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Multipath support in EqualLogic arrays does not encompass Storage IO multipathing in the
traditional sense of the term. Multipathing must be handled at the network/NIC bond level.
Refer to the EqualLogic documentation for information about configuring network failover
for EqualLogic SRs/LVMoISCSI SRs.
MPP RDAC Driver Support for LSI Arrays.
XenServer supports the LSI Multi-Path Proxy Driver (MPP) for the Redundant Disk Array Controller (RDAC). By
default this driver is disabled.
To enable the driver:
1. Open a console on the host, and run the following command:
# /opt/xensource/libexec/mpp-rdac --enable
2. Reboot the host.
To disable the driver:
1. Open a console on the host, and run the following command:
# /opt/xensource/libexec/mpp-rdac --disable
2. Reboot the host.
Note:
This procedure must be carried out on every host in a pool.
Managing Storage Repositories
This section covers various operations required in the ongoing management of Storage Repositories (SRs).
Destroying or Forgetting a SR
You can destroy an SR, which actually deletes the contents of the SR from the physical media. Alternatively you
can forget an SR, which allows you to re-attach the SR, for example, to another XenServer host, without removing
any of the SR contents. In both cases, the PBD of the SR must first be unplugged. Forgetting an SR is the equivalent
of the SR Detach operation within XenCenter.
1. Unplug the PBD to detach the SR from the corresponding XenServer host:
xe pbd-unplug uuid=<pbd_uuid>
2. To destroy the SR, which deletes both the SR and corresponding PBD from the XenServer host database and
deletes the SR contents from the physical media:
xe sr-destroy uuid=<sr_uuid>
3. Or, to forget the SR, which removes the SR and corresponding PBD from the XenServer host database but
leaves the actual SR contents intact on the physical media:
xe sr-forget uuid=<sr_uuid>
Note:
It might take some time for the software object corresponding to the SR to be garbage
collected.
Introducing an SR
Introducing an SR that has been forgotten requires introducing an SR, creating a PBD, and manually plugging the
PBD to the appropriate XenServer hosts to activate the SR.