I'd be more interested in the random results from bonnie++ but my real world experience tells me that for heavily parallel writes etc a RAID-10 will stomp a RAID-6 or RAID-60 on the same number of drives. On Mon, Mar 4, 2013 at 4:47 PM, Steven Crandell <steven.crandell@xxxxxxxxx> wrote: > Mark, > I ran pg_fsync_test on log and data LV's on both old and new hardware. > > New hardware out performed old on every measurable on the log LV > > Same for the data LV's except for the 16kB open_sync write where the old > hardware edged out the new by a hair (18649 vs 17999 ops/sec) > and write, fsync, close where they were effectively tied. > > > > > On Mon, Mar 4, 2013 at 4:17 PM, John Rouillard <rouilj@xxxxxxxxxxx> wrote: >> >> 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 > > -- To understand recursion, one must first understand recursion. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
