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Kevin,
does it matter how the filesystem is mounted?
After all I'm giving ORION a device name called /dev/dsk/c5t0d0s0. Does it matter what/how
a filesystem is mounted on that device?
The /etc/vfstab tells me that the device is mounted like this:
device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
/dev/dsk/c5t0d0s0 /dev/rdsk/c5t0d0s0 /z2 vxfs 2 yes -
- -peter
Kevin Closson wrote:
> Is one buffered and the other not? Perhaps if you mount the 4500
> filesystem with -forcedirectio to see what that does ?
> -----Original Message-----
> From: Peter Santos [mailto:psantos@(protected)]
> Sent: Monday, April 16, 2007 1:25 PM
> To: suse-oracle@(protected)
> Subject: [suse-oracle] Suse 10 vs SUN E4500 - ORION io tool does not
> match iostat output
>
> Folks,
>
> I'm wondering if someone can help me understand the output of oracle's
> ORION I/O calibration tool.
> I'm comparing a SuSE 10 Dell 6800 /IBM DS4400 (4 dual core Xeon 2.60GHz)
> vs Solaris 5.8 E4500/IBM DS4400 (12 x 400Mhz cpus).
>
> Both the devices used are a RAID 10 configuration of 24 x 36GB 15000 rpm
> drives.
>
> I've made sure the controllers are setup the same, and tested only small
> random reads (8k reads).
> The problem I have is that the IOPS rate for the Solaris machine is much
> greater than Suse, but when I compare
> iostat outputs it shows that the SuSe throughput is far better... which
> is what I expect, since the E4500 is a 10yr+
> machine with slower bus speeds.
>
> I'm trying to understand why the results are conflicting, and/or if this
> is just a reporting issue by Orion and/or
> iostat differences between Sun/SuSe. You will notice below that ORION
> reports the IOPS for the Sun test at
> 29,462 vs 2,539, but the iostat output shows differently.
>
> Does anyone have an idea of why the ORION IOPS does not match up with
> the iostat output on the Sun test?
>
> -peter
>
>
>
> iostat on linux
> ===============
>
> Device: r/s rsec/s rkB/s avgrq-sz avgqu-sz await svctm %util
> sde 2519.20 40307.20 20153.60 16.00 55.85 22.10 0.40 99.80
> sde 2527.07 40433.17 20216.58 16.00 56.87 22.52 0.40 99.86
> sde 2535.10 40561.60 20280.80 16.00 56.92 22.47 0.39 99.96
> sde 2534.70 40555.20 20277.60 16.00 56.92 22.37 0.39 99.96
> sde 2534.80 40556.80 20278.40 16.00 56.93 22.51 0.39 99.96
> sde 2539.16 40626.57 20313.29 16.00 59.87 23.49 0.39 99.86
> sde 2523.50 40376.00 20188.00 16.00 56.93 22.45 0.40 99.96
> sde 2508.10 40129.60 20064.80 16.00 58.72 23.47 0.40 99.80
> sde 2517.90 40286.40 20143.20 16.00 59.92 23.79 0.40 99.96
> sde 2528.10 40449.60 20224.80 16.00 59.93 23.71 0.40 99.96
>
> ORION report: Maximum Small IOPS=2539 @ Small=48
>
> iostat on Sun
> ==============
>
> r/s kr/s wait actv asvc_t %w %b device
> 559.4 4475.2 0.0 0.2 0.4 0 22 sd225
> 575.4 4603.2 0.0 0.3 0.4 0 23 sd225
> 568.7 4549.5 0.0 0.2 0.4 0 22 sd225
> 578.9 4631.2 0.0 0.3 0.4 0 23 sd225
> 528.9 4226.5 0.0 0.2 0.4 0 21 sd225
> 537.9 4303.2 0.0 0.2 0.4 0 21 sd225
> 533.4 4267.2 0.0 0.2 0.4 0 21 sd225
> 546.5 4372.0 0.0 0.2 0.4 0 21 sd225
>
>
> ORION report: Maximum Small IOPS=29462 @ Small=48
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