Start RAID Group Diagnosis

Overview

This function is used to check the integrity of the RAID group during restoration from an error status of the storage system, such as simultaneous failure of multiple CMs and multiple drive failure, especially where the integrity of the user data is a concern.

This enables the starting and stopping of RAID group diagnosis.

Requirements for Starting the RAID Group Diagnosis

  • The status of the RAID group is "Available"

  • The RAID level is not "RAID0"

  • Volumes are created in the RAID group

  • The RAID group is not blocked

  • The RAID group is not registered as an Extreme Cache Pool

  • One of the following functions is not being performed for the target RAID group

    • Format Volume (*)

    • Expand Volume (*)

    • Encrypt Volume (*)

    • RAID Migration (*)

    • Expand RAID Group (*)

    • Rebuild, Copyback, or Redundant Copy

    • RAID Group Diagnosis (*)

    • Disk Diagnosis (*)

    • Capacity releasing of the RAID group which belongs to a TPP

    • Capacity releasing of the RAID group which belongs to an FTRP

    • Balancing TPV (*)

    • Balancing FTRP (*)

    *: Note that RAID group diagnosis cannot be started even when these functions are performed for other RAID groups in the storage system.

Caution

  • RAID group diagnosis starts in cold mode. Before starting the RAID group diagnosis, stop host access.

  • Do not start the RAID group diagnosis while functions (Advanced Copy, Initialize SDV, etc.) for accessing the drive are running.

  • If RAID group diagnosis is already running, a new RAID group diagnosis cannot be started.

  • Once a RAID group diagnosis is started, other functions cannot be executed until the diagnosis is complete and the diagnosis results (diagnosis detailed information and error detailed information) are cleared.

  • Do not perform RAID group diagnosis for RAID groups that have volumes with Storage Migration paths.

  • When selecting multiple RAID groups to start a RAID diagnosis, the diagnosis cannot be started if one of the selected RAID group does not satisfy the required conditions. Refer to "Requirements for Starting the RAID Group Diagnosis" for details.

User Privileges

Availability of Executions in the Default Role

Default role Availability of executions
Monitor  
Admin  
StorageAdmin  
AccountAdmin  
SecurityAdmin  
Maintainer

Refer to "User Roles and Policies" for details on the policies and roles.

Settings

Select the recovery mode when executing RAID group diagnosis.

RAID Group Diagnosis

Item Description Setting values

Recovery Mode

Select the recovery mode.

In any of the following modes, the RAID group diagnosis continues without stopping even when an error occurs.

  • Recover errors other than "compare error"

    If errors other than the compare error occur, the storage system will automatically recover these errors.

  • Recover any errors

    The location where an error occurred is automatically recovered.

    The recovery process varies depending on the RAID level, but this refers to the process for recovering the redundancy of the RAID group, such as by copying user data, regenerating parity, etc.

  • Don't recover any errors

    The location where an error occurred is not automatically recovered.

Recover errors other than "compare error"

Recover any errors

Don't recover any errors

Display Contents

The information of the selected RAID group is displayed.

Target RAID Groups

Item Description

No.

The RAID group number is displayed.

Name

The RAID group name is displayed.

Status

The RAID group status is displayed.

Refer to "RAID Group Status" for details.

Usage

The usage of the RAID group is displayed.

  • Standard

    A RAID group that is used for creating "Standard", "SDV", or "SDPV" type volumes.

  • Standard / WSV

    A RAID group that is used for creating the following volumes:

    • "WSV" and "Standard"

    • "WSV" and "SDV"

    • "WSV" and "SDPV"

  • WSV

    A RAID group that is used for creating "WSV" type volumes.

  • TPP

    A RAID group that belongs to a TPP.

  • FTRP

    A RAID group that belongs to an FTRP.

  • RDB

    A RAID group that is registered as an REC Disk Buffer.

  • Temporary

    A RAID group that is temporarily created while LDE is being performed.

RAID Level

The RAID level is displayed.

High Performance (RAID1+0)

High Capacity (RAID5)

High Reliability (RAID6)

High Reliability (RAID6-FR)

Reliability (RAID5+0)

Mirroring (RAID1)

Total Capacity

The total capacity of the RAID groups is displayed.

[Display RAID Group Diagnosis Information] Screen

This screen displays the RAID group diagnosis progress. Detailed diagnosis results can be checked by clicking the [Name] link.

RAID Group Diagnosis

Item Description

Diagnosis Status

The general status of all the RAID group diagnoses that are being performed is displayed.

Before Diagnosis

Diagnosing

Complete

Cancel

Recovery Mode

The recovery mode is displayed.

Recover errors other than "compare error"

Recover any errors

Don't recover any errors

Diagnosis Progress

The general progress of all the RAID group diagnoses that are being performed is displayed as a ratio (0 to 100 %) and a bar.

Target RAID Groups

Item Description

Checkbox

Select the RAID group for which the RAID group diagnosis is to be stopped.

No.

The RAID group number is displayed.

Name

The RAID group name is displayed.

By clicking this item, [Display Detailed RAID Group Diagnosis Information] Screen is displayed.

Status

The RAID group status is displayed.

Refer to "RAID Group Status" for details.

RAID Level

The RAID level is displayed.

High Performance (RAID1+0)

High Capacity (RAID5)

High Reliability (RAID6)

High Reliability (RAID6-FR)

Reliability (RAID5+0)

Mirroring (RAID1)

Total Capacity

The total capacity of the RAID groups is displayed.

Diagnosis Status

The RAID group diagnosis status is displayed.

Not Target

Before Diagnosis

Diagnosing

Complete

Cancel

Error Stopped

Diagnosis Result

The RAID group diagnosis results are displayed.

Normal

Warning

Error

Cancel

Function Button

Button Description

[Stop]

Stops the diagnosis for the selected RAID group (multiple selections can be made).

[Refresh]

Updates "Diagnosis Status" and "Diagnosis Result" of all the RAID group diagnoses.

[Done]

Completes all the RAID group diagnoses. By clicking this button, the RAID group diagnosis results are deleted.

The [Done] button can be clicked when "Diagnosis Status" is not "Diagnosing".

[Display Detailed RAID Group Diagnosis Information] Screen

In this screen, the detailed diagnosis results are displayed.

RAID Group Diagnosis

Item Description

Diagnosis Status

The RAID group diagnosis status is displayed.

Not Target

Before Diagnosis

Diagnosing

Complete

Cancel

Error Stopped

Recovery Mode

The recovery mode is displayed.

Recover errors other than "compare error"

Recover any errors

Don't recover any errors

Diagnosis Result

The RAID group diagnosis results are displayed.

Normal

Warning

Error

Cancel

Diagnosis Progress

The progress of a RAID group diagnosis is displayed with a bar and a ratio (0 to 100 %).

RAID Group Diagnosis Completed LBA Count

The number of blocks where diagnosis has been complete in the RAID group is displayed.

RAID Group Total LBA Count

The total number of blocks in the RAID group is displayed.

Diagnosis Count

Item Description

Compare Error

Recovery Succeeded

The number of recovered compare errors that are detected during the RAID consistency check is displayed.

Recovery Failed

The number of compare errors that are detected during the RAID consistency check, but failed to recover is displayed.

Medium Error

Recovery Succeeded

The number of recovered medium errors that are detected is displayed.

Recovery Failed

The number of medium errors that are detected, but failed to recover is displayed.

CRC Error

Recovery Succeeded

The number of recovered Cyclic Redundancy Code (CRC) errors that are detected is displayed.

CRC error is detected by "Check Code check" performed for the RAID groups of all RAID types. Check Code check verifies the data contents by checking whether the CRC of the Check Code that is added to one block (512 bytes) of user data is the same as the CRC generated from the user data.

Recovery Failed

The number of CRC errors that are detected, but failed to recover is displayed.

Block ID Error

Recovery Succeeded

The number of recovered Block ID errors that are detected is displayed.

Block ID error is detected by "Check Code check" performed for the RAID groups of all RAID types. Check Code check verifies whether the data is received from the user-specified address by checking the Block ID of the Check Code that is added to one block (512 bytes) of user data, RAID ID of the volume, and LBA.

Recovery Failed

The number of Block ID errors that are detected, but failed to recover is displayed.

Bad Data Flag Error

Recovery Succeeded

The number of recovered Bad Data flag errors that are detected is displayed.

Bad Data Flag error is detected when the redundant data stored in the same area of both drives is missing.

Recovery Failed

The number of Bad Data flag errors that are detected, but failed to recover is displayed.

Error Detail Information

The detailed error information is displayed.

Item Description

No.

The number of detailed error information is displayed.

Error Status

The status of the detected error is displayed.

Compare Error

Medium Error

CRC Error

Block ID Error

Bad Data Flag Error

Volume No.

The volume number where the error is detected is displayed.

Note that a "-" (hyphen) is displayed in the following conditions.

  • An error is detected in a TPP that is not assigned to a TPV

  • An error is detected in an FTRP that is not assigned to an FTV

  • The volume where an error is detected cannot be identified

Volume name

The volume name where an error is detected is displayed.

Note that this item is blank in the following conditions.

  • An error is detected in a TPP that is not assigned to a TPV

  • An error is detected in an FTRP that is not assigned to an FTV

  • The volume where an error is detected cannot be identified

CC

A "-" (hyphen) is displayed.

HH

A "-" (hyphen) is displayed.

Logical Volume LBA

The volume LBA where an error is detected is displayed.

Note that a "-" (hyphen) is displayed in the following conditions.

  • An error is detected in a TPP that is not assigned to a TPV

  • An error is detected in an FTRP that is not assigned to an FTV

  • The LBA of the volume where an error is detected cannot be identified

RAID Group LBA

The LBA of the RAID group where an error is detected is displayed.

Error Stripe No.

The stripe number where the error is detected is displayed.

If there is no stripe, such as for RAID1, a "-" (hyphen) is displayed.

Location

The installation location of the drive where an error is detected is displayed.

CE Slot#y

CE#x Slot#y

DE#zz Slot#y

x: CE number

y: Slot number

zz: DE number

Error Drive LBA

The drive LBA where an error is detected is displayed.

Operating Procedures

Start RAID Group Diagnosis

  1. Select the RAID group for which the RAID group diagnosis is to be started (multiple selections can be made) and click [Start Diagnosis] in [Action].

    Caution
    • [Start Diagnosis] cannot be clicked when the following RAID group is selected.

      • The RAID level is "RAID0"

      • The usage is "Extreme Cache Pool"

    • If RAID group diagnosis or disk diagnosis is currently being executed in the storage system, a message to that effect appears.

  2. Select the recovery mode, and click the [Start] button.

    → A confirmation screen appears.

  3. Click the [OK] button.

    → RAID group diagnosis starts, and the [Display RAID Group Diagnosis Information] Screen appears.

    Note

    • Click the [Name] link in the [Display RAID Group Diagnosis Information] screen to display the [Display Detailed RAID Group Diagnosis Information] Screen for the selected RAID group.

    • Click the [Refresh] button in the [Display RAID Group Diagnosis Information] screen to display the latest screen. When the progress rate of the diagnosis becomes "100 %", the diagnosis is regarded as completed.

  4. After the diagnosis is complete, click the [Done] button.

    → A confirmation screen appears.

    Note

    • The [Done] button becomes available when all the RAID group diagnoses are completed or stopped.

  5. Click the [OK] button.

    → Deletion of the RAID group diagnosis results is started.

  6. Click the [Done] button to return to the [RAID Group] screen.

Stop RAID Group Diagnosis

  1. Select the RAID group for which the RAID group diagnosis is to be stopped (multiple selections can be made) from the [Display RAID Group Diagnosis Information] screen and click the [Stop] button.

    → A confirmation screen appears.

  2. Click the [OK] button.

    → The RAID group diagnosis is stopped.

  3. After the process for stopping the diagnosis is complete, the display returns to the [Display RAID Group Diagnosis Information] screen.