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Filesystem Reduction?
- Thread starter Roomer
- Start date
I've used both procedures below many times without a problem. Good luck!
If there is not enough free space on the disk(s) to have both filesystems allocated, use the first procedure...
1. Backup to a tape drive if one is available. Use the backup command.
monkey:root:/#> /usr/sbin/backup -f/dev/rmt0 -0 /usr/local
2. Unmount and remove the filesystem. (Verify your backup first)
monkey:root:/#> umount /usr/local
monkey:root:/#> rmfs /usr/local
3. Recreate your logical volume and file system with the smaller size.
monkey:root:/#> mklv -y hd99 -t jfs rootvg 24 hdisk0
or use SMIT: 'smitty mklv' to create your logical volume and
'smitty crjfslvstd' to create your smaller jfs filesystem on top of the previously created logical volume.
4. Mount your filesystem.
monkey:root:/#> mount /dev/hd99
5. Restore from you tape backup
monkey:root:/#> /usr/sbin/restore -rq -f/dev/rmt0 -d/ -v
or use the 'smitty restfilesys' fastpath.
|----------|-----------|----------|-----------|----------|
|----------|-----------|----------|-----------|----------|
Secondly:
BTW, if you are not mirrored you should ignore the first step and Step 8.
The process assumes that you have a moderate size JFS filesystem on hdisk2, and a mirrored copy on hdisk3:
1. Break mirrors:
rmlvcopy fslv.old 1 hdisk2
2. Create new filesystem (fs.new) on free hdisk at a smaller size:
smitty lv
Create the fs.newlv:
smitty fs
Create the JFS fs.new:
mount fs.newlv
3. tar fs.old to buffer, and untar to target fs.new without tmpfile:
cd /fs.old
This tar command has the potential to destroy existing data in the event of typographical errors. It is recommended to precede it with a # to comment it out, then recall and check for accuracy prior to actual execution:
#tar -cvf - .|(cd /fs.new;tar -xvpf -)
tar -cvf - .|(cd /fs.new;tar -xvpf -)
4. Check the results to ensure the copy was correct:
ls -alR /fs.old > fsold
ls -alR /fs.new > fsnew
diff fsold fsnew (should be none of note)
5. Reorg filesystem:
umount /fs.old
umount /fs.new
chfs -m fs.old.flag fs.old (rename orig fs.old to fs.old.flag)
This changes the mountpoint of the old filesystem freeing the original:
chfs -m fs.old fs.new (rename new fs to old fs name)
This changes the mountpoint of the new filesystem to the original one:
mount /fs.old.flag
mount /fs.old (The new smaller JFS is here now)
6. Check the results to ensure correct copy:
ls -alR /fs.old fsold2
diff fsold fsold2 (should be none of note)
7. When assured that both filesystems are the same, remove original filesystem:
umount /fs.old.flag
rmfs -r fs.old.flag
8. Remirror the new, smaller filesystem:
mklvcopy -k fs.oldlv 2 hdisk3
9. End up with:
/dev/fs.newlv /fs.old
10. Rename the lv and complete the switch:
umount fs.oldlv
chlv -n fs.oldlv fs.newlv
remount
mount /dev/fs.oldlv
11. The change is now complete, and you should see a smaller sized JFS with the old name and mount point:
/dev/fs.oldlv /fs.old
If there is not enough free space on the disk(s) to have both filesystems allocated, use the first procedure...
1. Backup to a tape drive if one is available. Use the backup command.
monkey:root:/#> /usr/sbin/backup -f/dev/rmt0 -0 /usr/local
2. Unmount and remove the filesystem. (Verify your backup first)
monkey:root:/#> umount /usr/local
monkey:root:/#> rmfs /usr/local
3. Recreate your logical volume and file system with the smaller size.
monkey:root:/#> mklv -y hd99 -t jfs rootvg 24 hdisk0
or use SMIT: 'smitty mklv' to create your logical volume and
'smitty crjfslvstd' to create your smaller jfs filesystem on top of the previously created logical volume.
4. Mount your filesystem.
monkey:root:/#> mount /dev/hd99
5. Restore from you tape backup
monkey:root:/#> /usr/sbin/restore -rq -f/dev/rmt0 -d/ -v
or use the 'smitty restfilesys' fastpath.
|----------|-----------|----------|-----------|----------|
|----------|-----------|----------|-----------|----------|
Secondly:
BTW, if you are not mirrored you should ignore the first step and Step 8.
The process assumes that you have a moderate size JFS filesystem on hdisk2, and a mirrored copy on hdisk3:
1. Break mirrors:
rmlvcopy fslv.old 1 hdisk2
2. Create new filesystem (fs.new) on free hdisk at a smaller size:
smitty lv
Create the fs.newlv:
smitty fs
Create the JFS fs.new:
mount fs.newlv
3. tar fs.old to buffer, and untar to target fs.new without tmpfile:
cd /fs.old
This tar command has the potential to destroy existing data in the event of typographical errors. It is recommended to precede it with a # to comment it out, then recall and check for accuracy prior to actual execution:
#tar -cvf - .|(cd /fs.new;tar -xvpf -)
tar -cvf - .|(cd /fs.new;tar -xvpf -)
4. Check the results to ensure the copy was correct:
ls -alR /fs.old > fsold
ls -alR /fs.new > fsnew
diff fsold fsnew (should be none of note)
5. Reorg filesystem:
umount /fs.old
umount /fs.new
chfs -m fs.old.flag fs.old (rename orig fs.old to fs.old.flag)
This changes the mountpoint of the old filesystem freeing the original:
chfs -m fs.old fs.new (rename new fs to old fs name)
This changes the mountpoint of the new filesystem to the original one:
mount /fs.old.flag
mount /fs.old (The new smaller JFS is here now)
6. Check the results to ensure correct copy:
ls -alR /fs.old fsold2
diff fsold fsold2 (should be none of note)
7. When assured that both filesystems are the same, remove original filesystem:
umount /fs.old.flag
rmfs -r fs.old.flag
8. Remirror the new, smaller filesystem:
mklvcopy -k fs.oldlv 2 hdisk3
9. End up with:
/dev/fs.newlv /fs.old
10. Rename the lv and complete the switch:
umount fs.oldlv
chlv -n fs.oldlv fs.newlv
remount
mount /dev/fs.oldlv
11. The change is now complete, and you should see a smaller sized JFS with the old name and mount point:
/dev/fs.oldlv /fs.old
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