Hi, all -- Crossing my fingers that this gets through ... My last few messages have not come back to me on the list. After a first attempt to assemble the two working and one wonky drives of my 4-disk array and then watching reads hang forever, I have now used dd to pull an image of each RAID partition davidtg@gezebel:~> sudo fdisk -l /dev/sda Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors Disk model: ST4000DM000-1F21 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: gpt Disk identifier: 482CA0F0-663B-409D-A4DF-4A4B248E6D23 Device Start End Sectors Size Type /dev/sda1 2048 7813774990 7813772943 3.7T Linux RAID /dev/sda2 7813775360 7814037134 261775 127.8M Linux filesystem diskfarm:/mnt/10Traid50md/tmp # ls -goh 4T* -rw-r--r-- 1 4.0T Nov 12 02:05 '4Tsda1.EYNA.dd-bs=256M-conv=sparse,noerror' -rw-r--r-- 1 4.0T Nov 12 02:05 '4Tsdb1.5YD9.dd-bs=256M-conv=sparse,noerror' -rw-r--r-- 1 4.0T Nov 12 02:05 '4Tsdc1.5ZY3.dd-bs=256M-conv=sparse,noerror' diskfarm:/mnt/10Traid50md/tmp # file 4Tsda1.EYNA.dd-bs\=256M-conv\=sparse\,noerror 4Tsda1.EYNA.dd-bs=256M-conv=sparse,noerror: Linux Software RAID version 1.2 (1) UUID=ca7008ef:90693dae:6c231ad7: 8b3f92d name=diskfarm:0 level=5 disks=4 so that I can use overlays to assemble the device and replay the XFS journal to get up and running again to finally be able to pull off this data. After going back and forth across the deprecated wiki pages, I'm working through Irreversible Failure Recovery https://raid.wiki.kernel.org/index.php/Irreversible_mdadm_failure_recovery and have created diskfarm:/mnt/10Traid50md/tmp # ls -goh overlay-sd* -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sda1 -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sdb1 -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sdc1 diskfarm:/mnt/10Traid50md/tmp # losetup -a /dev/loop1: [66326]:1059 (/mnt/10Traid50md/tmp/overlay-sdb1) /dev/loop2: [66326]:1060 (/mnt/10Traid50md/tmp/overlay-sdc1) /dev/loop0: [66326]:1058 (/mnt/10Traid50md/tmp/overlay-sda1) my overlay files and loopback devices. But ... It seems that blockdev does not like diskfarm:/mnt/10Traid50md/tmp # blockdev --getsize ./overlay-sda1 blockdev: ioctl error on BLKGETSIZE: Inappropriate ioctl for device my files and so it won't give me the size that I need for dmsetup in the next step. How can I use these partition images as source for faking up my RAID array to recover the contents? I seem to have gotten myself stuck :-/ TIA & HAND :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt
