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PietdeBoer
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Joined: 20 Oct 2005
Posts: 244
Location: Eindhoven, the Netherlands
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 Posted: Fri May 02, 2008 2:44 pm Post subject: Software raid5 migrate from 3 to 4 disks.. [SOLVED] |
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Hey guys,
Iam running a 3 disk software raid5 array.... holding 3 250GB disks
Now i want to add another 250GB disk... how should i do this? simply add the disk..
i found:
| Code: | mdadm --add /dev/md1 /dev/sdf1
mdadm --grow /dev/md1 --raid-devices=4
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but now should i grow the filesystem as well? without loosing data
thx
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Last edited by PietdeBoer on Sun May 04, 2008 4:05 pm; edited 1 time in total |
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lagalopex
Guru
Joined: 16 Oct 2004
Posts: 562
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| Posted: Fri May 02, 2008 4:08 pm Post subject: Re: Software raid5 migrate from 3 to 4 disks.. |
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| PietdeBoer wrote: | | but now should i grow the filesystem as well? without loosing data |
Yes. Some filesystems will need it to be unmounted, other must be resized mounted.
Though I never tried it because some filesystems can be created optimized for a x-drive raid, that cant be adjusted afterwars... or at least I found no way to  |
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Cyker
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Joined: 15 Jun 2006
Posts: 1746
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| Posted: Sat May 03, 2008 12:04 am Post subject: |
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If you're using ext3 or ext2, this is dead easy 
Once md1 is grown, make sure it's unmounted still, and simply run
resize2fs /dev/md1
And it'll go churn away for a while and at the end you'll have access to all the extra space!  |
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HeissFuss
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Joined: 11 Jan 2005
Posts: 414
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| Posted: Sun May 04, 2008 1:08 am Post subject: |
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| Most file systems allow for online resizing. This works for xfs_growfs, resize_reiserfs, resize2fs, and the jfs remount option. If given no options besides the device, by default they will expand to fill the freespace on the partition. |
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PietdeBoer
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Joined: 20 Oct 2005
Posts: 244
Location: Eindhoven, the Netherlands
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| Posted: Sun May 04, 2008 4:05 pm Post subject: |
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thx this helped me a lot  it worked!
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