Luke Scharf wrote: > Maurice Volaski wrote: > >>> Perhaps providing the computations rather than the conclusions would >>> be more persuasive on a technical list ;> >>> >>> >> 2 16-disk SATA arrays in RAID 5 >> 2 16-disk SATA arrays in RAID 6 >> 1 9-disk SATA array in RAID 5. >> >> 4 drive failures over 5 years. Of course, YMMV, especially if you >> drive drunk :-) >> >> > > My mileage does vary! > > On a 4 year old 84 disk array (with 12 RAID 5s), I replace one drive > every couple of weeks (on average). This array lives in a proper > machine-room with good power and cooling. The array stays active, though. > > -Luke >
I basically agree with this. We have about 150TB in mostly RAID 5 configurations, ranging from 8 to 16 disks per volume. We also replace bad drives about every week or three, but in six years, have never lost an array. I think our "secret" is this: on our 3ware controllers we run a verify at a minimum of three times a week. The verify will read the whole array (data and parity), find bad blocks and move them if necessary to good media. Because of this, we've never had a rebuild trigger a secondary failure. knock wood. Our server room has conditioned power and cooling as well. Jon _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
