Using multipath storage devices
Depending on your environment, support for multipath storage devices might have some restrictions.
AIX®
- Harvested
IBM.AgFileSystem
resources can be automated.IBM.AgFileSystem
resources are harvested if they are of typejfs
orjfs2
and reside on storage entities that are harvested themselves (storage entities of classIBM.LogicalVolume
,IBM.VolumeGroup
,IBM.Disk
). - User-defined
IBM.AgFileSystem
resources can be automated (for example, network file systems). - SCSI-2 reservation is supported for SPIO and MPIO storage devices using the Redundant Disk Array Controller (RDAC) driver.
- No striping
- User-defined
IBM.AgFileSystem
resources can only be automated if the disk hosting the file system has the same device name on all nodes of the cluster.
Linux on POWER® and Linux on System x
- Harvested
IBM.AgFileSystem
resources can be automated.IBM.AgFileSystem
resources are harvested if they are of typeext2
,ext3
, orreiserfs
and reside on storage entities that are themselves harvested (storage entities of classIBM.LogicalVolume
,IBM.Partition
,IBM.VolumeGroup
,IBM.Disk
. - User-defined
IBM.AgFileSystem
resources can be automated (for example, network file systems). - SCSI-2 reservation is supported for disks harvested from the RDAC driver.
- Linux® RAID (/dev/device mapper
provided or
md
devices) is supported. - Device mapper managed disks are supported.
- File systems created on device mapper provided or md devices without using LVM are not
harvested, they can only be automated using user-defined
IBM.AgFileSystem
resources. - device mapper provided or md devices themselves are only harvested as
IBM.Disk
resources if a physical volume has been created on the md device using the pvcreate command. - SCSI-2 reservation is not supported for non-RDAC drivers or for device mapper provided or md devices themselves.
- User-defined
IBM.AgFileSystem
resources can only be automated if the disk hosting the file system has the same device name on all nodes of the cluster. - EVMS is not supported, which includes any Volume Groups/Logical Volumes created or managed by EVMS.
- For SLES 12/15 and RHEL 7/8, harvesting of storage entities of class IBM.Disk, IBM.VolumeGroup, IBM.LogicalVolume, IBM.Partition, and IBM.AgFileSystem are supported. File systems may be automated if the limitations for device mapper provided or md devices listed above are met.
Linux on System z®
Device mapper provided or md devices are harvested as IBM.Disk
resources if a
physical volume has been created on the provided block device using the
pvcreate
command. This is independent of the underlying disk technology, ECKD or SCSI.
- Only user-defined
IBM.AgFileSystems
resources orIBM.AgFileSystems
resources residing on harvested device mapper provided or md devices can be automated. Resource harvesting for other disks is not supported. Even if harvesting of other disk resources is successful, the harvested resources cannot be automated. - User-defined
IBM.AgFileSystems
resources can only be automated if the disk hosting the file system has the same device name on all nodes of the cluster. - SCSI reservation is not supported.