Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi guys,
We've got a bit of a problem at a customer site and I was wondering if
anybody had any suggestions. With drbd up and running on both the
primary and backup, massive amounts of data were copied over to the
relevant mount points on the primary. Apparently this slowed the
machine down so much (haven't yet been able to get from them if it was
the CPU usage or memory) that users were getting kicked off. When drbd
was taken down on the backup, then everything was o.k. They started
with drbd version 0.7.13. I perused the archives of this mailing list
and found something which suggested that this was a problem fixed after
0.7.13, so they upgraded to 0.7.19 and are still having the problem.
Parameters we've thought might be appropriate in the drbd.conf file are
protocol (using protocol A: I'm sure this is fine), sndbuf-size
(warnings using large values like 1M), max-buffers (this looks promising
to me), max-epoch-size, and maybe rate. I'm a bit nervous about
changing anything, so does anybody have some good ideas?
Appropriate environmental information such as proc/drbd and system info
is below:
Thanks,
Tim
-----------------------------------------------------------------
Output from /proc/drbd
smb-mtl01:~ # cat /proc/drbd
version: 0.7.19 (api:78/proto:74)
SVN Revision: 2212 build by root at smb-mtl01, 2006-06-13 10:56:44
0: cs:Connected st:Primary/Secondary ld:Consistent
ns:0 nr:0 dw:2112 dr:209304 al:522 bm:0 lo:0 pe:0 ua:0 ap:0
1: cs:Connected st:Primary/Secondary ld:Consistent
ns:32 nr:0 dw:352 dr:86220 al:3 bm:2 lo:0 pe:0 ua:0 ap:0
2: cs:Connected st:Primary/Secondary ld:Consistent
ns:32 nr:0 dw:1632 dr:123328 al:393 bm:3 lo:0 pe:0 ua:0 ap:0
smb-sjo01:~ # cat /proc/drbd
version: 0.7.19 (api:78/proto:74)
SVN Revision: 2212 build by root at smb-sjo01, 2006-06-12 14:55:54
0: cs:Connected st:Secondary/Primary ld:Consistent
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0
1: cs:Connected st:Secondary/Primary ld:Consistent
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0
2: cs:Connected st:Secondary/Primary ld:Consistent
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0
------------------------------------------------------------------
Machine 1: (primary, I believe)
Link speed: 10 MBps (T1 line)
1 NIC 100 MB/s.
SuSe 9
Hardware Configuration:
Manufactured by IBM (iSeries) running on top of AS/400 810.
Has 1 CPU at 1GHz.
Memory is 1024 MB.
200 GB disk
Machine 2:
Also SuSE 9.
Same IBM running on iSeries.
1 CPU at 1 GHz.
512 MB memory.
150 GB disk space.
1 NIC at 10 MB/s
Replicating about 100 GB of data.
Tim Johnson
Senior Software Engineer
Vision Solutions, Inc.
17911 Von Karman Ave, 5th Floor
Irvine, CA 92614
UNITED STATES
Tel: +1 (949) 253-6528
Fax: +1 (949) 225-0287
Email: tjohnson at visionsolutions.com
<http://www.visionsolutions.com/>
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