| From: | Scott Ribe <scott_ribe(at)killerbytes(dot)com> |
|---|---|
| To: | Rick Gigger <rick(at)alpinenetworking(dot)com>, <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: SCSI vs. IDE performance test |
| Date: | 2003-10-28 18:10:08 |
| Message-ID: | BBC3FF10.37DF3%scott_ribe@killerbytes.com |
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| Thread: | |
| 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(at)killerbytes(dot)com
http://www.killerbytes.com/
(303) 665-7007 voice
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