Re: Tuning PostgreSQL
От | Alexander Priem |
---|---|
Тема | Re: Tuning PostgreSQL |
Дата | |
Msg-id | 006801c35050$518c49a0$b696a8c0@APR обсуждение исходный текст |
Ответ на | Re: Tuning PostgreSQL ("Shridhar Daithankar" <shridhar_daithankar@persistent.co.in>) |
Ответы |
Re: Tuning PostgreSQL
Re: Tuning PostgreSQL |
Список | pgsql-performance |
Wow, I never figured how many different RAID configurations one could think of :) After reading lots of material, forums and of course, this mailing-list, I think I am going for a RAID5 configuration of 6 disks (18Gb, 15.000 rpm each), one of those six disks will be a 'hot spare'. I will just put the OS, the WAL and the data one one volume. RAID10 is way to expensive :) If I understand correctly, this will give great read-performance, but less write-performance. But since this server will be equipped with an embedded RAID controller featuring 128Mb of battery-backed cache, I figure that this controller will negate that (at least somewhat). I will need to find out whether this cache can be configured so that it will ONLY cache WRITES, not READS.... Also because of this battery backed cache controller, I will go for the ext2 file system, mounted with 'noatime'. I will use a UPS, so I don't think I need the journaling of ext3. XFS is not natively supported by RedHat and I will go for the easy way here :) 1 Gb of RAM should be enough, I think. That is about the only point that almost everyone agrees on :) Do you think ECC is very important? The server I have in mind does not support it. Another one does, but is is about 1.000 euros more expensive :( One CPU should also be enough. As for postgresql.conf settings, I think I will start with the following : max_connections = 128 superuser_reserved_connections = 1 shared_buffers = 8192 max_fsm_relations = 1000 max_fsm_pages = 100000 wal_buffers = 32 sort_mem = 2048 vacuum_mem = 32768 effective_cache_size = 28672 (this one I'm not sure about, maybe this one needs to be higher) random_page_cost = 2 geq0_threshold = 20 This pretty much sums it up. What do you think about this config? It may not be the fastest, but a server like this will cost about 4750 euros, and that is including an Intel Xeon 2.4GHz cpu, redundant power supply, WITHOUT the UPS. Seems very reasonable to me... Kind regards, Alexander Priem.
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