Hello Alasdair, I have used tur and this allows the system to boot. When I run "ll /dev/mpath* I see the dm device created. All appears to be working OK. Fdisk also reports the same number of devices as paths to the device. When I try to make the file system (ext2 or 3) the make fails on writing super blocks. If I remove the multipath.conf file and make a file system on the 4k block sd device the file system makes and I can read/write to the device. As soon as try this again with the device-mapper the process fails. If I reformat the LUN as 512byte blocks the device-mapper works and I can make the file system. Thanks, Bob -----Original Message----- From: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] On Behalf Of Alasdair G Kergon Sent: Wednesday, June 13, 2007 1:57 PM To: device-mapper development Subject: Re: 4k block LUN problem Try using an alternative path checker like tur or directio. readsector0 seems to have '512' hard-coded - this ought to get fixed. Alasdair -- agk@xxxxxxxxxx -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
