At 12:50 PM 12/15/2008, Paul MacKenzie wrote:
> Any suggestions on where to look next? Are there obvious candidates?
After weeks of working on this I now believe that anything that taxes
the writing to the hard drives causes the system CPU numbers to spike
through the roof (approx 80% usage) and the server grinds to a halt. And
I also see wide swings in the System CPU usage. It reminds me of the
QUOTA issue I had with 6.2 where the system usage was really high and it
was the QUOTA code that was broken.
Hi,
I dont have a box in the lab I can test a lot with right
now, but I do have a couple of these cards in customer servers and
write performance seems ok
This is an AMD64 box, 8G RAM
7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #2: Tue Sep 23 09:25:02 EDT 2008
running a lot of postgres queries right now
[ns8]# dd if=/dev/zero of=/var/tmp/test count=1000 bs=1024k
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 10.265211 secs (102148508 bytes/sec)
[ns8]#
which seems reasonable for raw write performance.
If you bring up the little Areca web app, are there any errors about
the array? When you created the raid sets, what params did you use ?
The above is on
Volume Capacity 320.0GB
SCSI Ch/Id/Lun 0/0/0
Raid Level Raid 1+0
Stripe Size 64KBytes
Block Size 512Bytes
Member Disks 4
Cache Mode Write Back
Tagged Queuing Enabled
Volume State Normal
[ns8]# vmstat -i
interrupt total rate
irq4: sio0 57065 0
irq17: em1 3989494045 554
irq18: arcmsr0 558098657 77
cpu0: timer 14381393929 2000
irq256: em0 22763077 3
cpu1: timer 14381384902 1999
Total 33333191675 4635
[ns8]#
arcmsr0: <Areca SATA Host Adapter RAID Controller
> mem 0xe8600000-0xe8600fff,0xe8000000-0xe83fffff irq 18 at device
14.0 on pci2
ARECA RAID ADAPTER0: Driver Version 1.20.00.15 2007-10-07
ARECA RAID ADAPTER0: FIRMWARE VERSION V1.43 2007-4-17
arcmsr0: [ITHREAD]
.....
Waiting 5 seconds for SCSI devices to settle
(probe16:arcmsr0:0:16:0): inquiry data fails comparison at DV1 step
da0 at arcmsr0 bus 0 target 0 lun 0
da0: <Areca ARC-1210-VOL#00 R001> Fixed Direct Access SCSI-5 device
da0: 166.666MB/s transfers (83.333MHz DT, offset 32, 16bit)
da0: 305175MB (624999424 512 byte sectors: 255H 63S/T 38904C)
SMP: AP CPU #1 Launched!
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