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Re: 12 Veliciraptors again w/x4 card (~1gbyte/sec aggregate read)!

To: linux-kernel@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Subject: Re: 12 Veliciraptors again w/x4 card (~1gbyte/sec aggregate read)!
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Mon, 7 Jul 2008 14:37:31 -0400 (EDT)
In-reply-to: <alpine.DEB.1.10.0807071424100.4694@xxxxxxxxxxxxxxxx>
References: <alpine.DEB.1.10.0807071424100.4694@xxxxxxxxxxxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
User-agent: Alpine 1.10 (DEB 962 2008-03-14)


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.

If you look at 7,8,9 there is little improvement: (PCI-e x1)

7 VR
  2  6    160  46744 6599020  44688    0    0 748204    17 3042 9084  0 34 40 26
  3  6    160  46592 6598824  44372    0    0 747520     8 2975 9047  1 33 31 36
8 VR
  2  7    160  46512 6598612  44580    0    0 761184    16 3089 9937  0 36 40 24
  2  7    160  44528 6600392  44360    0    0 759720     8 2993 9522  0 36 36 28
9 VR
  2  8    160  47152 6596824  44572    0    0 767016     0 3075 9730  1 37 39 24
  2  7    160  46576 6597728  44688    0    0 771200     0 3032 9568  0 37 40 23

But once I hit the drives on the x4 card, vroom vroom!

10 VR
  0 10    160  45048 6598240  44428    0    0 889072     8 3599 11561  0 47 20 
33
  2 10    160  45232 6598116  44772    0    0 890112     0 3495 11547  0 46 23 
31
11 VR
  4  8    160  45536 6594716  44600    0    0 996352     0 3947 12134  1 62 13 
25
  2  9    160  45348 6594912  44096    0    0 1009152     0 3949 11949  0 63 10 
28
12 VR
  6  8    160  45092 6583136  47016    0    0 1063200     0 4187 12394  1 71  9 
21
  3 11    160  47080 6578492  47588    0    0 1058412     0 4224 12547  1 72  8 
20


Justin.


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