On Thu, 2014-01-30 at 21:08 +0000, Richard Gomes wrote: > [ 3rd time I'm trying to post this! :( This Majordomo sucks :( ] > > Hello, > > I have /dev/sda and /dev/sdb in RAID1. > > I've discovered that I can boot from partition /dev/sda1 but not from > /dev/sdb1. > > Apparently, both disks have equivalent partition tables: > > # sfdisk -l /dev/sda > > Disk /dev/sda: 121601 cylinders, 255 heads, 63 sectors/track > Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting > from 0 > > Device Boot Start End #cyls #blocks Id System > /dev/sda1 * 0+ 60- 61- 487424 fd Linux raid > autodetect > /dev/sda2 60+ 7841- 7781- 62499840 fd Linux raid > autodetect > /dev/sda3 7841+ 121601- 113760- 913773568 fd Linux raid > autodetect > /dev/sda4 0 - 0 0 0 Empty > > > # sfdisk -l /dev/sdb > > Disk /dev/sdb: 121601 cylinders, 255 heads, 63 sectors/track > Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting > from 0 > > Device Boot Start End #cyls #blocks Id System > /dev/sdb1 * 0+ 60- 61- 487424 fd Linux raid > autodetect > /dev/sdb2 60+ 7841- 7781- 62499840 fd Linux raid > autodetect > /dev/sdb3 7841+ 121601- 113760- 913773568 fd Linux raid > autodetect > /dev/sdb4 0 - 0 0 0 Empty > > > > But /parted/ tells me a different story. > This is the culprit: /dev/sdb1 is not known as ext4, as it should be. > > # parted -l > Model: ATA ST1000DM003-9YN1 (scsi) > Disk /dev/sda: 1000GB > Sector size (logical/physical): 512B/4096B > Partition Table: msdos > > Number Start End Size Type File system Flags > 1 1049kB 500MB 499MB primary ext4 boot, raid > 2 500MB 64.5GB 64.0GB primary raid > 3 64.5GB 1000GB 936GB primary raid > > > Model: ATA ST1000DM003-9YN1 (scsi) > Disk /dev/sdb: 1000GB > Sector size (logical/physical): 512B/4096B > Partition Table: msdos > > Number Start End Size Type File system Flags > 1 1049kB 500MB 499MB primary boot, raid > 2 500MB 64.5GB 64.0GB primary raid > 3 64.5GB 1000GB 936GB primary raid As far as I know, the flags are redundant to a degree; although they "may" be used as a hint. Making a drive bootable requires a boot sector loader of some form (as mentioned in Roberts post). If you can output the result of cat /proc/mdstat and also the mdadm outputs as suggested by Robert then a more informed response can be given. > > > What would be a recommended way to fix this issue? > > Thanks -- 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
