09-12-2001
Protection
Obviously, RAID is there to protect you from disasters. The various RAID levels present you each a mix of disk space and safety level. If the server is critical I would definatively recommend RAID 1 (mirror disks) on the core OS components.
Upgrading to RAID afterwards will greatly depend on the RAID HW and OS. But usually you have an exhaustive list of 'RAID migration' paths and surely going from no RAID to RAID 1 should be possible.
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LEARN ABOUT HPUX
vxr5check
vxr5check(1M) vxr5check(1M)
NAME
vxr5check - verify RAID-5 volume parity
SYNOPSIS
/etc/vx/bin/vxr5check [-i | -v] [-g diskgroup] volume
DESCRIPTION
The vxr5check utility compares the parity of each stripe of a RAID-5 volume specified by volume. vxr5check reads the data for each stripe,
generates the parity for this stripe, and compares this parity with the existing parity.
vxr5check can be run against the entire RAID-5 volume, or incrementally on RAID-5 stripe boundaries, by specifying the -i option.
OPTIONS
-g diskgroup
Specifies the Veritas Volume Manager (VxVM) disk group name for the RAID-5 volume name for verification. If this option is not
specified, the default disk group is determined using the rules given in the vxdg(1M) manual page.
-i Verifies the RAID-5 volume incrementally per stripes. If a parity mismatch is found, that stripe location is displayed.
-v Verbose output for the incremental vxr5check verification. The verbose option outputs each stripe number that is being verified.
OUTPUT FORMAT
In verbose mode and incremental mode, summary reports for each stripe of the RAID-5 volume are printed in output records. If an error is
returned for a stripe, then an error message and stripe number are displayed. In non-verbose mode, if an error is returned, an error mes-
sage is displayed.
If a parity mismatch error is determined on a stripe, vxr5check exits on that stripe and does not continue for the remaining stripes in the
RAID-5 volume.
FILES
/usr/lib/vxvm/bin/vxr5vrfy The utility that vxr5check calls to perform RAID-5 parity verification operations for the specified RAID-5
volume.
EXIT CODES
The vxr5check utility exits with a non-zero status if the attempted operation fails. A non-zero exit code is not a complete indicator of
the problems encountered, but rather denotes the first condition that prevented further execution of the utility.
See vxintro(1M) for a list of standard exit codes.
NOTES
Do not run vxr5check on a volume that is in degraded mode.
SEE ALSO
vxevac(1M), vxintro(1M), vxmend(1M), vxvol(1M)
VxVM 5.0.31.1 24 Mar 2008 vxr5check(1M)