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Would seem to me that your bottleneck is somewhere else, maybe the file
system (are you backing up lots of small files, slow disk ??)
looks like you get about the same throughput from one drive as two, maybe
the delivery cannot get faster....
cheers
--
Dr Jerry Vochteloo
Senior Education Consultant
Veritas Software
Level 14, 207 Kent Street
Sydney, NSW, 2000
w: +61-2-8220-7043, m: 0408 206 748
The opinions stated here are mine and do not necessarily represent those of
VERITAS Software Corp
-----Original Message-----
From: Karl.Rossing AT Federated DOT CA [mailto:Karl.Rossing AT Federated DOT CA]
Sent: Friday, 1 August 2003 10:16 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] /dev/rmt wierdness
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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<DIV><SPAN class=199300407-18082003><FONT face=Arial color=#0000ff size=2>Would
seem to me that your bottleneck is somewhere else, maybe the file system (are
you backing up lots of small files, slow disk ??)</FONT></SPAN></DIV>
<DIV><SPAN class=199300407-18082003><FONT face=Arial color=#0000ff size=2>looks
like you get about the same throughput from one drive as two, maybe the
delivery
cannot get faster....</FONT></SPAN></DIV>
<DIV><SPAN class=199300407-18082003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=199300407-18082003><FONT face=Arial color=#0000ff
size=2>cheers</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT size=2>--<BR>Dr Jerry Vochteloo<BR>Senior Education
Consultant<BR>Veritas Software<BR>Level 14, 207 Kent Street<BR>Sydney, NSW,
2000<BR>w: +61-2-8220-7043, m: 0408 206 748<BR><BR>The opinions stated here are
mine and do not necessarily represent those of VERITAS Software
Corp<BR></FONT></P>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Karl.Rossing AT Federated
DOT CA
[mailto:Karl.Rossing AT Federated DOT CA]<BR><B>Sent:</B> Friday, 1 August
2003 10:16
AM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B>
[Veritas-bu] /dev/rmt wierdness<BR><BR></FONT></DIV><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></BLOCKQUOTE></BODY></HTML>
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