From mboxrd@z Thu Jan 1 00:00:00 1970 From: Edward Shishkin Subject: Re: Where to put the journal Date: Thu, 05 Aug 2004 20:39:56 +0400 Message-ID: <411262DC.4070206@namesys.com> References: <410CCFCA.1030309@baldauf.org> <410E08F7.9020303@namesys.com> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <410E08F7.9020303@namesys.com> List-Id: Content-Type: text/plain; charset="iso-8859-1"; format="flowed" To: =?ISO-8859-1?Q?Xu=E2n_Baldauf?= Cc: "Vladimir V. Saveliev" , Reiserfs List Vladimir V. Saveliev wrote: > Hello > > Xu=E2n Baldauf wrote: > >> Hello, >> >> I want to setup a Linux software RAID 5 over disks of different speed=20 >> with reiserfs on top. I know that the journal has to be accessed=20 >> frequently for comparably small accesses. That's why I'm considering=20 >> to "offload" the journal onto an extra partition on a faster disk of=20 >> the RAID set. >> >> Thus, the journal would not be protected by the RAID, but this is not=20 >> so important for me. >> >> Is this kind of reasoning sane? Would there be any speedup by=20 >> offloading the journal? >> > Hello. Unfortunately comprehensive results of journal relocation are obsolete as it was done at the beginning of mongo evolution. As I remember there were no any essential speedups. The only result of journal relocation that was created by new mongo benchmark can be found here: http://thebsh.namesys.com/benchmarks/journal_relocation_to_NVRAM.html Edward. > Person who did some tests on non standard journal is on vacation. He=20 > is expected to come back today. Maybe he remembers benchmark results, > > >