Date: Mon, 05 Mar 2007 16:50:02 -0600 From: Derek Ragona <derek@computinginnovations.com> To: "Michel, Dietmar" <Dietmar_Michel@bmc.com>, <freebsd-questions@freebsd.org> Subject: Re: RAID5 degraded - system hangs Message-ID: <6.0.0.22.2.20070305164542.025808f8@mail.computinginnovations.com> In-Reply-To: <0C398216960631429151B4A4B6B1FC03038CCAB0@fra-ex-01.adprod. bmc.com> References: <0C398216960631429151B4A4B6B1FC03038CCAB0@fra-ex-01.adprod.bmc.com>
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I'm no expert, but have experienced a few RAID issues. First, RAID 5 will=
=20
become degraded and will try to rebuild upon a drive failure, once the=20
failed drive is replaces. In Mirrored RAID, RAID 1, or RAID 10, the system=
=20
will continue to function on the good drive but will alert the=20
administrator of the drive failure.
One last thing, SATA RAID drives, while they are often said to be=20
hot-swapable, most manufacturer's recommend power-off then swap=20
drives. With SCSI hot swapable drives they can be swapped with power still=
on.
-Derek
At 09:22 AM 3/5/2007, Michel, Dietmar wrote:
>Hi Guys,
>
>
>
>I=B4m using an older Server with FreeBSD 6.2 als Fileserver in my home off=
ice.
>
>Now I made an upgrade using 4 SATA II disks connected to a promise TX4310=
=20
>Raid controller.
>
>Defining a RAID5 a bios level, starting the server and building up the=20
>Raid at OS level:
>
># atacontrol create RAID5 32 ad4 ad6 ad8 ad10
>
># bsdlable ...
>
># newfs ...
>
>
>
>And now I have a functional Raid named ar0.
>
>
>
>At boot time the bios told me that even at this level the raid in=20
>initializing - world seemed to be ok.
>
>
>
>Now I tried to prove Raid function and disconnect one disk.
>
>Theoretical data is covered by the rest of 3 ... but after I get the=20
>system message that one disk has been disconnected the maschine stopps wor=
king.
>
>Told me: ar0 raid 5 degarded after a fw minutes no input is possibble.
>
>
>
>
>
>Even after reboot
>
>....
>
>ar0: disk0 Ready
>ar0: disk1 Ready
>ar0: disk2 Ready
>ar0: disk3 down no device found
>
>... end of work
>
>
>
>No single user mode or other starting option seemed to work.
>
>I have no chance to rebuild the raid via atacontrol.
>
>
>
>Any hints?
>
>Raid without reliability doesn=B4t make sense!
>
>
>
>Regards
>
>
>
> Dietmar
>
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