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Determine if a device is compatible with IO multipathing.

Subject:

How to determine if a device will support multipathing.

 

Detail:

You can run the `qs-iofence devstatus` command to run a report on a disks compatibility for multipathing.

Also when purchasing disks you can run the below command when you install the drives to ensure they support multiple ports prior to connecting and configuring them for multipathing so that you can be sure they are compatible.

# sg_inq --page=0x88 /dev/DISK

If this page comes back empty, or with an erro, then the disks do not support multipathing. A disk that does support multipathing would report two ports as shown in the example below:
*
root@HA-CIB-305-3-27-A:~# sg_inq --page=0x88 /dev/sde
VPD INQUIRY: SCSI Ports page
Relative port=1
Target port descriptor(s):
Designation descriptor number 1, descriptor length: 12
transport: Serial Attached SCSI Protocol (SPL-2)
designator_type: NAA, code_set: Binary
associated with the target port
NAA 5, IEEE Company_id: 0xc50
Vendor Specific Identifier: 0x8e75a719
[0x5000c5008e75a719]
Relative port=2
Target port descriptor(s):
Designation descriptor number 1, descriptor length: 12
transport: Serial Attached SCSI Protocol (SPL-2)
designator_type: NAA, code_set: Binary
associated with the target port
NAA 5, IEEE Company_id: 0xc50
Vendor Specific Identifier: 0x8e75a71a
[0x5000c5008e75a71a]

 

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