On 3/05/2012 7:07 a.m., Gordon Ross wrote:
On Wed, May 2, 2012 at 2:47 PM, Richard Elling
<richard.ell...@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
One day this low level disk stuff will get into this millenium.
I see my CDC Wren IV 94171-327 museum exhibit still rates a mention :)
Mark.
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