[OpenIndiana-discuss] Does the latest OI version allow ashift=12 for zpool creation?

[andy thomas]

What I would like to do is create a new pool with ashift=12 even though 
the current disks have 512 byte/sectors. So when the next disk fails, I 
can get a current model disk with 4k sectors to replace it. Configuring 
ashift sizes at pool creation time can be done in FreeBSD and (I think) in 
ZFSonLinux as well.

Andy

On Tue, 27 Oct 2015, jason matthews wrote:

>
>
>
> If your new drives are misrepresenting their sector size you can override the 
> sector size, thanks to george wilson, in sd.conf. this is common for SSDs.
>
> http://wiki.illumos.org/display/illumos/List+of+sd-config-list+entries+for+Advanced-Format+drives
>
> You can gather the data for the identifying text from iostat -En or format -> 
> select disk -> inquiry
>
> once the zpool created you can verify with zdb -vv <zpool> |grep ashfit
>
>
> j.
>
> On 10/27/15 11:17 AM, andy thomas wrote:
>> I admit I haven't been on this forum for years, such is the reliability of 
>> my OI 148 server built in 2011. I'm using 3 x 2 TB WD2002FAEX 512-byte 
>> sector disks for a ZFS RAIDz1 pool in this and about a year ago, one of 
>> these disks failed - I tried fitting a more recent WD2002 disk with 4k 
>> sectors but zpool replace complained about the sector mismatch and in the 
>> end I had to find another WD2002FAEX (and it was quite expensive too).
>> 
>> This server is now free to be rebuilt so I upgraded it today to OI 151a9 
>> but the latest zpool doesn't seem to offer the option to set the ashift 
>> value. I wondered if I installed the latest OI from DVD, destroying the 
>> original pool, would zpool default to using ashift=12? This would allow me 
>> to use both 512 and 4096 byte sectors in vdevs.
>> 
>> Andy
>> 
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>> 
>
>
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----------------------------
Andy Thomas,
Time Domain Systems

Tel: +44 (0)7866 556626
Fax: +44 (0)20 8372 2582
http://www.time-domain.co.uk