Date: Mon, 9 Nov 2015 12:07:41 -0800 From: Tim Gustafson <tjg@ucsc.edu> To: Sean Chittenden <sean@chittenden.org> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS RAID 0+1 Throwing Checksum Errors Message-ID: <CAPyBAS4FS1Ta=jnztjOQ_WPn9fo8czOnG6i5G9iqdZgpcFPE6A@mail.gmail.com> In-Reply-To: <sig.0755373dd9.AF7A1800-6AA1-4B6D-9446-F51572CC64D9@chittenden.org> References: <CAPyBAS7oYvp6vvzetcGmrXy0_Qn0fXBN_d510w41CguDZCzMxw@mail.gmail.com> <sig.0755373dd9.AF7A1800-6AA1-4B6D-9446-F51572CC64D9@chittenden.org>
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> It could be the SSDs, the controller, cables, or power supply. > The problem might occur when the data is written, or when it is > read back. If this is occuring on all of the SSDs then look for > some shared component which might be causing the problem. I'll check into these possibilities. Now that I think of it, I should check to see of the Perc card has its own log that I could look at, even though we're not using its RAID features. > Tim, I've run into this a dozen or so times on servers where their > power is "dirty" (i.e. home or small offices with small servers that > use ZFS). If you plug the box into a UPS to condition the line you > may find that the checksum errors go away. It's pretty amazing > to see and happens with both SSD and spinning rust. It's not > always the case, but it's a common enough environmental problem. > Report back if you try this and it solves your problem. I'm pretty sure that's not the case. This server is a new-ish (3 months old?) Dell R630 with redundant power supplies, connected to an industrial APC UPS, connected to an industrial diesel backup generator, housed in a real bone-fide server room with industrial cooling. There's about 80 other physical servers in this room room, and none of the others are exhibiting this behavior. -- Tim Gustafson Technical Lead, Baskin School of Engineering tjg@ucsc.edu 831-459-5354 Baskin Engineering, Room 313A
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