I would recommend trying out several stripe sizes, and making your own
measurements.
A while ago I was involved in building a data warehouse system (Oracle,
DB2) and after several file and db benchmark exercises we used 256K
stripes, as these gave the best overall performance results for both
One big caveat re. the "SAME" striping strategy, is that readahead can
really hurt an OLTP you.
Mind you, if you're going from a few disks to a caching array with many
disks, it'll be hard to not have a big improvement
But if you push the envelope of the array with a "SAME" configuration,
read
Hadley Willan wrote:
To answer question 1, if you use software raid the chunk size is part of
the /etc/raidtab file that is used on initial container creation. 4KB is
the standard and a LARGE chunk size of 1MB may affect performance if
you're not writing down to blocks in that size continuously.
Bjoern Metzdorf wrote:
You might also consider configuring the Postgres data drives for a
RAID 10 SAME configuration as described in the Oracle paper "Optimal
Storage Configuration Made Easy"
(http://otn.oracle.com/deploy/availability/pdf/oow2000_same.pdf). Has
anyone delved into this before?
O
James Thornton wrote:
This is what I am considering the ultimate platform for postgresql:
Hardware:
Tyan Thunder K8QS board
2-4 x Opteron 848 in NUMA mode
4-8 GB RAM (DDR400 ECC Registered 1 GB modules, 2 for each processor)
LSI Megaraid 320-2 with 256 MB cache ram and battery backup
6 x 36GB SCSI
Bjoern Metzdorf wrote:
Hi,
at first, many thanks for your valuable replies. On my quest for the
ultimate hardware platform I'll try to summarize the things I learned.
-
This is what I am considering the ultimate platform for postgresql:
This is somthing I wish more of us did on the lists. The list archives
have solutions and workarounds for every variety of problem but very few
summary emails exist. A good example of this practice is in the
sun-managers mailling list. The original poster sends a "SUMMARY" reply
to the list with
Hi,
at first, many thanks for your valuable replies. On my quest for the
ultimate hardware platform I'll try to summarize the things I learned.
-
This is our current setup:
Hardware:
Dual Xeon DP 2.4 on a TYAN S2722-533 with HT enabled
3
