Re: disk performance benchmarks
От | Michael Paesold |
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Тема | Re: disk performance benchmarks |
Дата | |
Msg-id | 003801c49b07$f33b6990$ad01a8c0@zaphod обсуждение исходный текст |
Ответ на | disk performance benchmarks ("Shane Wright" <shiversraa@gmail.com>) |
Ответы |
Re: disk performance benchmarks
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Список | pgsql-general |
Jeffrey W. Baker wrote: > Current issue: > > A dual 64-bit Opteron 244 machine with 8GB main memory, two 4-disk RAID5 > arrays (one for database, one for xlogs). PG's config is extremely > generous, and in isolated benchmarks it's very fast. It depends on the controller, but usually I would expect a better performance if xlogs are just on a two-disk mirror and the rest of the disks for data (6 splindles instead of 4 then). I don't think RAID5 is a benefit for xlogs. Regards, Michael Paesold > But, in reality, performance is abyssmal. There's something about what > PG does inside commits and checkpoints that sends Linux into a catatonic > state. For instance here's a snapshot of vmstat during a parallel heavy > select/insert load: ...
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