Horton

Re: SCSI vs. IDE performance test

Scott Ribe <scott_ribe@killerbytes.com>

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From: Scott Ribe <scott_ribe@killerbytes.com>
To: Rick Gigger <rick@alpinenetworking.com>, <pgsql-general@postgresql.org>
Date: 2003-10-28T18:10:08Z
Lists: pgsql-general 
> It seems to me file system journaling should fix the whole problem by giving
> you a record of what was actually commited to disk and what was not.  I must
> not understand journaling correctly.  Can anyone explain to me how
> journaling works.

Journaling depends, absolutely critically, on the OS knowing what data has
actually been written to disk. It can't be any other way; with an in-disk
write cache the OS has no way to know when the *journal* has been written to
disk, therefore journaling can't work.


-- 
Scott Ribe
scott_ribe@killerbytes.com
http://www.killerbytes.com/
(303) 665-7007 voice