Date: Wed, 19 Dec 2007 20:30:37 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hardware@freebsd.org Subject: Re: Questions about gmirror Message-ID: <fkbrgv$k08$1@ger.gmane.org> In-Reply-To: <C38E088C.2BEDA%rp_freebsd@mac.com> References: <C38E088C.2BEDA%rp_freebsd@mac.com>
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[-- Attachment #1 --] Ravi Pokala wrote: > (1) What is the procedure for swapping out a dead drive while the system is > online? If the drive and the controller support hot swapping, remove it, put a new drive in and do: # atacontrol reinit channel # gmirror forget gm0 # gmirror insert gm0 /dev/newdrive Not many ATA drive+controller combinations are hot-swap-able. > (2) Say a drive dies as a result of a power event, and does not respond to > probing during the subsequent boot. Once I swap out the drive, (how) can I > get the system to re-probe, recognize the new drive, and start > reconstruction? Exactly the same as above. > (3) Will the stock bootloader and kernel be able to boot from just ad6 if > ad4 dies, or is ad4 special because it was the original boot drive? (Or is > this a function of the BIOS?) It's a function of the BIOS but once the kernel boots it will bring up gm0 and proceed from there "as usual". > (4) Say I have two identical machines Foo and Bar, and four identical drives > A, B, C, and D. I insert drive A into machine Foo as /dev/ad4 and install > 6.2-RELEASE. I then insert drive B into Foo as /dev/ad6 and mirror using the > procedure described above. When mirroring completes, I shut Foo down. Can I > then pull drive B out of Foo:/dev/ad6 and install it in machine > Bar:/dev/ad4, install drives C and D as /dev/ad6 on both machines to act as > new mirrors, and effectively clone Foo's installation onto Bar? With creative use of "gmirror forget" and "gmirror insert", yes. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHaXFdldnAQVacBcgRAuXiAKCJ6n5vXR6ai7mvbHrlrZB/u2kcGwCgnKzG n6UJYj3xNRftL19wodKdmSg= =9ZHB -----END PGP SIGNATURE-----
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