Date: Fri, 23 Jun 2006 10:46:13 +0200 From: "Philippe Lang" <philippe.lang@attiksystem.ch> To: "Ted Mittelstaedt" <tedm@toybox.placo.com>, "Doug Poland" <doug@polands.org> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: RE: ICH5R, ICH7R or Promise PDC20378 RAID? Message-ID: <6C0CF58A187DA5479245E0830AF84F421D0E59@poweredge.attiksystem.ch>
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This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C696B2.3CB444F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Ted Mittelstaedt wrote: >> Hi, >> >> I'm sure there are solutions to make things work, but personnaly, I >> don't feel confortable with a RAID system that acts that way, and >> that is supposed to make the whole system more robust and >> problem-free. > > Your missing the point. > > If a disk crashes it wipes the metafile off the disk. > > If you want to simulate a disk crash, issue a raid detach command > first, then pull the disk. > > The ata raid in the ata driver isn't written to handle the > condition of > a disk being pulled that has nothing wrong with it then reinserted. > It is written to handle the condition of a disk crashing, then being > pulled, then a new one replaced. > >> I used to play with hardware SCSI RAID controllers, and was never >> able to trash the system. > > I have SCSI raid controllers too that I can do that with. But keep in > mind that these controllers firmware is written to if a disk > is pulled then > replaced, it immediately assumes that the disk is toast, and > rebuilds it > from scratch. Hi, I'm not an expert in RAID Ted, and I don't want to be. Simply, in situations where a disk crashes, and the server is not redundant anymore, I prefer having a controller that I can rely on, both eyes closed. I have just installed the 3WARE controller this morning, and did the exact same operations I did with the ICH5/7R and onboard Promise controller of my ASUS boards. It's simply not comparable at all, and for a really affordable price. The server did not crash, and is by the way rebuilding the RAID at the moment... Despite all my efforts, I was not able to trash it. A 3WARE controller is really worth the investment, really. 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