> FMA (not ZFS, directly) looks for a number of > failures over a period of time. > By default that is 10 failures in 10 minutes. If you > have an error that trips > on TLER, the best it can see is 2-3 failures in 10 > minutes. The symptom > you will see is that when these long timeouts happen, > they take a long time > because, by default, the drive will be reset and the > I/O retried after 60 seconds. That's very good news. I'm trying to get the stuff together to set up my zfs server, and I'm also perfectly willing to trade slower operation and more disks to get zfs' scrubbing and other operations.
The recent discovery that WD has decided to up its prices in a back-door manner by making sure that the DIY RAID folks can't modify TLER on cheaper drives was a real slap in the face, potentially more than doubling the price of storage. I've dealt with the MBA mentality before, and I don't like it. >:-| This discovery was bad enough to almost put me off building a server entirely, with the apparent options of paying 100% more for the disks or having the array suffer 100% data loss on any significant read/write error. So let me be sure I understand. If I'm using solaris/zfs, I can use FMA to set the level of retries/time to be waited if I get a disk error before taking a disk out of the array. Is that correct? If it is, and that can be set to allow an array of disks to tolerate most instances of read/write errors without corrupting an entire array, then I'm back on with the server scheme. The whole point of going to solaris/zfs is background scrubbing for me. I'm willing for it to be slow - however slow it is, it's much faster than finding the backup DVDs in the closet, pilfering through them to find the right one, then finding out the DVD set has bit-rot too. I apologize for the baby-simple questions. I'm reading documentation as hard as I can, but there's a world of difference between reading documentation and understanding and using the tools described. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
