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From Alan Burlison <Alan.Burli...@sun.com>
Subject Re: Forcing Data to Disk on JPA Commit
Date Sat, 15 Dec 2007 10:17:16 GMT
Knut Anders Hatlen wrote:

> This is true, but many systems have enabled the write cache on the hard
> drive. This means that although Derby and the OS think the data have
> been written to non-volatile storage, they may still reside in the
> volatile write cache on the disk and can be lost in a power outage.

Linux & Windows run with the write cache turned on by default.  Solaris 
runs with it turned off by default under UFS, ZFS *may* enable it, 
depending on if it is safe to do so or not.

http://weblogs.java.net/blog/davidvc/archive/2005/10/the_story_of_th.html

-- 
Alan Burlison
--

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