[lug] Promise Vtrak performance

[Rob Nagler]

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".

> SW raid 1 runs around 50MB/Sec, while HW RAID 1 runs around 60MB/Sec.

I would think these numbers are very hardware dependent.

> 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.

/blob is not the backup partition, obviously.  On the backup partition, du
takes days to run.

Rob
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# /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