HP 3000 Manuals HP 3000 Manuals
Backing up a mirrored set
Backing up a mirrored volume set consists of the following steps:
1. Splitting the mirrored volume set.
2. Using the STORE command to back up the files.
3. Joining the volume set and starting a repair.
Splitting a mirrored set
This example shows how to perform step 1 of split-volume backup,
splitting a mirrored set.
1. All users of the volume set must initially be logged off before a
split-volume backup can be performed. Notify users of the volume
set that they need to log off.
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NOTE If you do not want to log off the system, make sure that you
are not logged on to the mirrored volume set that you want
to back up. You can use the CHGROUP command to switch to
another volume set.
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| :TELL @ LOGOFF FOR BACKUP |
| |
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2. Use the VSCLOSE command with the SPLIT option to split the volume
set into user volumes and backup volumes.
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NOTE The VSCLOSE command with the SPLIT option can only proceed
if the files in the volume set are not being accessed.
The NOW option of the VSCLOSE command cannot be used with
the SPLIT option.
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3. You can use the DSTAT command to display the split-volume set.
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| :VSCLOSE PROD_SET; SPLIT |
| :DSTAT |
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| LDEV-TYPE STATUS VOLUME (VOLUME SET - GEN) |
| _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 30- 079370 LONER-SU MEMBER1 (PROD_SET-0) |
| 31- 079370 LONER-SB MEMBER1 (PROD_SET-0) |
| 32- 079370 LONER-SU MEMBER2 (PROD_SET-0) |
| 33- 079370 LONER-SB MEMBER2 (PROD_SET-0) |
| |
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Data is unavailable from the time it that takes to complete the
VSCLOSE and VSOPEN. Other than this interval, the files are
continuously accessible to users.
Since the disks are in the LONER state after the VSCLOSE, either
volume set half may be taken offline and used independently of the
other half.
4. Use the VSOPEN command to make the volume set available. Both
user volumes and backup volumes will attempt to be mounted.
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NOTE If either of them has been taken offline, the command only
mounts the available volume set half.
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| :VSOPEN PROD_SET |
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| PROD_SET SPLIT USER VOLUME MOUNTED ON LDEV 32 |
| (AVR 23) |
| |
| PROD_SET SPLIT BACKUP VOLUME MOUNTED ON LDEV 33 |
| (AVR 24) |
| |
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After the volume set is placed online using the VSOPEN command, it
is mounted and available for use.
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NOTE Once a volume set has been taken offline with a VSCLOSE
command, it can only be mounted with a VSOPEN command, not
by bringing it online.
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5. Notify users that the volume set is available.
6. You can use the DSTAT command to display the user volumes (-SU)
and the backup volumes (-SB).
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| :TELL @ SYSTEM IS AVAILABLE NOW |
| :DSTAT |
| |
| LDEV-TYPE STATUS VOLUME (VOLUME SET - GEN) |
| _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 30- 079370 MASTER-SU MEMBER1 (PROD_SET-0) |
| 31- 079370 MASTER-SB MEMBER1 (PROD_SET-0) |
| 32- 079370 MEMBER-SU MEMBER2 (PROD_SET-0) |
| 33- 079370 MEMBER-SB MEMBER2 (PROD_SET-0) |
| |
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Backing up disk files to tape
This example shows how to perform step 2 of split-volume backup, using
the STORE command to back up mirrored disk files to magnetic tape.
1. Use the FILE command to specify that a tape drive will be used as
the output device.
2. Use the STORE command with SPLITVS to start storing the files.
The SHOW option is used to display the files that have been stored
to tape.
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| :FILE T; DEV=TAPE |
| :STORE @.@.@; *T; SPLITVS=PROD_SET; SHOW |
| |
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The tape produced by a split-volume STORE command is fully
compatible with tapes produced from a normal STORE command.
Since the files being backed up are distinct from files on the
user volumes, users can continue to create, modify, or purge files
on the user volumes while the backup is in progress.
The files being backed up remain in the same file state present at
the time the volume set was split.
Joining the volume set
This example shows how to perform step 3 of split-volume backup, joining
the volume set.
1. Use the new VOLUTIL command JOINMIRRSET to join the user and
backup halves of a split volume set to make them mirrored again.
After the volume set is joined, a repair starts using the volumes
that were specified by the source parameter as the source volumes.
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NOTE The SOURCE=USER option is specified so users can continue
accessing the volume set while the join is initiated and the
repair takes place.
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| :VOLUTIL |
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| Mirvutil A.00.00, (C) Hewlett-Packard Co., 1990. |
| All Rights Reserved. |
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| volutil:JOINMIRRSET PROD_SET SOURCE=USER |
| |
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Ideally, all members and partners should be present at the time of
the join. If any of the volumes are unavailable (due to disk or
other errors), some amount of recoverability can be done depending
on the situation. Refer to the "Troubleshooting" chapter in this
manual for more information.
2. Once the volume set has been rejoined a repair, starts to bring
both pairs to a consistent state. You can use the SHOWSET command
to display the disks being repaired.
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| volutil:SHOWSET PROD_SET MIRROR |
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| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER REPAIR-SRCE 30 31 |
| MEMBER1 MASTER REPAIR-DEST 31 30 |
| MEMBER2 MEMBER REPAIR-SRCE 32 33 |
| MEMBER2 MEMBER REPAIR-DEST 33 32 |
| |
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NOTE A maximum of six mirrored pairs can be repaired
simultaneously. If there are more than six mirrored pairs
to be repaired, the repairs are staged. This means that
when one of the six repairs finishes, another begins.
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