Date: Mon, 20 Jun 2005 02:37:15 -0700 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: "P.U.Kruppa" <root@pukruppa.de> Cc: freebsd-questions@freebsd.org Subject: RE: Yet another RAID Question (YARQ) Message-ID: <LOBBIFDAGNMAMLGJJCKNGEMBFBAA.tedm@toybox.placo.com> In-Reply-To: <20050620033646.W11229@www.pukruppa.net>
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>-----Original Message----- >From: owner-freebsd-questions@freebsd.org >[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of P.U.Kruppa >Sent: Sunday, June 19, 2005 6:37 PM >To: Ted Mittelstaedt >Cc: P.U.Kruppa; freebsd-questions@freebsd.org >Subject: RE: Yet another RAID Question (YARQ) > > >On Sun, 19 Jun 2005, Ted Mittelstaedt wrote: > >> >> What model of Proliant? >ML 350 G4 > Oh good, we have a customer that has been looking at one of these for FreeBSD and I'm glad to hear that you didn't have problems with it. With these all you get is hot-swap support although you might have to do a camcontrol rescan after swapping the disk. However, the RAID card intelligence is supposed to operate independently of the disk driver to do the remirroring or parity rebuilding. In theory you should be able to simply yank out a failed disk and slap in a replacement and the operating system shouldn't even notice anything. No matter what the OS in use. Actually, the Windows management tools for this raid controller on a server are observational as well. There is no rebuild tool or anything like that. When we set these systems up for customers (All the recent Proliants use the same RAID controller) we usually configure them RAID-5 with 4 physical disks, the setup will set 3 of the disks in the array, and one a hot-spare. And in the event of a disk failure, which you can tell by looking at the disk drive lights, or going into the management interface, you simply pull out the bad disk and put in the replacement and the RAID card takes care of the rest of it. As for knowing if a disk has failed, I think the only way to know is to watch the little lights on the disk front. And that is true of the Windows tools also - unless you install a complete HP Systems Insight Manager console (generally on a separate machine) which talks to all your little HP servers that run the various HP-SIM agents that talk to the raid card, etc. If I were you I would test all this by pulling a disk and seeing what happens. HP just released a binary driver for this series of RAID cards for Linux in May 2005. It supports RedHat and Suse. I do not know if they ship software notification tools with this binary driver, or if it also talks to a HP-SIM console. Ted
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