Date: Wed, 02 May 2012 18:06:04 -0400 From: "Simon" <simon@optinet.com> To: "Rich" <rercola@pha.jhu.edu> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: Replacing dead drives in ZRAID2 Message-ID: <20120502220609.D7A60106579A@hub.freebsd.org> In-Reply-To: <CAOeNLuoUQNv16Td8wcJzK2x==M0esYh6Y2aGvuN3sOE_W7LoSg@mail.gmail.com>
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I'm trying to figure out why it's not working with ahd driver. It's beginning to look more and more as if I shouldn't use ZFS with ahd driver. That's why I asked for someone to confirm whether or not the two can be used together. It also seems that everyone moved on to SAS/SATA technology, albeit it's hard to believe. There are few machine I have from early 2007, so 5 years old, that have the same controller onboard. So while u320 is a decade old technology, many servers been built using it in 2006+ Unless someone can confirm otherwise, I will assume ahd and ZFS do not work well together when it comes to dying/swapping drives. Having said the above, is there any FreeBSD RAID software I can use with ahb driver that won't give me same issues I'm experiencing with ahd and ZFS? vinum? gmirror? Can I expect them to work better with ahd given ahd cannot handle pulling of working drives out of SAF-TE aware enclosure? Thank you, Simon On Wed, 2 May 2012 17:18:22 -0400, Rich wrote: >It's perfectly possible to do a 3-way RAID-Z2 - just not useful, AFAIK. >Also, Simon, I think the disconnect between you and the mailing list >is that you are observing bad behavior of the system when you remove >the drives, and you think this is a ZFS problem. This is not a ZFS >problem - if the underlying storage driver (ahd) freezes up and stops >handling requests (which is what it sounds like you're describing >here), there's not much ZFS can do about it. >- Rich >On Wed, May 2, 2012 at 5:05 PM, Mark Felder <feld@feld.me> wrote: >> First of all, you're testing on decade old SCSI hardware that probably >> hasn't seen any serious use on a newer FreeBSD install in a very, very long >> time. >> >> Secondly, I'm confused about the concept of a "3 drive RAIDZ2". How is that >> even possible? Two drives have to be parity, so the last drive is... the >> entire dataset? Why aren't you just doing a 3-way mirror? >> >> And finally yes, you can just yank drives in a ZFS array to simulate a >> failure. After reinsertion you have to manually add them back to the pool, >> but it certainly works. >> >> _______________________________________________ >> freebsd-fs@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-fs >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >_______________________________________________ >freebsd-fs@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-fs >To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
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