On 12/10/2014 11:44 AM, Maila Fatticcioni wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello. I need to tune a postgres installation I've just made to get a better performance. I use two identical servers with a hot replication configuration. The two servers have the following hardware: Dual Processor Intel Xeon E5-2640V2 20Mb cache 2.00Ghz, Ram Mem. 32Gb DDR-3 Ecc Registered, Controller MegaRaid 8-ports 1Gb cache, 4 Enterprise Hdd NL Sas 600 4Tb Sata, 2 Samsung SSD 840 Pro Series 512Gb, 2 Hdd 500 Gb I made a software raid with the last two hard disks with ext4 and I installed Ubuntu 14.04.1 LTS (I have to use this SO) on it. I made a hardware raid with the four SAS hard disks and I mount the partition on it with ext4 without journaling and I put the database on it.
Leaving aside all the valid points Patrick already made, as of late I've found xfs a better choice for Postgres, performance wise.
Now I have two more steps to do. 1- could you please help tuning the configuration? What are the best value I should use for wal_buffers and shared_buffers?
it's probably outdated but you could try to read Greg Smith's "PostgreSQL 9.0 High Performance", because at least you could have an idea of almost all the attack-points you could use to increase you overall performance. Even in the archive of this very mailinglist you'll surely find a lot of good advice, e.g. one that I've read here recently is avoid using any kernels between ver 3.0 and 3.8 (http://www.databasesoup.com/2014/09/why-you-need-to-avoid-linux-kernel-32.html)
2- I would like to use the two SDD to store the wal file. Do you think it is useful or how should I use them?
I definitely would give it a try. Andrea -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
