Re: Benchmark: Dell/Perc 6, 8 disk RAID 10 - Mailing list pgsql-performance

All,
I am in the process of specing out a purchase for our production systems, and am looking at the Dell 2950s as well. I am very interested to see where this thread goes, and what combinations work with different application loading types. Our systems will have one pair of heartbeat-controlled, drbd mirrored servers running postgresql 8.3, with a more write intensive, multiple writers and few readers application. The other similarly configured pair will have lots of readers and few writers. Our initial plan is RAID 10 for the database (four 300GB 15K drives in an attached MD1000 box) and RAID 1 for the OS (pair of 73GB drives internal to the 2950). PERC 6i for the internal drives (256MB battery backed cache), PERC 6E for the external drives (512MB battery backed cache). 8GB RAM, also dual Gig NICs for internet and heartbeat/drbd. Not sure which processor we're going with, or if 8GB memory will be enough. Keep the benchmarks coming.

Doug

On Thu, 2008-03-13 at 04:11 -0400, Justin Graf wrote:

I recent just got a new server also from dell 2 weeks ago
went with more memory slower CPU, and smaller harddrives
 have not run pgbench

Dell PE 2950 III
2 Quad Core 1.866 Ghz
16 gigs of ram.
8 hard drives 73Gig 10k RPM SAS
2 drives in Mirrored for OS, Binaries, and WAL
6 in a raid 10
Dual Gig Ethernet
OS Ubuntu 7.10
-----------------------------------------------

Version 1.03
                     ------Sequential Output------ --Sequential Input- --Random-
                       -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size        K/sec %CP  K/sec   %CP    K/sec %CP   K/sec %CP K/sec    %CP /sec %CP
PriData 70000M  51030   90   107488    29      50666 10     38464 65     102931     9    268.2 0

------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
PriData,70000M,51030,90,107488,29,50666,10,38464,65,102931,9,268.2,0,16,
+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++

the difference in our results are interesting.

What are the setting on the RAID card .  I have the cache turned on with Read Ahead 


---- Message from Craig James <craig_james@emolecules.com> at 03-12-2008 09:55:18 PM ------

I just received a new server and thought benchmarks would be interesting.  I think this looks pretty good, but maybe there are some suggestions about the configuration file.  This is a web app, a mix of read/write, where writes tend to be "insert into ... (select ...)" where the resulting insert is on the order of 100 to 10K rows of two integers.  An external process also uses a LOT of CPU power along with each query.

Thanks,
Craig


Configuration:
  Dell 2950
  8 CPU (Intel 2GHz Xeon)
  8 GB memory
  Dell Perc 6i with battery-backed cache
  RAID 10 of 8x 146GB SAS 10K 2.5" disks

Everything (OS, WAL and databases) are on the one RAID array.

Diffs from original configuration:

max_connections = 1000
shared_buffers = 400MB
work_mem = 256MB
max_fsm_pages = 1000000
max_fsm_relations = 5000
wal_buffers = 256kB
effective_cache_size = 4GB

Bonnie output (slightly reformatted)

------------------------------------------------------------------------------

Delete files in random order...done.
Version  1.03
         ------Sequential Output------       --Sequential Input-      --Random-
      -Per Chr-   --Block--    -Rewrite-     -Per Chr-   --Block--    --Seeks--
 Size K/sec %CP   K/sec  %CP   K/sec  %CP    K/sec %CP   K/sec  %CP    /sec %CP
  16G 64205  99   234252  38   112924  26    65275  98   293852  24   940.3   1

         ------Sequential Create------    --------Random Create--------
      -Create--   --Read---   -Delete--   -Create--   --Read---   -Delete--
files  /sec %CP    /sec %CP    /sec %CP    /sec %CP    /sec %CP    /sec %CP
   16 12203  95   +++++ +++   19469  94   12297  95   +++++ +++   15578  82

www.xxx.com,16G,64205,99,234252,38,112924,26,65275,98,293852,24,940.3,1,16,12203,95,+++++,+++,19469,94,12297,95,+++++,+++,15578,82

------------------------------------------------------------------------------

$ pgbench -c 10 -t 10000 -v test -U test
starting vacuum...end.
starting vacuum accounts...end.
transaction type: TPC-B (sort of)
scaling factor: 1
number of clients: 10
number of transactions per client: 10000
number of transactions actually processed: 100000/100000
tps = 2786.377933 (including connections establishing)
tps = 2787.888209 (excluding connections establishing)



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