On Mon, Mar 04, 2013 at 03:54:40PM -0700, Steven Crandell wrote: > 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. Hmm, you went from a striped (raid 1/0) log volume on the old hardware to a non-striped (raid 1) volume on the new hardware. That could explain the speed drop. Are the disks the same speed for the two systems? -- -- rouilj John Rouillard System Administrator Renesys Corporation 603-244-9084 (cell) 603-643-9300 x 111 -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
