Bob Friesenhahn wrote:
On Wed, 15 Jul 2009, Scott Lawson wrote:
NAME STATE READ WRITE
CKSUM
test1 ONLINE 0
0 0
mirror ONLINE 0
0 0
c3t600A0B80005622640000039B4A257E11d0 ONLINE 0
0 0
c3t600A0B8000336DE2000004394A258B93d0 ONLINE 0
0 0
Each of these LUNS is a pair of 146GB 15K drives in a RAID1 on Crystal
firmware on a 6140. Each LUN is 2km
apart in different data centres. 1 LUN where the server is, 1 remote.
Interestingly by creating the mirror vdev the first run got faster, and
the second much much slower. The second cpio
took and extra 2 minutes by virtue of it being a mirror. I ran the
script once again prior to adding the mirror
and the results were pretty much the same as the first run posted. (plus
or minus a couple of seconds, which
is to be expected as these LUNS are on prod arrays feeding other servers
as well)
I will try these tests on some of my J4500's when I get a chance
shortly. My interest is now piqued.
Doing initial (unmount/mount) 'cpio -C 131072 -o > /dev/null'
48000256 blocks
real 3m25.13s
user 0m2.67s
sys 0m28.40s
It is quite impressive that your little two disk mirror reads as fast
as mega Sun systems with 38+ disks and striped vdevs to boot. Incredible!
Does this have something to do with your well-managed power and
cooling? :-)
Maybe it is Bob, maybe it is. ;) haha.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us,
http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
