Installation guide

4.6.5.6 The volrootmir Script Supports Only LUN 0 on HSZ
Only LUN 0 is supported as a boot device by the console. Hence, you can
only mirror the LSM rootvol and swapvol volumes to LUN 0 in an
HSZ. Therefore, when you use the volrootmir script to mirror rootvol
and swapvol, use only LUN 0 on an HSZ as an argument to the
volrootmir script.
4.6.5.7 Using LSM rootvol Requires sysconfigtab Parameters
If you use the LSM rootvol volume for the root file system and the
swapvol volume is in use as a primary swap volume, LSM adds the
following entries to the /etc/sysconfigtab file to enable rootability:
lsm:
lsm_rootvol_is_dev=1
lsm_swapvol_is_dev=1
If these entries are deleted or if the /etc/sysconfigtab file is deleted,
the system will not boot. If this happens, you can boot the system
interactively as follows (the "\" character indicates line continuation):
>>> boot -fl i
Enter kernel_name option_1 ... option_n: vmunix \
lsm_rootdev_is_volume=1
Use the sysconfigdb utility to add the LSM entries as shown above to the
/etc/sysconfigtab file after the system boots. Then, reboot the system
for the changes to take effect.
4.6.5.8 Error While Dissociating a Preferred LSM Plex
When using LSM, a preferred plex can not be dissociated from an active
mirrored volume. Attempting to do so will cause the following error:
fsgen/volplex: Unexpected kernel error in configuration update
Before dissociating the plex, change the volume’s read policy so the plex is
no longer the preferred plex. For example:
# volume -g my_diskgroup rdpol round my_volume
# volplex -g my_diskgroup dis my_plex
4.6.5.9 Presto Reset and Flush Operations May Cause System Crash
Due to a problem in the presto driver, avoid using the presto reset and flush
operations (using the command presto -R or presto -F )toflush
presto data. There is a possibility that the system will panic if a presto
reset/flush operation is attempted. A workaround is to perform an orderly
shutdown to flush all data that can be flushed and use the console command
prflush –z to purge any remaining data.
4–40 Base System Software Notes