svn commit: r232901 - head/usr.sbin/pc-sysinstall/backend
Alexander Motin
mav at FreeBSD.org
Tue Mar 13 07:20:01 UTC 2012
On 03/12/12 23:41, Josh Paetzel wrote:
> Author: jpaetzel
> Date: Mon Mar 12 21:41:29 2012
> New Revision: 232901
> URL: http://svn.freebsd.org/changeset/base/232901
>
> Log:
> Use gpart "-a" flag to 4k alignment.
>
> Submitted by: kris
> Obtained from: PC-BSD
>
> Modified:
> head/usr.sbin/pc-sysinstall/backend/functions-bsdlabel.sh
> head/usr.sbin/pc-sysinstall/backend/functions-disk.sh
>
> Modified: head/usr.sbin/pc-sysinstall/backend/functions-bsdlabel.sh
> ==============================================================================
> --- head/usr.sbin/pc-sysinstall/backend/functions-bsdlabel.sh Mon Mar 12 21:34:10 2012 (r232900)
> +++ head/usr.sbin/pc-sysinstall/backend/functions-bsdlabel.sh Mon Mar 12 21:41:29 2012 (r232901)
> @@ -314,7 +314,7 @@ setup_gpart_partitions()
> if [ "$CURPART" = "2" ] ; then
> # If this is GPT, make sure first partition is aligned to 4k
> sleep 2
> - rc_halt "gpart add -b 2016 ${SOUT} -t ${PARTYPE} ${_pDisk}"
> + rc_halt "gpart add -a 4k ${SOUT} -t ${PARTYPE} ${_pDisk}"
> else
> sleep 2
> rc_halt "gpart add ${SOUT} -t ${PARTYPE} ${_pDisk}"
Just to note: if neither -b, nor -a is specified, gpart should now use
stripe size/offset values provided by GEOM. So, for example, if
partition is created on top of GEOM_STRIPE with 64K strip size, gpart
would automatically align to that value. Forcing 4K alignment is a
safety measure in case if device with 4K sectors wasn't detected as
such, but it can be a pessimization for devices with stripes bigger then 4K.
--
Alexander Motin
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