Date: Sat, 14 Feb 2009 05:05:27 -0800 (PST) From: Gabe <nrml@att.net> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD Preferred RAID controllers Message-ID: <73335.82543.qm@web83808.mail.sp1.yahoo.com> In-Reply-To: <4990B75D.1080806@infracaninophile.co.uk>
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--- On Mon, 2/9/09, Matthew Seaman <m.seaman@infracaninophile.co.uk> wrote: > From: Matthew Seaman <m.seaman@infracaninophile.co.uk> > Subject: Re: FreeBSD Preferred RAID controllers > To: nrml@att.net > Cc: freebsd-questions@freebsd.org > Date: Monday, February 9, 2009, 3:08 PM > Gabe wrote: > > > Now with a gstripe+gmirror setup, would it be possible > to fail a > > specific drive on purpose? I mean fail a (good) drive, > pull it out, > > replace it and rebuild(?) it. I know I know, but humor > me. > > Yes. > > Cheers, > > Matthew > > Well, to 'fail' the drive, you'ld have to > physically pull the drive > from the chassis which will involve a power cycle unless > you've got > hot-swap drives. Of course, you should confirm that your > system will > boot with the RAID in a degraded state and that rebuilding > the RAID will > continue even if interrupted by a reboot. gmirror(8) > passes those > tests. You do have to type some commands to get a mirror > to rebuild > (examples are shown in the man page) unlike some hardware > RAIDs where > simply inserting an unused disk is sufficient. > > -- Dr Matthew J Seaman MA, D.Phil. 7 > Priory Courtyard > Flat 3 > PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate > Kent, CT11 > 9PW Hello again all, So I wanted to test out gmirror on software RAID so I installed a completely vanilla FBSD 7, as base an install as you can get, it hasn't even been on the network. Anyway, I did the following upon first boot to get gmirror going: # sysctl kern.geom.debugflags=17 Then: # gmirror label -vb round-robin gm0 /dev/ad0 Then: # gmirror load Then: # echo 'geom_mirror_load="YES"' >> /boot/loader.conf Then I edited /etc/fstab to show: /dev/mirror/gm0s1b none swap sw 0 0 /dev/mirror/gm0s1a / ufs rw 1 1 /dev/mirror/gm0s1e /tmp ufs rw 0 0 /dev/mirror/gm0s1f /usr ufs rw 2 2 /dev/mirror/gm0s1d /var ufs rw 2 2 I then rebooted the system, once I setup the mirror: # gmirror insert gm0 /dev/ad1 # gmirror status and it shows as COMPLETE. Okay, here comes the annoying part, I've got hot-swappable bays and I went ahead and pulled the drive. I then tried to write to the disk so that it realizes the disk is no longer there: # touch file once I do that and execute: gmirror status it shows as degraded. All fine and dandy. However when it comes time to pop the drive back in the drive is not recognized at all. I mean, the green light on the bay comes on so it definitely makes a connection but then thats it, atacontrol list doesn't list it and gmirror status still shows the same, degraded. What gives? I wonder if this is hardware related? Bios related even? Any clues? Thanks!
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