Re: File Systems Compared - Mailing list pgsql-performance

From Mark Lewis
Subject Re: File Systems Compared
Date
Msg-id 1165424114.9734.298.camel@archimedes
Whole thread Raw
In response to Re: File Systems Compared  (Florian Weimer <fweimer@bfk.de>)
Responses Re: File Systems Compared  (Bruno Wolff III <bruno@wolff.to>)
List pgsql-performance
> Anyone run their RAIDs with disk caches enabled, or is this akin to
> having fsync off?

Disk write caches are basically always akin to having fsync off.  The
only time a write-cache is (more or less) safe to enable is when it is
backed by a battery or in some other way made non-volatile.

So a RAID controller with a battery-backed write cache can enable its
own write cache, but can't safely enable the write-caches on the disk
drives it manages.

-- Mark Lewis

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