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[Veritas-bu] /dev/rmt wierdness
2003-07-31 20:15:36
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I have a problem with my two Mammoth drives. I think this may have
something to do with MP4 being installed.
E450
2GB of RAM
Two Mammoth Drives
All our databases are down
I'm using iostat to watch /dev/rmt/1 and /dev/rmt/0. Now if netbackup is
only writting to one drive is get about 3400-3900KB/Sec. Now if both
drives are being written to i get something like 2009KB/Sec on one drive
and 1984KB/Sec on the other. Then if i go back to writting to a single
drive is get 3400-3900KB/Sec again on the sigle drive.
It doesn't seem to matter which drive it is. To me, this seems to be a
NUMBER_OF_BUFFERS issue, but I have doubled that from 32 to 64 and there
did not seem to be that much of a gain.
SIZE_OF_BUFFERS is set to 64K. Which hasn't caused me problems.
/etc/system has the Veritas shared memory settings combined with our
Progress DB shared mem settings.
here is the output of ipcs -a
IPC status from <running system> as of Thu Jul 31 19:13:30 CDT 2003
T ID KEY MODE OWNER GROUP CREATOR CGROUP
CBYTES QNUM QBYTES LSPID LRPID STIME RTIME CTIME
Message Queues:
q 250 0x4c544952 -Rrw-rw-rw- root other root other
0 0 65536 11126 11105 19:13:27 19:13:27 18:45:39
q 1 0x2 -Rrw-rw-rw- root root root root
0 0 65536 474 390 19:12:48 19:12:48 13:53:21
T ID KEY MODE OWNER GROUP CREATOR CGROUP
NATTCH SEGSZ CPID LPID ATIME DTIME CTIME
Shared Memory:
m 1540 0x5643 --rw-rw-rw- root other root other
1 1024 11116 13874 18:45:36 19:13:19 18:45:36
m 1101 0x5654 --rw-rw-rw- root other root other
1 1024 11116 13874 18:45:36 19:13:19 18:45:36
m 1102 0x4d4e5251 --rw-r--r-- root other root other
3 139264 11105 11341 18:47:37 18:47:37 18:45:39
m 1103 0x55315352 --rw-rw-rw- root other root other
1 4096 11105 11415 18:48:11 18:49:13 18:45:39
m 1104 0x44525354 --rw-r--r-- root other root other
4 393216 11105 13830 19:12:17 19:12:17 18:45:39
m 1105 0x53494152 --rw-r--r-- root other root other
1 1024 11105 11126 18:45:39 18:45:41 18:45:39
m 6 0 --rw-rw-rw- root root root root
1 32805 390 474 19:12:48 19:12:48 13:53:23
m 7 0 --rw-rw-rw- root root root root
1 69666 474 474 13:53:26 no-entry 13:53:26
T ID KEY MODE OWNER GROUP CREATOR CGROUP
NSEMS OTIME CTIME
Semaphores:
s 327680 0x5653 --ra-ra-ra- root other root other
1 19:13:19 18:45:36
s 327682 0x55535253 --ra-ra-ra- root other root other
1 18:48:11 18:45:39
s 3 0x6312 --ra-ra-ra- root root root root
1 19:05:45 13:53:24
Any sugestions?
Thanks,
Karl
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<br><font size=3>I have a problem with my two Mammoth drives. I think this
may have something to do with MP4 being installed.</font>
<br>
<br><font size=3>E450</font>
<br><font size=3>2GB of RAM</font>
<br><font size=3>Two Mammoth Drives</font>
<br>
<br><font size=3>All our databases are down</font>
<br>
<br><font size=3>I'm using iostat to watch /dev/rmt/1 and /dev/rmt/0. Now
if netbackup is only writting to one drive is get about 3400-3900KB/Sec.
Now if both drives are being written to i get something like 2009KB/Sec
on one drive and 1984KB/Sec on the other. Then if i go back to writting
to a single drive is get 3400-3900KB/Sec again on the sigle drive.</font>
<br>
<br><font size=3>It doesn't seem to matter which drive it is. To me, this
seems to be a NUMBER_OF_BUFFERS issue, but I have doubled that from 32
to 64 and there did not seem to be that much of a gain.</font>
<br>
<br><font size=3>SIZE_OF_BUFFERS is set to 64K. Which hasn't caused me
problems.</font>
<br>
<br><font size=3>/etc/system has the Veritas shared memory settings combined
with our Progress DB shared mem settings.</font>
<br>
<br><font size=3>here is the output of ipcs -a</font>
<br>
<br><font size=3>IPC status from <running system> as of Thu Jul 31
19:13:30 CDT 2003</font>
<br><font size=3>T ID KEY
MODE OWNER
GROUP CREATOR CGROUP CBYTES QNUM QBYTES LSPID
LRPID STIME RTIME CTIME</font>
<br><font size=3>Message Queues:</font>
<br><font size=3>q 250 0x4c544952 -Rrw-rw-rw-
root other root other
0 0 65536 11126 11105 19:13:27
19:13:27 18:45:39</font>
<br><font size=3>q 1 0x2
-Rrw-rw-rw- root root
root root 0 0 65536
474 390 19:12:48 19:12:48 13:53:21</font>
<br><font size=3>T ID KEY
MODE OWNER
GROUP CREATOR CGROUP NATTCH SEGSZ
CPID LPID ATIME DTIME CTIME</font>
<br><font size=3>Shared Memory:</font>
<br><font size=3>m 1540 0x5643
--rw-rw-rw- root other root
other 1 1024 11116 13874
18:45:36 19:13:19 18:45:36</font>
<br><font size=3>m 1101 0x5654
--rw-rw-rw- root other root
other 1 1024 11116 13874
18:45:36 19:13:19 18:45:36</font>
<br><font size=3>m 1102 0x4d4e5251 --rw-r--r--
root other root other
3 139264 11105 11341 18:47:37 18:47:37
18:45:39</font>
<br><font size=3>m 1103 0x55315352 --rw-rw-rw-
root other root other
1 4096 11105 11415 18:48:11 18:49:13
18:45:39</font>
<br><font size=3>m 1104 0x44525354 --rw-r--r--
root other root other
4 393216 11105 13830 19:12:17 19:12:17
18:45:39</font>
<br><font size=3>m 1105 0x53494152 --rw-r--r--
root other root other
1 1024 11105 11126 18:45:39 18:45:41
18:45:39</font>
<br><font size=3>m 6 0
--rw-rw-rw- root
root root root 1
32805 390 474 19:12:48 19:12:48 13:53:23</font>
<br><font size=3>m 7 0
--rw-rw-rw- root
root root root 1
69666 474 474 13:53:26 no-entry 13:53:26</font>
<br><font size=3>T ID KEY
MODE OWNER
GROUP CREATOR CGROUP NSEMS OTIME
CTIME</font>
<br><font size=3>Semaphores:</font>
<br><font size=3>s 327680 0x5653 --ra-ra-ra-
root other root other
1 19:13:19 18:45:36</font>
<br><font size=3>s 327682 0x55535253 --ra-ra-ra-
root other root other
1 18:48:11 18:45:39</font>
<br><font size=3>s 3 0x6312
--ra-ra-ra- root root
root root 1 19:05:45 13:53:24</font>
<br>
<br><font size=3>Any sugestions?</font>
<br>
<br><font size=3>Thanks,</font>
<br>
<br><font size=3>Karl</font>
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