On Sun, December 28, 2008 11:43 am, Richard Scobie wrote: > Just assembled a new Fedora 9 machine - md1-5 created OK, but am having > trouble putting md6 together - machine rebooted after partitioning): > > [root@hugo2 ~]# mdadm -C /dev/md6 -l 1 -n 2 /dev/sda1 /dev/sdb1 > mdadm: Cannot open /dev/sda1: No such device or address > mdadm: Cannot open /dev/sdb1: No such device or address > mdadm: create aborted > This typically happens because /dev/sda and /dev/sdb have md superblocks on them and mdadm attempts to assemble an array from those and in the process tell the kernel to forget about the partitions. Can you: blockdev --rereadpt /dev/sda blockdev --rereadpt /dev/sdb mdadm -E /dev/sda* /dev/sdb* and report the result? Thanks, NeilBrown > dmesg: > > ------------------------------------------------ > > scsi0 : sata_sil > scsi1 : sata_sil > ata1: SATA max UDMA/100 mmio m512@0xf0401000 tf 0xf0401080 irq 21 > ata2: SATA max UDMA/100 mmio m512@0xf0401000 tf 0xf04010c0 irq 21 > ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) > ata1.00: ATA-8: ST31000340NS, SN05, max UDMA/133 > ata1.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 0/32) > ata1.00: configured for UDMA/100 > ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310) > ata2.00: ATA-8: ST31000340NS, SN05, max UDMA/133 > ata2.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 0/32) > ata2.00: configured for UDMA/100 > scsi 0:0:0:0: Direct-Access ATA ST31000340NS SN05 PQ: 0 ANSI: > 5 > sd 0:0:0:0: [sda] 1953525168 512-byte hardware sectors (1000205 MB) > sd 0:0:0:0: [sda] Write Protect is off > sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 > sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't > support DPO or FUA > sd 0:0:0:0: [sda] 1953525168 512-byte hardware sectors (1000205 MB) > sd 0:0:0:0: [sda] Write Protect is off > sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 > sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't > support DPO or FUA > sda: sda1 > sd 0:0:0:0: [sda] Attached SCSI disk > scsi 1:0:0:0: Direct-Access ATA ST31000340NS SN05 PQ: 0 ANSI: > 5 > sd 1:0:0:0: [sdb] 1953525168 512-byte hardware sectors (1000205 MB) > sd 1:0:0:0: [sdb] Write Protect is off > sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00 > sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't > support DPO or FUA > sd 1:0:0:0: [sdb] 1953525168 512-byte hardware sectors (1000205 MB) > sd 1:0:0:0: [sdb] Write Protect is off > sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00 > sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't > support DPO or FUA > sdb: sdb1 > sd 1:0:0:0: [sdb] Attached SCSI disk > > -------------------------------------------------- > > [root@hugo2 ~]# fdisk /dev/sda > > The number of cylinders for this disk is set to 121601. > There is nothing wrong with that, but this is larger than 1024, > and could in certain setups cause problems with: > 1) software that runs at boot time (e.g., old versions of LILO) > 2) booting and partitioning software from other OSs > (e.g., DOS FDISK, OS/2 FDISK) > > Command (m for help): p > > Disk /dev/sda: 1000.2 GB, 1000204886016 bytes > 255 heads, 63 sectors/track, 121601 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Disk identifier: 0x2ef7934e > > Device Boot Start End Blocks Id System > /dev/sda1 1 121585 976631481 83 Linux > > > Kernel is 2.6.25-14.fc9.i686 and mdadm is mdadm-2.6.4-4.fc9.i386. > > Thanks, > > Richard > -- > 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 > -- 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
