* (unknown),
@ 2002-12-28 1:25 TJ
2002-12-28 12:39 ` RAID5 reconfig Marco Shaw
0 siblings, 1 reply; 6+ messages in thread
From: TJ @ 2002-12-28 1:25 UTC (permalink / raw)
To: linux-raid
Do the current raidtools allow enlarging a RAID 5 array by adding more disks
to it without initializing a new
array? This feature is found in some hardware raid controllers.
Even if the array must be taken down and processed while offline by a
utility, this would be greatly
appreciated.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: RAID5 reconfig
@ 2002-12-28 16:43 TJ
2003-01-20 0:19 ` Jakob Oestergaard
0 siblings, 1 reply; 6+ messages in thread
From: TJ @ 2002-12-28 16:43 UTC (permalink / raw)
To: linux-raid
> Use with extreme care:
> http://unthought.net/raidreconf/index.shtml
> Someone posted a success story on this list a few weeks ago using a
> pretty big RAID5 volume/array.
> Marco
> PS: Please use the 'Subject' field.
Sorry about that.. Please CC me, I don't seem to be getting any feed from
the list.
Thanks for the link. I've been reading up on others experiences and
documentation seems somewhat thin. Does a mini-HOWTO exist anywhere?
From what I've read, first raidreconf is used to change the array, then
fsck -f is run to check the product, then the file system resize utility
must be used to change the size of the filesystem on the RAID array. Then it
would probably be a good idea to run fsck -f once more. This should be
sufficient to add more disks to a RAID 5 array and enlarge the filesystem to
take advantage of the larger block device. Am I missing anything?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: RAID5 reconfig
2002-12-28 16:43 TJ
@ 2003-01-20 0:19 ` Jakob Oestergaard
2003-01-20 3:16 ` TJ
0 siblings, 1 reply; 6+ messages in thread
From: Jakob Oestergaard @ 2003-01-20 0:19 UTC (permalink / raw)
To: TJ; +Cc: linux-raid
On Sat, Dec 28, 2002 at 11:43:25AM -0500, TJ wrote:
> > Use with extreme care:
> > http://unthought.net/raidreconf/index.shtml
>
> > Someone posted a success story on this list a few weeks ago using a
> > pretty big RAID5 volume/array.
>
> > Marco
>
> > PS: Please use the 'Subject' field.
>
> Sorry about that.. Please CC me, I don't seem to be getting any feed from
> the list.
>
> Thanks for the link. I've been reading up on others experiences and
> documentation seems somewhat thin. Does a mini-HOWTO exist anywhere?
> >From what I've read, first raidreconf is used to change the array, then
> fsck -f is run to check the product, then the file system resize utility
> must be used to change the size of the filesystem on the RAID array. Then it
> would probably be a good idea to run fsck -f once more. This should be
> sufficient to add more disks to a RAID 5 array and enlarge the filesystem to
> take advantage of the larger block device. Am I missing anything?
Only that in some scenarios raidreconf fails horribly - this seems to at
least happen if you have hot spares configured.
Make sure you have a good backup. Please report success/failure to the
list - that is greatly appreciated :)
--
................................................................
: jakob@unthought.net : And I see the elder races, :
:.........................: putrid forms of man :
: Jakob Østergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: RAID5 reconfig
2003-01-20 0:19 ` Jakob Oestergaard
@ 2003-01-20 3:16 ` TJ
2003-01-20 3:48 ` Scott McDermott
0 siblings, 1 reply; 6+ messages in thread
From: TJ @ 2003-01-20 3:16 UTC (permalink / raw)
To: Jakob Oestergaard; +Cc: linux-raid
Well, raidreconfig worked wonderfully for me, however I screwed up
afterwards. I fscked before resize2fs, but forgot to do it again afterwards
and mounted the filesystem and used it. That caused it enough damage that I
damaged it and rebuilt it from backups. Raidreconfig worked excellently. It
handled unequal partition sizes just fine, though running it with the --test
flag returned an error that one partition was too small (0kb).
One feature request:
Go from 4 40gb disks in RAID 5 to 3 80gb devices in RAID 5: 1 80 gb disk and
the 4 40gb drives in RAID 0.
Old raidtab:
raiddev /dev/md0
raid-level 0
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda4
raid-disk 0
device /dev/hdc1
raid-disk 1
New raidtab:
raiddev /dev/md0
raid-level 5
nr-raid-disks 4
chunk-size 128k
persistent-superblock 1
parity-algorithm left-symmetric
nr-spare-disks 0
device /dev/hda4
raid-disk 0
device /dev/hdb1
raid-disk 1
device /dev/hdc1
raid-disk 2
device /dev/hdd1
raid-disk 3
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-01-20 3:48 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2002-12-28 1:25 (unknown), TJ
2002-12-28 12:39 ` RAID5 reconfig Marco Shaw
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2002-12-28 16:43 TJ
2003-01-20 0:19 ` Jakob Oestergaard
2003-01-20 3:16 ` TJ
2003-01-20 3:48 ` Scott McDermott
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