Simon Banton wrote:
At 17:34 +0800 14/9/07, Feizhou wrote:
.oh....do you have a BBU for your write cache on your 3ware board?
Not installed, but the machine's on a UPS.
Ugh. The 3ware code will not give OK then until the stuff has hit disk.
Having now installed BBUs, it's made no difference to the underlying
responsiveness problem I'm afraid.
So a 3ware card will give OK once the stuff is in the cache and you have
selected write-cache enable even if there is no BBU? My apologies. My
previous experience has been with the 75xx and 85xx series which do not
have ram caches.
With ports 2 and 3 now configured as RAID 0, with ext3 filesystem and
mounted on /mnt/raidtest, running this bonnie++ command:
bonnie++ -m RA-256_NR-8192 -n 0 -u 0 -r 4096 -s 20480 -f -b -d
/mnt/raidtest
(RA- and NR- relate to kernel params for readahead and nr_requests
respectively - the values above are Centos post-installation defaults)
...causes load to climb:
16:36:12 up 13 min, 2 users, load average: 8.77, 4.78, 1.98
... and uninterruptible processes:
ps ax | grep D
PID TTY STAT TIME COMMAND
59 ? D 0:03 [kswapd0]
2159 ? D 0:01 [kjournald]
2923 ? Ds 0:00 syslogd -m 0
4155 ? D 0:00 [pdflush]
4175 ? D 0:00 [pdflush]
4192 ? D 0:00 [pdflush]
4193 ? D 0:00 [pdflush]
4197 ? D 0:00 [pdflush]
4199 ? D 0:00 [pdflush]
4201 pts/1 R+ 0:00 grep D
... plus an Out of Memory kill of sshd. Second time around (logged in on
the console rather than over ssh), it's just the same except it's hald
that happens to get clobbered instead.
Are you saying that running in RAID0 mode with this card and motherboard
combination, you get a memory leak? Who is the culprit?
Now that the presence or otherwise of a BBU has been ruled out along
with OS, 3ware recommended kernel param tweaks, RAID level, LVM, slot
speed, different but identical-spec hardware (both machine and card),
what's left to try?
Bug report...
I see there's a new firmware version out today (3ware codeset 9.4.1.3 -
driver's still at 2.26.05.007 but the fw's updated to from 3.08.02.005
to 3.08.02.007), so I guess I'll update it and push the whole thing back
up the hill for another go.
I hope that fixes things for you.
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