Notes When Using Red Hat Enterprise Linux As4/Es4, Or Oracle Enterprise Linux - Hitachi XP P9500 User Manual

• If all the following conditions are satisfied, even a path in the normal
status might become Offline(E) or Online(E):
¢
¢
¢
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.
• If you start the host when using an HDLM device as a boot disk, the error
message KAPL05023-E might be output to the syslog file. However, HDLM
operations are not affected.
dlmmgr: KAPL05023-E Could not process the IOCTL(0000125F).
(00000000:00000000)
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:
• Before you update the kernel package, uninstall HDLM. After you have
updated the kernel package, re-install HDLM.
For details on HDLM installation and uninstallation, see
page 3-75
• 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
.
b
.
• 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/
block/sddlma01
For a01 in the above examples, any alphanumeric character can be
output.
4-4
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.
and Uninstalling HDLM on page
Unmount any devices mounted on the HDLM device.
Execute the dlmcfgmgr -o command to exclude the HDLM device
from management.
HDLM Operation
Hitachi Dynamic Link Manager User Guide (for Linux(R))
Installing HDLM on
3-216.