I got a replacement for a failing disk, but the 2 drives seems to have slightly different formatting: For the failing one GNU Parted 2.3 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: WDC WD40 01FFSX-68JNUN0 (scsi) Disk /dev/sdb: 4001GB Sector size (logical/physical): 512B/4096B <<<------ Partition Table: gpt And the replacement (sdk) Model: WDC WD40 01FFSX-68JNUN0 (scsi) Disk /dev/sdk: 7814037168s Sector size (logical/physical): 512B/512B <<<<----- Partition Table: gpt So the first is 4k physical, and the second is 512b physical (I assume that's really a fib, but it's what the drive says). Could the mismatch in the physical sizes cause trouble? I ask because I did this: mdadm --grow /dev/md/media4 --add /dev/sdk2 --raid-devices=2 which resulted in the Feb 2 15:26:46 tempserver kernel: [ 8583.545160] md: bind<sdk2> Feb 2 15:26:46 tempserver kernel: [ 8583.957047] RAID1 conf printout: Feb 2 15:26:46 tempserver kernel: [ 8583.957051] --- wd:1 rd:2 Feb 2 15:26:46 tempserver kernel: [ 8583.957052] disk 0, wo:0, o:1, dev:sdb2 Feb 2 15:26:46 tempserver kernel: [ 8583.957054] disk 1, wo:1, o:1, dev:sdk2 Feb 2 15:26:46 tempserver kernel: [ 8583.957108] md: recovery of RAID array md126 Feb 2 15:26:46 tempserver kernel: [ 8583.957111] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. Feb 2 15:26:46 tempserver kernel: [ 8583.957112] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery. Feb 2 15:26:46 tempserver kernel: [ 8583.957115] md: using 128k window, over a total of 1953376064k. Feb 2 15:26:50 tempserver kernel: [ 8587.312261] usb 2-3: USB disconnect, device number 4 Feb 2 15:26:50 tempserver kernel: [ 8587.315908] scsi 8:0:0:3: rejecting I/O to offline device Feb 2 15:26:50 tempserver kernel: [ 8587.315912] scsi 8:0:0:3: [sdk] killing request Feb 2 15:26:50 tempserver kernel: [ 8587.315934] scsi 8:0:0:3: [sdk] Unhandled error code Feb 2 15:26:50 tempserver kernel: [ 8587.315936] scsi 8:0:0:3: [sdk] Feb 2 15:26:50 tempserver kernel: [ 8587.315939] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK Feb 2 15:26:50 tempserver kernel: [ 8587.315941] scsi 8:0:0:3: [sdk] CDB: Feb 2 15:26:50 tempserver kernel: [ 8587.315943] Write(16): 8a 00 00 00 00 00 00 0c 3e 80 00 00 00 80 00 00 Feb 2 15:26:50 tempserver kernel: [ 8587.315951] end_request: I/O error, dev sdk, sector 802432 Feb 2 15:26:50 tempserver kernel: [ 8587.315963] md/raid1:md126: Disk failure on sdk2, disabling device. Feb 2 15:26:50 tempserver kernel: [ 8587.315963] md/raid1:md126: Operation continuing on 1 devices.result of which from kern.log was I then tried dd if=/dev/disk/by-id/ata-WDC_WD4001FFSX-68JNUN0_WD-WMC130FACU91 of=/dev/null skip=802500 count=1000 which produced no error. The input is from the device previously known as sdk. So I can at least read from the sector that was associated with the error message above. BTW, the array I'm trying to mirror is on a part of the disk that I think is still good. -- 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
