vxr5check(1m) [hpux man page]
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)
Check Out this Related Man Page
vxstat(1M) vxstat(1M) NAME
vxstat - Veritas Volume Manager statistics management utility SYNOPSIS
vxstat [-CdpPsv ] [-f fields ] [-g diskgroup] [-i interval [ -c count ]] [-n node [,node...]] [-r ] [object...] DESCRIPTION
The vxstat utility prints and resets statistics information on one or more volumes, plexes, subdisks, disks, or cache objects. The vxstat utility reads statistics from the volume device files in the directory /dev/vx/rdsk and prints them to standard output. These statistics represent volume, plex, subdisk, and disk activity since boot time. If no object operands are given, then statistics from all volumes in the configuration database are reported. object can be the name of a volume, plex, subdisk, disk, or cache object. In a Veritas Volume Manager (VxVM) cluster environment, vxstat gathers the requested statistics from all nodes in the cluster, and reports the aggregate totals. You can specify a node list to indicate a subset of nodes from which to gather statistics. OPTIONS
-c count Stops after printing interval statistics count times. -C Displays I/O statistics for the named cache objects (used by space-optimized instant snapshots) including: RD Percentage of reads in the total I/O. WR Non-first (non-allocating) writes in the total I/O. FW First (allocating) writes in the total I/O. RDTIME Moving average of time taken by reads in milliseconds. WRTIME Moving average of time taken by non-first writes in milliseconds. FWTIME Moving average of time taken by first writes in milliseconds. -d Displays statistics for disks on which the object specified on the command line is fully or partially located. -f fields Selects the display of statistics collected. The following options are available: 0 | O Statistics for the VOL_R5_ZERO operation. Each operation represents one call to the VOL_R5_ZERO ioctl. The number of blocks is based on the number of zeroed blocks written to the array. The average time is the time taken to complete the entire ioctl operation. a Statistics on atomic copies performed (has meaning only for mirrored volumes). Displays the number of operations, num- ber of blocks, and the average time spent per operation. b Displays the statistics on read-writeback mirror consistency recovery operations (has meaning only for mirrored vol- umes). Displays three fields: the number of read-writeback operations, the number of blocks involved in read-writeback operations, and the average time for completing a read-writeback operation. While in recovery mode, most read opera- tions to a mirrored volume invoke read-writeback consistency recovery. c Statistics on corrected (fixed) read operations (has meaning only for mirrored or RAID-5 volumes). Displays the number of fixed read and write operations. Note: Currently, only read operations are ever corrected, so the number of fixed writes will always be zero. C Statistics for the VOL_R5_RECOVER operation. Each operation count represents one call to the VOL_R5_RECOVER ioctl. The number of blocks represents the resulting number of blocks that were written to the missing column region as part of the data recovery. The read operations are not counted towards the total. e Displays statistics for extended copy operations on volumes including: OPS The number of extended copy operations performed. BLOCKS The number of blocks copied. AVG The average time taken per operation in milliseconds. f The number of failed read and write operations. F Statistics for full-stripe writes on RAID-5 volumes. The number of operations represents the number of write opera- tions within a stripe that were conducted as a full-stripe write optimization. Full-stripe writes represent consider- ably less overhead than read-modify-writes in terms of overall I/O time, latency and CPU overhead. The total number of blocks represents the total size of the written data and the average time is the time taken for a full-stripe write operation. Since the I/O may be larger then a single stripe, more than one stripe operation may be seen for a single logical I/O request. M Read-modify-write statistics for RAID-5 volumes. Each operation represents a read-modify write operation performed within a stripe. I/O crossing a stripe boundary will be represented by more than a single read-modify write operation. The number of blocks counted represents only the size of the requested write. The read portion of the I/O can be derived. o Reads from source volumes that satisfy attempted reads from incomplete instant snapshots. p Pushed writes of original data to incomplete instant snapshots. These writes are caused by attempted writes to the source volumes. r Resync writes of original data to incomplete instant snapshots. These writes are caused by background synchronization operations rather than by pushed writes. R Reconstruct read operations for RAID-5 volumes. Each operation is a separate reconstruct read operation. A single stripe read or write operation can lead to numerous reconstruct read operations. s Statistics on read and write operations. Displays six fields: the number of read operations, the number of write operations, the number of blocks read, the number of blocks written, the average time spent on read operations in the interval, and the average time spent on write operations in the interval. These statistics are displayed as the default output format. S Statistics for the VOL_R5_RESYNC operation. Each operation count represents one call to the VOL_R5_RESYNC ioctl. The number of blocks represents the resulting number of blocks that were written to the parity regions as part of the resynchronization of par- ity. The read operations are not counted towards the total. v Statistics on verified reads and writes (has meaning only for mirrored volumes). Displays six fields: the number of verified read operations, the number of verified write operations, the number of blocks read, the number of blocks written, the average time spent on verified read operations in the interval, and the average time spent on verified write operations in the interval. V Statistics for the VOL_R5_VERIFY operation. Each operation count represents one call to the VOL_R5_VERIFY ioctl. The number of blocks represents the resulting number of blocks that were read as part of the RAID-5 stripes consistency verification. W Reconstruct write statistics for RAID-5 volumes. Each operation counted is for a reconstruct write operation performed as an optimization of a write operation within a stripe. The number of blocks counted represents the count of data blocks written not including parity or read operations. -g diskgroup Selects records from the specified disk group. The diskgroup option argument can be either a disk group name or disk group ID. -i interval Prints the change in volume statistics that occurs after every interval seconds. The first interval is assumed to encompass the entire previous history of objects. Subsequent displays will show statistics with a zero value if there has been no change since the previous interval. -n node[,node...] Gathers and displays statistics for the nodes specified in node, where node is a comma separated list of integer node numbers. -p Displays statistics for plexes on the object specified on the command line. For subdisk objects, displays information about a plex with which it is associated. -P Displays statistics for the paging module that is used by the instant snapshot feature: INVALIDATIONS Number of pages whose contents have been invalidated for some reason. REPLACEMENTS Number of pages stolen to satisfy a new request. HITS Number of client requests that were satisfied from in-core pages. MISSES Number of client requests that could not be satisfied from the in-core pages, and which required the contents to be read from disk. -r Resets statistics instead of printing them. This option follows the same selection rules as printing for any type selection arguments or for any named objects. If an interval was specified on the command line, then the first set of statistics will not be printed since they will have been reset to zero. Subsequent activity will cause printing of statistics as normal. -s Displays statistics for subdisks on the objects specified on the command line. -v Displays statistics for volumes on the objects specified on the command line. For an object that is a plex or a subdisk, dis- plays information about the volume with which the object is associated. If an object supplied is a disk, then any volumes that occupy any part of the disk will be selected. OUTPUT FORMAT
Summary statistics for each object are printed in one-line output records, preceded by two header lines. The output line consists of blank-separated fields for the object type, object name (standard), and the fields requested by the -f switch in the order they are speci- fied on the command line. If the -i interval option was supplied, then statistics will be prefaced with a time-stamp showing the current local time on the system. EXIT CODES
The vxstat 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. EXAMPLES
To display statistics for all subdisks associated with all volumes, use the command: vxstat -s To display statistics for the plexes and subdisks of a volume named blop, use the following: vxstat -ps blop To reset all statistics for a disk group named foodg, type the following command: vxstat -g foodg -r To display 5 sets of disk statistics at 10 second intervals, use the following: vxstat -i 10 -c 5 -d SEE ALSO
vxintro(1M), vxtrace(1M), vxtrace(7) VxVM 5.0.31.1 24 Mar 2008 vxstat(1M)