From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Reiser Subject: Re: Promise raid controller writes to disk, anybody know where? Date: Wed, 16 Apr 2003 20:46:51 +0400 Message-ID: <3E9D88FB.6090109@namesys.com> References: Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: bscott@ntisys.com Cc: ReiserFS Mailing List bscott@ntisys.com wrote: >On Wed, 16 Apr 2003, at 8:24pm, reiser@namesys.com wrote: > > >>I just bought this motherboard with a promise raid controller builtin >>whose manual mentions that it writes information to disk (volume and >>config info I believe). >> >> > > Some RAID controllers write information to the disk, but never expose it >to the host OS. For example, say the RAID controller writes information to >the last block in the disk. The disk it then presents to the host OS will >be one block shorter. I don't know if your Promise "RAID controller" is >one of those. > > I put "RAID controller" in quotes because most Promise "RAID controllers" >are simply a more-or-less standard IDE interface, with RAID done in software >on the host (the software either comes from the BIOS, or the device driver). >You're likely better off using your OS's native software RAID in that event. > > Also, AFAIK, support for Promise RAID controllers under Linux (I assume >you're running Linux) is poor at best. You way want to avoid using it at >all. > > > Ok, I'll not use it then. I was thinking of mirroring, but I was assuming it was all done in hardware.... -- Hans