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Re: File Systems Compared
- From: Mark Lewis <mark(dot)lewis(at)mir3(dot)com>
- To: Brian Wipf <brian(at)clickspace(dot)com>
- Cc: pgsql-performance(at)postgresql(dot)org
- Subject: Re: File Systems Compared
- Date: Wed, 06 Dec 2006 08:55:14 -0800
- Message-id: <1165424114(dot)9734(dot)298(dot)camel(at)archimedes>
> 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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