Hitachi Dynamic Link Manager Software Users Guide for Linux
• If all the following conditions are satisfied, even a path in the normal
status might become Offline(E) or Online(E):
¢
A storage system that has a SATA drive is being used.
¢
There is a heavy I/O load on the storage system.
¢
Path health checking is set to ON.
If this problem happens, reduce the I/O load, and then return the path
status to Online by performing an online operation.
• Although the following messages are output when you load the alert
driver and the filter driver respectively, HDLM operations are not affected.
sddlmadrv: unsupported module, tainting kernel.
sddlmadrv: module license 'Proprietary: Contact Hitachi for any
bugs' taints kernel.
• Paths for which a value equal or greater than 0000000000000100 is
displayed for the target ID (hexadecimal number) in PathName as a result
of executing the dlnkmgr command's view operation (with either the-
path or -lu parameter specified) are the paths whose status changes to
Offline(E) because the host was restarted while an error occurred with
some paths.
The status of such Offline(E) paths is not changed to online by using
the online command or the automatic failback function. To change the
status of such paths to online, execute the dlmcfgmgr utility (dlmcfgmgr
-r).
Notes When Using Red Hat Enterprise Linux AS4/ES4, or Oracle
Enterprise Linux 4
Note the following when your OS is Red Hat Enterprise Linux AS4/ES4, or
Oracle Enterprise Linux 4:
• To update a kernel package or apply an OS update package, remove
HDLM first. Perform the update and then install HDLM again.
For detailed procedures, see
Updating Kernel Packages and Applying OS
Update Packages on page 4-8.
• SCSI devices corresponding to an HDLM device can be removed
dynamically even while the HDLM device is in use. Before doing so,
perform the following operations:
a. Unmount any devices mounted on the HDLM device.
b. Execute the dlmcfgmgr -o command to exclude the HDLM device
from management.
• When a device is dynamically configured by using the udev function, the
messages shown below might be output to the console or syslog.
However, HDLM operations are not affected.
Output example:
scsi_id[a01]: Cannot find sysfs device associated with /sys/
4-4
HDLM Operation
Hitachi Dynamic Link Manager (for Linux®) User Guide