On 03/05/2012 03:10, Jan Nielsen wrote:
300GB
RAID10 2x15k drive for OS on local storage
*/dev/sda1
RA*
4096
*/dev/sda1
FS* ext4
*/dev/sda1 MO*
600GB RAID
10 8x15k drive for $PGDATA on SAN
*IO Scheduler
sda* noop anticipatory deadline [cfq]
*/dev/sdb1
RA* 4096
*/dev/sdb1
FS* xfs
*/dev/sdb1 MO* allocsize=256m,attr2,logbufs=8,logbsize=256k,noatime
300GB RAID 10 2x15k drive for $PGDATA/pg_xlog on SAN
*IO
Scheduler sdb* noop anticipatory deadline [cfq]
*/dev/sde1
RA* 4096
*/dev/sde1 FS*
xfs
*/dev/sde1
MO* allocsize=256m,attr2,logbufs=8,logbsize=256k,noatime
*
I was wondering if it would be better to put the xlog on the same
disk as the OS? Apart from the occasional log writes I'd have
thought most OS data is loaded into cache at the beginning, so you
effectively have an unused disk. This gives you another spindle
(mirrored) for your data.
Or have I missed something fundamental?
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