Here's our hardware break down. The logvg on the new hardware is 30MB/s slower (170 MB/s vs 200 MB/s ) than the logvg on the older hardware which was an immediately interesting difference but we have yet to be able to create a test scenario that successfully implicates this slower log speed in our problems. That is something we are actively working on.
Old server hardware: Manufacturer: Dell Inc. Product Name: PowerEdge R810 4x Intel(R) Xeon(R) CPU E7540 @ 2.00GHz 32x16384 MB 1066 MHz DDR3 Controller 0: PERC H700 - 2 disk RAID-1 278.88 GB rootvg Controller 1: PERC H800 - 18 disk RAID-6 2,178.00 GB datavg, 4 drive RAID-10 272.25 GB logvg, 2 hot spare 2x 278.88 GB 15K SAS on controller 0 24x 136.13 GB 15K SAS on controller 1 New server hardware: Manufacturer: Dell Inc. Product Name: PowerEdge R820 4x Intel(R) Xeon(R) CPU E5-4620 0 @ 2.20GHz 32x32 GB 1333 MHz DDR3 Controller 0: PERC H710P - 4 disk RAID-6 557.75 GB rootvg Controller 1: PERC H810 - 20 disk RAID-60 4,462.00 GB datavg, 2 disk RAID-1 278.88 GB logvg, 2 hot spare 28x278.88 GB 15K SAS drives total. On Sun, Mar 3, 2013 at 1:34 PM, Jean-David Beyer <jeandav...@verizon.net>wrote: > On 03/03/2013 03:16 PM, Josh Berkus wrote: > > Steven, > > > >> We saw the same performance problems when this new hardware was running > >> cent 6.3 with a 2.6.32-279.19.1.el6.x86_64 kernel and when it was > matched > >> to the OS/kernel of the old hardware which was cent 5.8 with > >> a 2.6.18-308.11.1.el5 kernel. > > > > Oh, now that's interesting. We've been seeing the same issue (IO stalls > > on COMMIT) ond had attributed it to some bugs in the 3.2 and 3.4 > > kernels, partly because we don't have a credible "old server" to test > > against. Now you have me wondering if there's not a hardware or driver > > issue with a major HW manufacturer which just happens to be hitting > > around now. > > > > Can you detail your hardware stack so that we can compare notes? > > > > > The current Red Hat Enterprise Linux 6.4 kernel is > kernel-2.6.32-358.0.1.el6.x86_64 > > in case that matters. > > > -- > Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance >