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Possible to replace zpool drive using shift 9 with drive using shift 12?

B

bbzidane

n00b
Joined
Dec 22, 2002
Messages
40
I had a zpool with 3TB Hitachi drives, using shift 9. Two of the drives are showing issues and I would like to replace it with 4TB Hitach drives. When I try to do so, it says "devices have different sector alignment".

Can I still replace the old 3TB drives with the new 4TB drives, or am I out of luck and need to buy some more hdds?

I'm using nappit on omnios

Thanks.
 
The ashift is a property of the pool and has in principle nothing to do with the HDDs themselves. The logical sector size of all current desktop HDDs should be 512 byte and should work as a replacement. A drive with a 4096 byte physical sectors will just work with reduced performance in an ashift=9 pool. The ashift cannot be changed, you would have to create a new pool for that.

I have not used napp-it, but if it prevents you from just adding the drive, you should be able to somehow circumvent this warning.
 
ashift property is actually per vdev not per pool. You can have different ashift vdevs in the same zpool. But yeah, you can't change it.
 
Well, it is good to know - I have never used more than one vdev. I would rather add a new pool for my use cases, it just gives more flexibility.
 
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