DL380 Gen3 HP SmartArray 5i 64mb.
Raid 5 Array: 4x 36Gb 10k Ultra320:
/dev/cciss/c0d0:
Timing cached reads: 784 MB in 2.00 seconds = 392.13 MB/sec
Timing buffered disk reads: 240 MB in 3.01 seconds = 79.78 MB/sec
Raid 1 Array: 2x 146gb 10k Ultra320:
/dev/cciss/c0d1:
Timing cached reads: 850 MB in 2.00 seconds = 424.73 MB/sec
Timing buffered disk reads: 210 MB in 3.00 seconds = 69.97 MB/sec
----- Original Message -----
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
To: "Mitch Kelly" <mitchkelly@xxxxxxxxxxxxxx>; "Sami Dalouche"
<skoobi@xxxxxxx>; "Javier Guerra" <javier@xxxxxxxxxxx>
Cc: "Xen Users" <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Saturday, January 26, 2008 2:13 PM
Subject: RE: [Xen-users] Xen Disk I/O performance vs native performance
Subject: Re: [Xen-users] Xen Disk I/O performance vs native
performance
Im curious, What PC do you have? Im running a Compaq DL380 and get
crap
Profomace at the moment.
What sort of DL380, and what sort of disks?
I've got a DL385 with 146G 10K 2.5" SAS disks on a HP RAID controller,
and hdparm -tT /dev/cciss/c0d0 gives me around 900MB/sec for cached
reads, and around 235MB/sec for buffered reads.
hdparm -tT on an lv used in DomU, with hdparm being run from Dom0 gives
me about the same for cached reads, but only 60MB/sec for buffered
reads.
hdparm -tT on the same lv under DomU gives me 35-50MB/sec.
So I'm getting a pretty drastic performance hit from lvm (never noticed
that before... guess I should look into it... maybe it's an artefact of
hdparm) and a small hit from xen blockfront/back.
James
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