From: Bob Gautier <rgautier@redhat.com>
To: consult-list@redhat.com, dm-devel@redhat.com
Subject: dm-multipath has great throughput but we'd like more!
Date: Thu, 18 May 2006 08:05:28 +0100 [thread overview]
Message-ID: <1147935929.27006.57.camel@baggage> (raw)
Yesterday my client was testing of multipath load balancing and failover
on a system running ext3 on a logical volume which comprises about ten
SAN LUNs all reached using multipath in multibus mode over two QL2340
HBAs.
On the one hand, the client is very impressed: running bonnie++
(inspired by Ronan's GFS v VxFS example) we get just over 200Mbyte/s
over the two HBAs, and when we pull a link we get about 120MByte/s.
The throughput and failover response times are better than the client
has ever seen, but we're wondering why we are not seeing higher
throughput per-HBA -- the QL2340 datasheet says it should manage
200Mbyte/s and all switches etc. run at 2GBps.
Any ideas?
Bob Gautier
+44 7921 700996
next reply other threads:[~2006-05-18 7:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-18 7:05 Bob Gautier [this message]
2006-05-18 7:19 ` [Consult-list] dm-multipath has great throughput but we'd like more! Bob Gautier
2006-05-18 7:27 ` Luca Berra
2006-05-18 7:36 ` Jonathan E Brassow
2006-05-18 7:44 ` Luca Berra
2006-05-18 7:25 ` Jonathan E Brassow
2006-05-18 7:44 ` Bob Gautier
2006-05-18 7:55 ` Jonathan E Brassow
2006-05-18 7:59 ` Luca Berra
2006-05-18 8:04 ` [Consult-list] " Nicholas C. Strugnell
2006-05-18 9:42 ` Nicholas C. Strugnell
2006-05-18 10:28 ` Richard Keech
2006-05-22 15:31 ` Ed Wilts
2006-05-18 20:28 ` Steve Lord
2006-05-18 17:00 ` [Consult-list] " Rod Nayfield
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