[OpenIndiana-discuss] Hitachi 4 TB disks + HP Microserver + OI 151 + ZFS

[Gordon Ross]

On Wed, May 2, 2012 at 3:07 PM, Gordon Ross <gordon.w.ross at gmail.com> wrote:
> On Wed, May 2, 2012 at 2:47 PM, Richard Elling
> <richard.elling at richardelling.com> wrote:
>> On May 2, 2012, at 12:25 AM, Mark wrote:
>>
>>> There are two issues.
>>>
>>> The first is correct partition alignment, the second ashift value.
>>>
>>> In "theory", I haven't tested this yet, manually creating the slices with a start position to sector 64 and using slices instead of whole disks for the zpool devices, and creating with an ashift of 12 may produce the desired outcome.
>>
>> Default starting offset for slice 0 is sector 256 for 512-byte sector disks.
>> You shouldn't have to manually touch these unless you are running an
>> ancient (circa 2006-2007) version of Solaris where the default offset was 34.
>
> Yes, but be warned: the format command will try to make fdisk partitions
> that are aligned on "cyninder" boundaries, which are usually odd numbers
> of sectors.  I have a fix for that here:  http://yalms.org/cr/zfs-blksize/
> (the first three files.  ignore the zfs part for now)
>
> Gordon

For those interested, I have a review out for this work on illumos-dev.
http://www.yalms.org/cr/illumos-2949/
Please comment over there.

Thanks,
-- 
Gordon Ross <gwr at nexenta.com>
Nexenta Systems, Inc.  www.nexenta.com
Enterprise class storage for everyone