Linux – cannot create zfs pool on iscsi multipath drives

iscsilinuxzfs

I have a disk on iSCSI SAN, which i have mounted on my server through multipath. when i run the command to create zfs pool using

zpool create -f zfs-data /dev/sdc

or 

zpool create -f zfs-data /dev/sdd  (as the disk is mounted on both sdc and sdd)

i get error:

cannot open '/dev/sdc1': Device or resource busy
cannot create 'zfs-data': one or more vdevs refer to the same device, or one of
the devices is part of an active md or lvm device

The fdisk -l gives this output:

Disk /dev/mapper/eql-0-8a0906-f10764e0b-590d2ef939e523ac_b: 107.4 GB, 107379425280 bytes
256 heads, 63 sectors/track, 13003 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

                                                Device Boot      Start         End      Blocks   Id  System
/dev/mapper/eql-0-8a0906-f10764e0b-590d2ef939e523ac_bp1               1       13004   104862719+  ee  GPT

WARNING: GPT (GUID Partition Table) detected on '/dev/mapper/eql-0-8a0906-f10764e0b-590d2ef939e523ac-novaplesk'! The util fdisk doesn't support GPT. Use GNU Parted.

ZFS pool cannot be created on multipathed devices?

Best Answer

You may be getting sdc and sdd, but you need to work with the multipath device created over them. What's your output for 'multipath -ll'? e.g., I have four paths here: 

dbslave2-mysql (36090a028c039386000104572042da1b0) dm-3 EQLOGIC,100E-00
size=550G features='1 queue_if_no_path' hwhandler='0' wp=rw
-+- policy='round-robin 0' prio=1 status=active
|- 6:0:0:0 sdf 8:80 active ready running
|- 9:0:0:0 sde 8:64 active ready running
|- 8:0:0:0 sdc 8:32 active ready running
`- 7:0:0:0 sdd 8:48 active ready running`

So I work with /dev/mapper/dbslave2-mysql, not with sdc, sdd, sde, or sdf. In your case, it looks like you'd use /dev/mapper/eql-0-8a0906-f10764e0b-590d2ef939e523ac_b in your zpool creation commands.

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