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lothar
Tux's lil' helper
Joined: 10 Mar 2004
Posts: 87
Location: Norway
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 Posted: Mon Jul 14, 2008 3:10 pm Post subject: Question about shrinking a reiserfs partition on LVM2 |
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Hi.
I've got a 750GB HD that I'd like to remove from one LVM Volume Group and add to my raid5 array.
What do I need to do first?
First resize (shrink) the filesystem with resize_reiserfs, then shrink the LV with lvextend, and finally use pvmove to move all data from the HD to free space in the Volume Group?
Just want to be on the safe side, so I thought I'd ask before I do it.
I've got a raid5 array consisting of 4x750GB disks, now I should be able to add the disk with this commands:
| Code: | mdadm --add /dev/md3 /dev/sdx1
mdadm --grow /dev/md3 -n 5
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Does this look right?
This raid5 array is quite important, so I don't want to loose data.
If this is unsafe to do I just have to live with the 4x750 array I've got today. |
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frostschutz
Advocate
Joined: 22 Feb 2005
Posts: 2977
Location: Germany
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| Posted: Mon Jul 14, 2008 4:30 pm Post subject: |
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http://tldp.org/HOWTO/LVM-HOWTO/removeadisk.html
If you need to shrink it first, yes, you first shrink the filesystem, then you shrink the partition. For growing it would be the other way around, first grow the partition, then grow the filesystem.
If you shrink the partition before shrinking the filesystem, you cut off the end of the filesystem. If you grow the filesystem before growing the partition, you grow into nowhere.
Not sure about the commands you need for adding to raid - I don't use raid. |
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