On Wed, Dec 07, 2005 at 08:01:54PM -0500, Phillip Susi wrote: > I have been using dmraid for a few months now to access my two disk > raid0 on my VIA SATA Raid controller. Today I noticed some IO errors > beyond the end of the disk in my syslog and when I investigated, it > looks to me like my raid setup is broken. > > The dm table that dmraid creates for the main raid volume device looks > like this: > > 0 144607678 striped 2 128 8:0 0 8:16 0 > > Now what I noticed is that 144607678 is NOT an even multiple of the > stripe width of 256 sectors ( 128 sector stripe factor x 2 disks ). > Shouldn't the total length of a striped mapper device allways be an even > multiple of the stripe width? I think that the last fractional stripe > at the end of the disk is the problem, because there aren't a full 128 > sectors left on the disk to access before rolling over to the next disk > in the stripe. Hrm, partial strides should be ok with device-mapper. Seems like reiser decided to allocate past EOD. Heinz > > So does this mean that my bios created a broken stripe? And why does > dmraid and the kernel device mapper accept such broken values? > > Wish me luck with using resizefs.reiserfs to shrink down the volume a > bit to avoid that broken tail end. > > _______________________________________________ > > Ataraid-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/ataraid-list =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Red Hat GmbH Consulting Development Engineer Am Sonnenhang 11 Cluster and Storage Development 56242 Marienrachdorf Germany Mauelshagen@xxxxxxxxxx +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ Ataraid-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ataraid-list
