On 2014-12-05 17:41, Chris Murphy wrote:

You're getting a read error when writing. This is expected when
writing 512 bytes to a 4k sector.

What do you get for
 parted /dev/sdb u s p

Right - so we're getting these:

# parted /dev/sdb u s p
Model: ATA ST3000DM001-9YN1 (scsi)
Disk /dev/sdb: 5860533168s
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number  Start        End          Size         File system  Name  Flags
5 2048s 4095s 2048s bios_grub
 1      4096s        67112959s    67108864s                       raid
 2      67112960s    68161535s    1048576s                        raid
 3      68161536s    2215645183s  2147483648s                     raid
 4      2215645184s  5860533134s  3644887951s  btrfs              raid


--
Tomasz Chmielewski
http://www.sslrack.com

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