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I use multipath on 64Bit Ubuntu. If I do multipath -ll it finds my devices, but reports them as 2.0TB instead of the 4.8T they should be. Any idea why this is the case?

Example output:

36000d77a0000974f6367a370c8e09342dm-3 FALCON  ,IPSTOR DISK
\\_ round-robin 0 [prio=1][active]
 \\_ 1:0:2:2 sdr 65:16 [active][ready]
\\_ round-robin 0 [prio=1][enabled]
 \\_ 0:0:2:2 sdi 8:128 [active][ready]
\\_ round-robin 0 [prio=1][enabled]
 \\_ 0:0:3:2 sdl 8:176 [active][ready]
\\_ round-robin 0 [prio=1][enabled]
 \\_ 1:0:1:2 sdo 8:224 [active][ready]
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closed as too localized by Chris S Feb 13 '12 at 18:55

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This has been answered on askubuntu already. Your partitioning is the problem, use GPT or don't partition at all. The later can sometimes lead to UDEV problems, it's considered "best practices" to partition your block devices even when they span the entire disk.

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It's a while back, but I'm pretty sure I used GPT. – user53747 Feb 9 '12 at 0:12
Strictly speaking, it's impossible to address more than 2TB using partitions that are not GPT based, or you're not using partitions at all, which has it's own problems. You could have also had both GPT and residual MBR installed. You never actually stated that you were unable to address higher than 2TB only that it was reporting no more than 2TB. In either case, since MP just passes bdevs through, once a partition table was read, it would be real clear if the mapping multipath created disagreed with the partitioned size or the report from READ CAPACITY. – ppetraki Feb 13 '12 at 18:08

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