From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anders Widman Subject: Re: Promise raid controller writes to disk, anybody know where? Date: Wed, 16 Apr 2003 18:51:11 +0200 Message-ID: <1389382.20030416185111@tnonline.net> References: <3E9D88FB.6090109@namesys.com> Reply-To: Anders Widman Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <3E9D88FB.6090109@namesys.com> List-Id: Content-Type: text/plain; charset="us-ascii" To: Hans Reiser Cc: bscott@ntisys.com, 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.... You can still use the controller, but I would do the mirroring natively in Linux than depend on the Promise BIOS to do it. -------- PGP public key: https://tnonline.net/secure/pgp_key.txt