Hitachi Dynamic Link Manager Software Users Guide for Linux
For detailed procedures, see Updating Kernel Packages and Applying OS
Update Packages on page 4-8.
Notes When Using SUSE LINUX Enterprise Server 10
Note the following when your OS is SUSE LINUX Enterprise Server 10:
• 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.
• HDLM devices cannot be used to create an md device.
• If you execute the sync command on the file system that is mounted by
ext3/ReiserFS, the following message is output to syslog, but there is no
problem with HDLM operations.
JBD: barrier-based sync failed on sddlmaa1 - disabling barriers
• If the number of I/O operations that have occurred in the system exceeds
the execution performance of the system (in an environment in which all
of the conditions below exist), the KAPL05008-E message and the call
trace of a kernel might be output.
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Hitachi WMS series exists in HDLM management-target devices.
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In the utility for setting HDLM driver option (dlmsetopt), the number
of retries for allocating memory is set to 0 through 2,147,483,646.
In this case, the system might become unstable, and an error might occur
in the I/O that is being executed. In the dlmsetopt utility, set -1 or a
value greater than the current value for the number of retries for
allocating memory, and then restart the system. If a call trace is output
even after the retry count is set to -1, consider adding memory and
stopping unnecessary processes.
• 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]: scsi_id: unable to access parent device of '/block/
sddlma01'
For a01 in the above examples, any alphanumeric character can be
output.
4-6
HDLM Operation
Hitachi Dynamic Link Manager (for Linux®) User Guide