenance is required due to exceeding this.

(Effects of the Invention) As described above, according to the present invention, since the degree of deterioration can be detected by separating each of the device and the volume, there is an advantage that the volume can be preliminarily maintained not only in the device but also in advance. The present invention is useful not only for a storage device using a commutative medium but also for a storage device using a non-commutable medium in order to discriminate between a deteriorated portion and a portion other than the medium.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, which is an example of the configuration of an apparatus that acquires the statistical information and detects the degree of deterioration of the apparatus or the volume based on the statistical information. FIG. 2 is an operation flow relating to the processing of FIG. FIG. 3 is a statistical information management table in which statistical information data is summarized in a table corresponding to combinations of devices and volumes. 1 ... File storage device, 2 ... Statistical information reading means, 3 ... Statistical information log file, 4 ... Statistical data updating means, 5 ... Significant difference testing means, 6 ... Maintenance message output means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akihiro Hayakawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Michio Matsuura 1015, Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (1)

[Claims] 1. A plurality of file storage devices, and a plurality of volumes mounted and mounted on an arbitrary file storage device for reading and writing data, wherein deterioration of the file storage device or volume that occurs each time data is read and written is reflected. Collected statistical information at least in file storage units
In a method of detecting a deterioration degree of a file storage system to be edited / managed, each time a volume is demounted from a file storage device, the statistical information is accumulated in association with each file storage device and each volume combination, and each file storage device is stored. File storage system that detects the degree of deterioration of the file storage device from the statistical information corresponding to all the volumes of the volume, and detects the deterioration degree of the volume from the statistical information that corresponds to all the file storage devices of each volume. Deterioration degree detection method.