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Raid10 Reshape/Grow

DISCUSSION Tim White 3 participants 4 messages Apr 12, 2013 MD RAID

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Tim White

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#0 lore raw

I recently watched Neil's LCA2013 video, and so was wondering if RAID10 reshape/grow is ever going to be implemented?

The way I see it, if we are adding pairs of disks to the RAID10 array (not necessarily the same size as current disks, but the pair being the same size), then we should be able to reshape to grow the RAID10.

From what I can see, the current options are to not use RAID10 if we want to be able to expand later, or to use LVM over RAID1.

I'm obviously not expecting it to be in any distro's yet, but am just wondering what the state of these features are. I have a mdadm git checkout, and am willing to do testing to assist with this.

Thanks

Tim

#1 lore raw

I have outlined strategies to grow raid10 earlier in earlier mails on this list. I think it is doable. Why not try to implement it like that?

Best regards
Keld

Quoted 21 lines · Tim White

I recently watched Neil's LCA2013 video, and so was wondering if RAID10 reshape/grow is ever going to be implemented?

The way I see it, if we are adding pairs of disks to the RAID10 array (not necessarily the same size as current disks, but the pair being the same size), then we should be able to reshape to grow the RAID10.

From what I can see, the current options are to not use RAID10 if we want to be able to expand later, or to use LVM over RAID1.

I'm obviously not expecting it to be in any distro's yet, but am just wondering what the state of these features are. I have a mdadm git checkout, and am willing to do testing to assist with this.

Thanks

Tim
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#2 lore raw
Quoted 2 lines · On Fri, Apr 12, 2013 at 09:17:00AM +0200, [email protected] wrote:

I have outlined strategies to grow raid10 earlier in earlier mails on this list. I think it is doable. Why not try to implement it like that?

Is there a link to Neils video or some presentation notes or some such?

Best regards
keld

Quoted 30 lines

Best regards
Keld

Quoted 14 lines · Tim White

I recently watched Neil's LCA2013 video, and so was wondering if RAID10 reshape/grow is ever going to be implemented?

The way I see it, if we are adding pairs of disks to the RAID10 array (not necessarily the same size as current disks, but the pair being the same size), then we should be able to reshape to grow the RAID10.

From what I can see, the current options are to not use RAID10 if we want to be able to expand later, or to use LVM over RAID1.

I'm obviously not expecting it to be in any distro's yet, but am just wondering what the state of these features are. I have a mdadm git checkout, and am willing to do testing to assist with this.

Quoted 7 lines

Thanks

Tim
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#3 lore raw
Quoted 5 lines · On Fri, 12 Apr 2013 10:42:57 +0200 [email protected] wrote:
Quoted 2 lines · On Fri, Apr 12, 2013 at 09:17:00AM +0200, [email protected] wrote:

I have outlined strategies to grow raid10 earlier in earlier mails on this list. I think it is doable. Why not try to implement it like that?

Is there a link to Neils video or some presentation notes or some such?

both are linked here:

http://blog.neil.brown.name/2013/02/lca-raid/

NeilBrown