I had two 80 GB disks in a raid1 set and wanted to replace them with new 300 GB disks. Replacing went fine and 'mdadm --grow --size max' seemed to work fine until I tried to run 'pvresize'. pvresize complained that md device was smaller than before and refused to resize and soon after that there was also complaints about access beyond end of device. After restarting md array everything worked fine and I was able to resize physical volume successfully. mdadm --version if that matters: mdadm - v1.12.0 - 14 June 2005 Feb 16 19:40:23 galileo kernel: md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. Feb 16 19:40:23 galileo kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction. Feb 16 19:40:23 galileo kernel: md: using 128k window, over a total of 80043136 blocks. Feb 16 20:30:40 galileo kernel: md: md3: sync done. Feb 16 20:30:40 galileo kernel: RAID1 conf printout: Feb 16 20:30:40 galileo kernel: --- wd:2 rd:2 Feb 16 20:30:40 galileo kernel: disk 0, wo:0, o:1, dev:hdf1 Feb 16 20:30:40 galileo kernel: disk 1, wo:0, o:1, dev:hdh1 Feb 16 22:45:52 galileo kernel: md: syncing RAID array md3 Feb 16 22:45:52 galileo kernel: md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. Feb 16 22:45:52 galileo kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconst ruction. Feb 16 22:45:52 galileo kernel: md: using 128k window, over a total of 293049600 blocks. Feb 16 22:45:52 galileo kernel: md: resuming recovery of md3 from checkpoint. Feb 16 22:45:54 galileo kernel: attempt to access beyond end of device Feb 16 22:45:54 galileo kernel: md3: rw=1, want=23855496, limit=7285248 Feb 16 22:45:54 galileo kernel: Buffer I/O error on device dm-6, logical block 0 Feb 16 22:45:54 galileo kernel: lost page write due to I/O error on dm-6 -- Antti Salmela - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html