Physical volume groups | VxVM has no equivalent
feature. The disk group feature of VxVM combines the logical volume
group (VG) and physical volume group (PVG) of LVM. |
Mirror split/fast remerge—this
feature is mainly used for online backups. | Online backup in VxVM
is achieved by capturing a snapshot of a volume. Refer to Table 3-3 “Additional VxVM Tasks with no LVM equivalents” for the command to create a snapshot
copy of a volume. VxFS online backup/snapshot feature provides
similar capability, through the mount command. Mirror
re-merge is not supported at present, but mirrors can be added to
a volume using the vxassist command. Refer to the respective manpages
of commands for more details. |
Powerfail timeout feature: Automatically
re-enable a disk or a path to a disk, after temporary error condition
(resulting in EPOWERF error on I/Os) disappears on that
disk or path. | Powerfail timeout feature:
After the EPOWERF error condition disappears, the reconfiguration
command must be run manually to re-enable the paths and the disks
which were disabled due to EPOWERF error. See the pfto feature in the vxdctl command manual pages for more information. |
Logical Volume Timeout
(LVTO). If LVTO on a logical volume is set to zero, which is the
default, an I/O is retried forever.  | | | |  | NOTE: LVTO is also known
as the lvchange -t value; it is not the same as the pvchange -t value. | | | | |
| VxVM does not support
the LVTO feature. However, VxVM supports the powerfail timeout feature
to handle transient error conditions. VxVM tries an I/O only on
active paths to a disk; hence, it never retries indefinitely. See the
powerfail timeout feature and also refer to the pfto feature in the vxpfto manual pages for more details. |
Bad media block relocation. | VxVM relocates whole subdisks. Smaller
granularity relocation is not supported. The bad block reallocation feature
does not exist in VxVM. |
Printable version
