HP StorageWorks Scalable File Share - Manual (Page 280)

Troubleshooting 9–56
9.33.2 Recovering from a temporary SFS20 array failure
If an SFS20 array has had a temporary failure such as loss of power or inadvertent disconnection of one of
its UltraSCSI cables, operation can be restored by correcting the failure and rebooting the affected servers.
To recover from a temporary failure of an SFS20 array, perform the following tasks:
1. Correct the cause of the failure (for example, restore power to the array).
2. If the file system is still operational, shut down and reboot each server in turn. For example, if the
array is attached to servers
south3
and
south4
, shut down and boot the servers as follows:
a. Shut down the
south3
server.
b. Boot the
south3
server.
c. Use the
show filesystem
command to check that all MDS and OST services are in either the
running state or the recovering state.
d. Shut down the
south4
server.
e. Boot the
south4
server.
3. Verify that the SFS20 array is operational from both servers, as shown in the following example:
sfs> show array 2
.
.
.
Connected to HBA/Port Status
-------------- ---------- ----------
south3 scsi-1/2 online
south4 scsi-1/2 online
.
.
.
The
Status
field should show a status of
online
for each of the servers.
4. If the MDS or OST service using the SFS20 array was mirrored, follow the instructions provided in
Section 9.33.3 to recover the device.
5. If the MDS or OST service was unable to run because of the temporary failure of the SFS20 array,
stop and restart the file system by entering the
stop filesystem filesystem_name
command
and then entering the
start filesystem filesystem_name
command.
9.33.3 Recovering degraded MDS or OST services
If an MDS or OST service using an SFS20 storage array that temporarily failed was mirrored, the RAID status
of the service may be running in
degraded
mode. The
show filesystem
command displays the state
of the service, as shown in the following example:
sfs> show filesystem
Name State Services
------ -------------- ----------------------------------
data started mds8: running(raid: degraded), ost[29-30]: running
In this example, the
mds8
service is shown to be running in
degraded
mode. This means that one mirror
device is operating normally and the other has failed. You can recover the service and restore it to correct
operation as follows:
1. If the file system is stopped, start the file system.