[lug] Promise Vtrak performance

[George Sexton]

Rob Nagler wrote:
> On 11/25/07, George Sexton wrote:
>> It would be more helpful if instead of saying performance was abysmal,
>> you gave us some numbers out of a benchmark program like bonnie++.
> 
> I did say "hours" and "days" to run "du".

Sorry. Took the days part as hyperbole.

> 
>> SW raid 1 runs around 50MB/Sec, while HW RAID 1 runs around 60MB/Sec.
> 
> I would think these numbers are very hardware dependent.

Yup. These are numbers that I got off of a system that I own. SW RAID 
numbers are using the integrated ICH7R controller, and HW RAID is the 
3Ware 9550U-4LP in a 133MHz PCI slot.

So, the HW raid is maybe 1/3rd again faster (actually the numbers were 
47MB versus 63MB). The CPU utilization was virtually identical.

> 
>> What is yours doing?
> 
> I couldn't get bonnie++ to compile on RH7.2, and I can't move the Vtrak to a
> RHEL4.5 system right now.
> 
> Here's my own benchmark. /blob is the Vtrak.  /usr is on a PERC3 with
> 10K SCSI RAID10.  du /usr runs 42 faster than du /blob when cached,
> and uncached 10.6x faster.  Even though the system time on du /usr is
> twice as much than du /blob.  See results below.

Something still doesn't seem right. Are you sure the array is healthy 
and not running in degraded mode?


> 
> /blob is not the backup partition, obviously.  On the backup partition, du
> takes days to run.
> 
> Rob
> ------------------------------------------------------------------------------------------------
> 
> # /usr/bin/time du /blob > /dev/null
> 0.01user 0.28system 1:25.97elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (138major+58minor)pagefaults 0swaps
> # /usr/bin/time du /blob > /dev/null
> 0.01user 0.19system 0:26.73elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (138major+59minor)pagefaults 0swaps
> # /usr/bin/time du /blob > /dev/null
> 0.03user 0.18system 0:25.02elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (138major+58minor)pagefaults 0swaps
> # /usr/bin/time du /usr > /dev/null
> 0.08user 0.48system 0:09.10elapsed 6%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (138major+97minor)pagefaults 0swaps
> # /usr/bin/time du /usr > /dev/null
> 0.05user 0.47system 0:00.60elapsed 86%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (138major+96minor)pagefaults 0swaps
> # /usr/bin/time du /usr > /dev/null
> 0.14user 0.35system 0:00.58elapsed 84%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (138major+96minor)pagefaults 0swaps
> # df -i
> Filesystem            Inodes   IUsed   IFree IUse% Mounted on
> /dev/sda3            35569664   81714 35487950    1% /
> /dev/sdd1            1430592   18601 1411991    2% /blob
> # df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/sda3            280046492   1515812 264305124   1% /
> /dev/sdd1            1952811400  40832356 1911979044   3% /blob
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