Updating Kernel Packages And Applying Os Update Packages - Hitachi XP P9500 User Manual

• 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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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
error message KAPL05023-E might be output to the console or syslog.
However, HDLM operations are not affected.
• When the dlmcfgmgr utility is executed with the -r parameter specified,
the error message KAPL05023-E is output to the syslog file. However,
HDLM operations are not affected.
• Sometimes a hyphen is displayed for the SCSI device name in the Device
column of the results of the dlmcfgmgr utility (dlmcfgmgr -v) or the view
operation of the HDLM command (with either the -lu or -drv parameter
specified). This might happen if one of the problems listed below occurs
while the system is running, even if the SCSI devices are not erased. This
problem is related to the OS's hot-plug function. HDLM operations are not
affected:
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Updating Kernel Packages and Applying OS Update
Packages
When using Red Hat Enterprise Linux 5 or Red Hat Enterprise Linux 6, you
can update kernel packages or apply OS update packages while HDLM is
installed.
4-8
Hitachi WMS exists in HDLM management-target devices.
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.
A path gets disconnected.
An LU is deleted.
A fiber cable connection is changed.
A Fibre Channel switch's zone setting is changed.
HDLM Operation
Hitachi Dynamic Link Manager User Guide (for Linux(R))