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Date: Mon, 7 Jul 2008 14:46:28 -0400 (EDT)
From: Justin Piszcz <jpiszcz@...idpixels.com>
To: linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
xfs@....sgi.com
cc: Alan Piszcz <ap@...arrain.com>
Subject: Re: 12 Veliciraptors again w/x4 card (1.1gbytes/sec aggregate
read)!
On Mon, 7 Jul 2008, Justin Piszcz wrote:
>
>
> On Mon, 7 Jul 2008, Justin Piszcz wrote:
>
>> Each PCI-e x1 card has 1 veliciraptor on it now.
>> Got an x4 card wit 4 sata ports:
>>
>> Not quite the > 1 gbyte/sec I was hoping for in regards to the reads
>> but pretty close!
>
> Going to remove one of the drives from the x1 card and put it on the x4
> card instead, then I will use all 4 SATA ports on the x4 and hopefully get
> better bw.
>
Four drives on the x4 card, MAX bandwidth for every disk.
p34:~# dd if=/dev/sdi of=/dev/null bs=1M &
[1] 4720
p34:~# dd if=/dev/sdj of=/dev/null bs=1M &
[2] 4721
p34:~# dd if=/dev/sdk of=/dev/null bs=1M &
[3] 4722
p34:~# dd if=/dev/sdl of=/dev/null bs=1M &
[4] 4723
p34:~#
120MiB/s per each one!
Re-running dd test with all 12 disks:
1.1 gigabytes per second read!
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 120 59104 6632220 52228 0 0 0 40 168 517 0 0 100 0
0 0 120 59104 6632220 52228 0 0 0 0 20 291 0 0 100 0
3 10 120 43516 6635576 51924 0 0 1051776 62 4221 12301 1 70 11 19
6 9 160 44420 6634720 51788 0 0 1117284 0 4435 12308 1 75 5 19
6 9 160 47436 6631100 51676 0 0 1110300 0 4449 11438 1 76 3 20
2 10 160 46740 6632048 51948 0 0 1137920 0 4447 12251 1 75 8 17
9 7 160 45248 6632056 52004 0 8 1127940 45 4559 13259 1 74 9 17
3 9 160 44152 6634780 49960 0 0 1132032 12 4471 12962 0 75 8 16
4 9 160 44160 6634960 49380 0 0 1129216 8 4430 12545 0 76 7 16
After:
About the same for write:
$ dd if=/dev/zero of=bigfile.1 bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 20.4056 s, 526 MB/s
'nuff said for read :)
$ dd if=bigfile.1 of=/dev/null bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 10.2841 s, 1.0 GB/s
Justin.
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