[OpenIndiana-discuss] Will mixing 4K drives and non 4K drives in a storage pool work properly?

Reginald Beardsley pulaskite at yahoo.com
Fri Mar 27 21:59:29 UTC 2015

This has been widely discussed.  You will have to rebuild the pool with ashift=12.  So far as I know there is no way to do that on an existing pool.

The general incantation is to create a new pool big enough to hold your data, copy the data to the new pool, destroy the old pool and then add the old disks to the new pool.  You'd probably be best in the long run buying a new set of 2 or 3 TB disks for whatever level of redundancy you want  

I built a system w/ a 4 way mirror  rpool in a small slice on 2 TB disks with a RAIDZ2 pool on the 4 big slices.  Unfortunately you can't do that w/ EFI label disks yet.  I've got a similar setup on another system except it's a 3 way mirror rpool and 3 disk RAIDZ1 with a bare 3 TB scratch disk.

You can't boot from RAIDZ, so that was my solution.  On the HP N40/54L boxes, using a flash drive for a single image rpool seems to be a popular approach to working around not being able to boot from RAIDZ.

A lot depends upon what your requirements are.

Have Fun!

On Fri, 3/27/15, Robin Axelsson <gu99roax at student.chalmers.se> wrote:

 Subject: [OpenIndiana-discuss] Will mixing 4K drives and non 4K drives in a	storage pool work properly?
 To: "Discussion list for OpenIndiana" <openindiana-discuss at openindiana.org>
 Date: Friday, March 27, 2015, 3:52 PM
 I have a system with a bunch of 1.5TB
 drives running oi_151a5. One of
 the drives is failing and needs replacement. The problem is
 that new
 1.5TB drives are no longer available on the market.
 Now, all drives are non-4K sector drives. The largest non-4K
 available are the 1TB drives which obviously are too small.
 So the only viable option for me is to go with 2TB drives
 which are 4K
 drives. Will such a replacement drive work together with the
 non-4K drives without hiccups and performance issues?
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