On Mon, Feb 18, 2002 at 11:37:31PM -0500, Justin wrote: > Hi, > (1) can /etc/raidtab use raw disks instead of partitions? What you mean is probably /dev/hda rather than /dev/hda1 - correct ? That's not a "raw disk" in raw-disk sense, but the answer is "yes" nonetheless :) > With kernel 2.4.17 it builds most of the array on /dev/sda,/dev/sdb, Didn't the subject say IDE ? > then I get bogus scsi hardware sense errors during the > build (toward the end) .. on several attempts.. disks > drop out, then the array fails. persistent superblock is on. You have bad cabling. > Switching to partitions, (/dev/sda1, /dev/sda2..) 11+spare > worked fine! The enclosure was a sun A1000, connected to > an HVD adaptec, in case that makes a difference. If you use multiple partitions on the disks, the transfer time will significantly drop (because of massive seeking) - and this could explain why the cable failure doesn't show up - I guess. > (2) do all partitions have to be *exactly* the same size > for current raid5 code? 3 out of 12 18gb drives had slightly > smaller number of cylinders in their single partition that > made up the array. The array built fine, and tests fine, but > I'm concerned about this.. No - for RAID-5 (and -1, and -4), the code will use the smallest size as the size for all underlying partitions/disks. RAID-0 and RAID-linear will utilize differently sized disks fully. > (3) opinions sought if any on this IDE Terabyte rack > mount array? http://www.raidweb.com/ide.html that is connected > to the host via ultra160 scsi.. ? it would seem to save a lot > of the hassle of finding the right combination of kernel, > motherboard and controllers (to say nothing of wiring > nightmares) to build a 1terabyte array from cheap > 120gb+ IDE drives.. (obvious comments on $ cost not reqd!) How about a big enclosure (so that you can mount all the disks internally and still use cabling within spec) ? With 160G drives, that doesn't have to be a lot of drives after all. -- ................................................................ : jakob@unthought.net : And I see the elder races, : :.........................: putrid forms of man : : Jakob Østergaard : See him rise and claim the earth, : : OZ9ABN : his downfall is at hand. : :.........................:............{Konkhra}...............: - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
