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Replies:
2
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Last Post:
Aug 11, 2006 3:04 PM
by: rang
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Posts:
86
From:
FI
Registered:
6/23/05
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Proposal expand raidz
Posted:
Aug 11, 2006 10:31 AM
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Greetings
Have used zfs raidz for while and question rised is it possible to expand raidz with additional disks.
Got answer pool yes but raidz "group" no.
So very high level idea for you , maybe already know.
And i'm not detail level expert of zfs so here might be "trivial" things for you.
So could add operation enhanced so that it allow to add additional disks/devices to raidz.
some criterias : larger or equal with current pool devices
i assume tricky part is how to make that new device into use.
how about every write is pointed to all devices and while read is only "previous"
or brute force during add process write every file again using all devices.
i know in NetApp Filers this allready works , so i think this is just finding way how to make it work in zfs raidz
Thanks for your time
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Posts:
21
From:
Registered:
7/25/06
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Re: Proposal expand raidz
Posted:
Aug 11, 2006 11:05 AM
in response to: homerun
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Just a data point -- our netapp filer actually creates additional raid groups that are added to the greater pool when you "add disks", much as zfs does now. They aren't simply used to expand
the one large raid group of the volume. I've been meaning to rebuild the whole thing to
get use of the multiple parity disks back.
Ours is a few years old and isn't running the latest software rev, so maybe they've overcome
this now, but thought I'd mention it.
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Posts:
294
From:
Mendota Heights, Minnesota, USA
Registered:
3/9/05
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Re: Proposal expand raidz
Posted:
Aug 11, 2006 3:04 PM
in response to: bplecs
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That's the default, I think, but you can use 'vol add -g' to add disks to an existing RAID group. This is fairly new functionality (V6.2 I think). ZFS will probably not take so long to add this feature. :-)
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