HP 3000 Manuals HP 3000 Manuals
Disk failures
The following disk failures will now be described along with their
recovery procedures:
* Drives that do not mount at system start.
* Drives that are disabled after they have mounted.
Disk mounting failure
The system automatically mounts a mirrored volume set after volumes have
been added to a mirrored volume set, upon power on of the disk drive or
the boot of the system.
When a mirrored volume set is mounted, it is possible that one or more
mirrored partners may be missing or not responding.
Example: If a disk does not mount.
This example shows how to recover from a disk that did not mount.
1. If LDEV 32's partner did not mount, LDEV 32 is placed in the
PENDING state and a console message is displayed to alert you of
this condition.
If the partner of LDEV 32 comes online, it is recognized;
otherwise, the message displays every thirty seconds.
2. Reply to the (Y/N)? question to stop it from repeating.
__________________________________________________________________________
| |
| |
| ?09:09/12/MIRRORED PARTNER MISSING FOR LDEV# 32 |
| |
| ?09:09/22/ACKNOWLEDGE MIRRORED PARTNER MISSING FOR LDEV# 32(Y/N)? |
| |
| :REPLY 22,Y |
| |
__________________________________________________________________________
3. You will not be able to access MEMBER2 due to the PENDING state of
one of its disks until you do one of the following:
a. Power on the missing partner (if the drive had previously
been powered off).
b. Issue the SUSPENDMIRRVOL command to place the PENDING disk
in the SUSPEND-MIRR state and make it accessible without
mirroring.
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NOTE Issuing the SUSPENDMIRRVOL command does not stop the
repeating message. Your reply stops the message.
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4. Use the DSTAT command to verify that LDEV 32's partner did not
mount.
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| |
| |
| :DSTAT |
| |
| LDEV-TYPE STATUS VOLUME (VOLUME SET - GEN) |
| _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 30- 079370 MASTER-MD MEMBER1 (PROD_SET-0) |
| 31- 079370 MASTER-MD MEMBER1 (PROD_SET-0) |
| 32- 079370 *PENDING-MD MEMBER2 (PROD_SET-0) |
| |
____________________________________________________________
The previous screen shows that MEMBER2 is waiting (PENDING) for
the mount of its partner (which is not even listed). The MEMBER2
volume remains in the PENDING state and remains unavailable until
you issue the SUSPENDMIRRVOL command to override and tell the
system to proceed without mirroring on that volume.
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NOTE The SUSPENDMIRRVOL command can only be issued on a disk in
the PENDING state.
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5. Use the VOLUTIL SUSPENDMIRRVOL command to access the MEMBER2
volume without mirroring.
_______________________________________________________________________________
| |
| |
| :VOLUTIL |
| |
| Mirvutil A.00.00, (C) Hewlett-Packard Co., 1990. All Rights Reserved. |
| |
| volutil:SUSPENDMIRRVOL PROD_SET:MEMBER2 32 |
| |
| *Verify:SUSPEND THE MIRROR PENDING VOLUME ON LDEV 32 [Y/N]?Y |
| |
_______________________________________________________________________________
_________________________________________________________________
CAUTION Care must be taken when using SUSPENDMIRRVOL to ensure
that the PENDING disk is good. This command forces the
system to mount and use this drive. Because of drive
errors, it may not have been possible to mark the drive
as bad. The drive could contain data that has not been
updated. This could lead to application errors and force
a reload of the volume set.
_________________________________________________________________
6. After you have suspended a mirrored volume, use the SHOWSET
command with the MIRROR parameter to verify that the volume can be
accessed and is in the SUSPEND-MIRR state.
_______________________________________________________________
| |
| |
| volutil:SHOWSET PROD_SET MIRROR |
| |
| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER NORMAL 30 31 |
| MEMBER1 MASTER NORMAL 31 30 |
| MEMBER2 MEMBER SUSPEND-MIRR 32 * |
| |
_______________________________________________________________
The previous screen shows that the MEMBER2 volume is available and
does not have a mirrored partner.
7. Check the disk that did not mount to see if it was powered on.
Once the disk has been repaired by either physically replacing the
drive or fixing the disk problem, power on the disk.
Example: Replacing a disk that did not mount.
This example shows how to replace a disk that did not mount at system
start.
1. Use the DSTAT command to verify that the new volume can be
initialized (SCRATCH or UNKNOWN status). If you need to scratch
the volume and it does not contain any data that you want to save,
use the SCRATCHVOL command.
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NOTE The new volume must be mounted in the SCRATCH or UNKNOWN
state. It does not need to have the same LDEV or I/O path
as the disk that did not mount.
_________________________________________________________________
____________________________________________________________
| |
| |
| volutil: :DSTAT |
| |
| LDEV-TYPE STATUS VOLUME (VOLUME SET - GEN) |
| _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 30- 079370 MASTER-MD MEMBER1 (PROD_SET-0) |
| 31- 079370 MASTER-MD MEMBER1 (PROD_SET-0) |
| 32- 079370 MEMBER-MD MEMBER2 (PROD_SET-0) |
| 33- 079370 SCRATCH |
| |
____________________________________________________________
_________________________________________________________________
NOTE If the new volume mounts in the PENDING state, do not issue
the SUSPENDMIRRVOL command on the new volume. Disk
mirroring cannot work properly if both partners of a
mirrored pair are placed in the SUSPEND-MIRR state.
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2. Use the REPLACEMIRRVOL command to initialize LDEV 33 as the new
mirrored disk partner of LDEV 32.
____________________________________________________
| |
| |
| volutil: REPLACEMIRRVOL PROD_SET:MEMBER2 33 |
| |
____________________________________________________
The system now recognizes (mounts) the replaced volume, resumes
disk mirroring, and starts the repair process.
3. Use the SHOWSET command to verify that MEMBER2 is under repair.
______________________________________________________________
| |
| |
| volutil: SHOWSET PROD_SET MIRROR |
| |
| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER NORMAL 30 31 |
| MEMBER1 MASTER NORMAL 31 30 |
| MEMBER2 MEMBER REPAIR-SRCE 32 33 |
| MEMBER2 MEMBER REPAIR-DEST 33 32 |
| |
______________________________________________________________
The above screen shows that LDEV 33 (REPAIR-DEST) is being
repaired by LDEV 32 (REPAIR-SRCE). Programs and data residing on
MEMBER2 are available while repairs are taking place.
Disk failure after mounting
The system automatically recovers from a failure of a single disk that is
a partner of a mirrored pair during normal mirrored operation. Normal
mirrored operation means that both partners are fully mounted and no
repair operation is taking place.
A drive can fail and be marked DISABLED in the following ways:
Errors being The drive is marked as having failed
returned (DISABLED) immediately, and the
application continues to use the remaining
drive in the NON-MIRROR state.
Drive not There is a slight delay (less than two
responding minutes) while the system waits for the
drive to respond. During this waiting
period, processes performing I/O will be
suspended. If the drive responds before
the timeout, normal mirroring resumes. If
the drive does not respond, the drive is
marked as having failed (DISABLED), and
the application continues to use the
remaining drive in the NON-MIRROR state.
Example: If a disk fails after mounting.
This example shows how to recover from a disk that failed after mounting.
1. If LDEV 32 fails, a console message alerts you of this condition.
_______________________________________________________
| |
| |
| ?09:09/12/MIRRORED VOLUME DISABLED ON LDEV# 32 |
| |
_______________________________________________________
The system automatically continues the application without
mirroring and places the good disk in the NON-MIRROR state. The
following message displays every thirty seconds, asking you to
acknowledge this condition.
2. Your reply stops the repeating message on the console. It causes
no other action to take place.
__________________________________________________________________________
| |
| |
| ?09:09/22/ACKNOWLEDGE MIRRORED VOLUME DISABLED ON LDEV# 32 [Y/N]? |
| :REPLY 22,Y |
| |
__________________________________________________________________________
_________________________________________________________________
NOTE The repeating message continues until a reply is given -
even if the drive is replaced.
_________________________________________________________________
3. Use the DSTAT command to show that LDEV 32 has failed and is no
longer available.
____________________________________________________________
| |
| |
| :DSTAT |
| |
| LDEV-TYPE STATUS VOLUME (VOLUME SET - GEN) |
| _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 30- 079370 MASTER-MD MEMBER1 (PROD_SET-0) |
| 31- 079370 MASTER-MD MEMBER1 (PROD_SET-0) |
| 32- 079370 *DISABLED-MD MEMBER2 (PROD_SET-0) |
| 33- 079370 MEMBER-MD MEMBER2 (PROD_SET-0) |
| |
____________________________________________________________
4. Use the SHOWSET command to confirm that LDEV 32 is disabled and
that LDEV 33 is functioning in a NON-MIRROR state.
______________________________________________________________
| |
| |
| :VOLUTIL |
| |
| Mirvutil A.00.00, (C) Hewlett-Packard Co., 1990. |
| All Rights Reserved. |
| |
| volutil:SHOWSET PROD_SET MIRROR |
| |
| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER NORMAL 30 31 |
| MEMBER1 MASTER NORMAL 31 30 |
| MEMBER2 MEMBER DISABLED 32 33 |
| MEMBER2 MEMBER NON-MIRROR 33 32 |
| |
______________________________________________________________
Example: Replacing a disabled disk.
This example shows how to replace a disk in the DISABLED state.
1. Use the DSTAT command to verify that the new volume mounts in the
DISABLED state and has the same LDEV as the previous volume that
was disabled.
______________________________________________________________
| |
| |
| :VOLUTIL |
| |
| Mirvutil A.00.00, (C) Hewlett-Packard Co., 1990. |
| All Rights Reserved. |
| |
| volutil:SHOWSET PROD_SET MIRROR |
| |
| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER NORMAL 30 31 |
| MEMBER1 MASTER NORMAL 31 30 |
| MEMBER2 MEMBER DISABLED 32 33 |
| MEMBER2 MEMBER NON-MIRROR 33 32 |
| |
______________________________________________________________
_________________________________________________________________
NOTE When replacing a volume in the DISABLED state, you must use
the same LDEV number and I/O path as the failed disk. Any
volume mounted on that LDEV mounts in the DISABLED state and
is available as the target of the REPLACEMIRRVOL command.
_________________________________________________________________
2. Use the REPLACEMIRRVOL command to replace LDEV 32 and resume
mirroring (after the repair).
____________________________________________________
| |
| |
| volutil: REPLACEMIRRVOL PROD_SET:MEMBER2 32 |
| |
____________________________________________________
The system now recognizes (mounts) the replaced volume, resumes
disk mirroring, and starts the repair process. The replacement
volume has the same characteristics specified when the disabled
volume was first initialized using the NEWMIRRVOL or NEWMIRRSET
commands.
_________________________________________________________________
NOTE REPLACEMIRRVOL always initiates an immediate repair (no
staging), even if the maximum number of repairs is already
taking place.
If the destination drive fails or is not responding during a
repair operation, it is marked DISABLED, and the source
drive returns to the NON-MIRROR state.
_________________________________________________________________
3. You can use the SHOWSET command to verify that MEMBER2 is under
repair.
_______________________________________________________________
| |
| |
| volutil: SHOWSET PROD_SET MIRROR |
| |
| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER NORMAL 30 31 |
| MEMBER1 MASTER NORMAL 31 30 |
| MEMBER2 MEMBER REPAIR-SRCE 32 33 |
| MEMBER2 MEMBER REPAIR-DEST 33 32 |
| |
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