Re-size RAID-10
I think I asked this once before, if so I apologize for the redundancy - but then again maybe something's changed...
I've got a RAID-10 array with four drives. It's nearing capacity, and I need to explore expansion options. Can I simply add a pair of new drives? Or do I have to archive the information first and rebuild the array from scratch?
Signature · 1 line
Daniel
Quoted 7 lines · On Wednesday March 25, [email protected] wrote:
I think I asked this once before, if so I apologize for the redundancy - but then again maybe something's changed...
I've got a RAID-10 array with four drives. It's nearing capacity, and I need to explore expansion options. Can I simply add a pair of new drives? Or do I have to archive the information first and rebuild the array from scratch?
It is not currently possible to resize a raid-10.
NeilBrown
Neil Hello
I will be grateful for your reply. Currently I am working on raid0 code reshape.
1. Will you be working on this functionality in the near future ?
2. Should I save the superblocks like mdadm does in the case of 1,4,5,6 ?
3. What is the heuristics of strip_zones ? why do we need them ?
. non-power 2 raid0 chunk sizes.
4. Other than segments masks issues, why isn't possible ? can't i fix raid0 to support 3MB chunks with a segment of 1MB ?
Thank you
Quoted 9 lines · Neil Brown
Quoted 7 lines · On Wednesday March 25, [email protected] wrote:
I think I asked this once before, if so I apologize for the redundancy - but then again maybe something's changed...
I've got a RAID-10 array with four drives. It's nearing capacity, and I need to explore expansion options. Can I simply add a pair of new drives? Or do I have to archive the information first and rebuild the array from scratch?
Quoted 9 lines
It is not currently possible to resize a raid-10.
NeilBrown
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Quoted 10 lines · Neil Brown
Quoted 7 lines · On Wednesday March 25, [email protected] wrote:
I think I asked this once before, if so I apologize for the redundancy - but then again maybe something's changed...
I've got a RAID-10 array with four drives. It's nearing capacity, and I need to explore expansion options. Can I simply add a pair of new drives? Or do I have to archive the information first and rebuild the array from scratch?
It is not currently possible to resize a raid-10.
In my mind, it should not be that difficult, tho, to do it.
Is resize an operation that needs to be done with the fs unmounted?
best regards
keld
2009/3/26 Keld Jørn Simonsen <[email protected]>:
Quoted 10 lines · Neil Brown
Quoted 9 lines · On Wednesday March 25, [email protected] wrote:
Quoted 7 lines
I think I asked this once before, if so I apologize for the redundancy - but then again maybe something's changed...
I've got a RAID-10 array with four drives. It's nearing capacity, and I need to explore expansion options. Can I simply add a pair of new drives? Or do I have to archive the information first and rebuild the array from scratch?
Quoted 5 lines
Quoted 1 line
It is not currently possible to resize a raid-10.
In my mind, it should not be that difficult, tho, to do it.
Is resize an operation that needs to be done with the fs unmounted?
No. in raid5 there is no need for that.
Quoted 8 lines
best regards
keld--
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Quoted 4 lines · On Thursday March 26, [email protected] wrote:
Neil Hello
I will be grateful for your reply. Currently I am working on raid0 code reshape.
1. Will you be working on this functionality in the near future ?
I have no plans for raid0 reshape or raid10 reshape.
Quoted 1 line
2. Should I save the superblocks like mdadm does in the case of 1,4,5,6 ?
When the layout changes, you certainly have to update the superblock, yes.
Quoted 1 line
3. What is the heuristics of
strip_zones? why do we need them ?
To make maximum use of available space.
Quoted 4 lines
. non-power 2 raid0 chunk sizes.
4. Other than segments masks issues, why isn't possible ? can't i fix raid0 to support 3MB chunks with a segment of 1MB ?
There is no intrinsic reason why chunk sizes should be powers of two. When I started working on the code that limit already existed and I have never had any reason to remove it.
If you would like to create patches which provide support for non-power-of-two chunk sizes, I will be happy to review them.
NeilBrown