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thin_metadata_size(8) [centos man page]

THIN_METADATA_SIZE(8)					      System Manager's Manual					     THIN_METADATA_SIZE(8)

NAME
thin_metadata_size - thin provisioning metadata device/file size calculator. SYNOPSIS
thin_metadata_size [options] DESCRIPTION
thin_metadata_size calculates the size of the thin provisioning metadata based on the block size of the thin provisioned devices, the size of the thin provisioning pool and the maximum number of all thin prisioned devices and snapshots. Because thin provisioning pools are holding widely variable contents, this tool is needed to provide sensible initial default size. -b, --block-size BLOCKSIZE[bskKmMgGtTpPeEzZyY] Block size of thin provisioned devices in units of bytes,sectors,kilobytes,kibibytes,... respectively. Default is in sectors with- out a block size unit specifier. Size/number option arguments can be followed by unit specifiers in short one character and long form (eg. -b1m or -b1megabytes). -s, --pool-size POOLSIZE[bskKmMgGtTpPeEzZyY] Thin provisioning pool size in units of bytes,sectors,kilobytes,kibibytes,... respectively. Default is in sectors without a pool size unit specifier. -m, --max-thins #[bskKmMgGtTpPeEzZyY] Maximum sum of all thin provisioned devices and snapshots. Unit identifier supported to allow for convenient entry of large quanti- ties, eg. 1000000 = 1M. Default is absolute quantity without a number unit specifier. -u, --unit {bskKmMgGtTpPeEzZyY} Output unit specifier in units of bytes,sectors,kilobytes,kibibytes,... respectively. Default is in sectors without an output unit specifier. -n, --numeric-only [short|long] Limit output to just the size number with the optional unit specifier character/string. -h, --help Print help and exit. -V, --version Output version information and exit. EXAMPLES
Calculates the thin provisioning metadata device size for block size 64 kilobytes, pool size 1 terabytes and maximum number of thin provi- sioned devices and snapshots of 1000 in units of sectors with long output: thin_metadata_size -b64k -s1t -m1000 Or (using the long options instead) for block size 1 gigabyte, pool size 1 petabytes and maximum number of thin provisioned devices and snapshots of 1 million with numeric only output in units of gigabytes: thin_metadata_size --block-size=1g --pool-size=1p --max-thins=1M --unit=g --numeric-only Same as before (1g,1p,1M,numeric-only) but with unit specifier character appended: thin_metadata_size --block-size=1giga --pool-size=1petabytes --max-thins=1mebi --unit=g --numeric-only=short Or with unit specifier string appended: thin_metadata_size --block-size=1giga --pool-size=1petabytes --max-thins=1mebi --unit=g -nlong DIAGNOSTICS
thin_metadata_size returns an exit code of 0 for success or 1 for error. SEE ALSO
thin_dump(8) thin_check(8) thin_repair(8) thin_restore(8) thin_rmap(8) AUTHOR
Joe Thornber <ejt@redhat.com> Heinz Mauelshagen <HeinzM@RedHat.com> Red Hat, Inc. Thin Provisioning Tools THIN_METADATA_SIZE(8)

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BLOCKDEV(8)						       System Administration						       BLOCKDEV(8)

NAME
blockdev - call block device ioctls from the command line SYNOPSIS
blockdev [-q] [-v] command [command...] device [device...] blockdev --report [device...] DESCRIPTION
The utility blockdev allows one to call block device ioctls from the command line. OPTIONS
-V Print version and exit. -q Be quiet. -v Be verbose. --report Print a report for the specified device. It is possible to give multiple devices. If none is given, all devices which appear in /proc/partitions are shown. Note that the partition StartSec is in 512-byte sectors. COMMANDS
It is possible to give multiple devices and multiple commands. --flushbufs Flush buffers. --getalignoff Get alignment offset. --getbsz Print blocksize in bytes. --getdiscardzeroes Get discard zeroes support status. --getfra Get filesystem readahead in 512-byte sectors. --getiomin Get minimum I/O size. --getioopt Get optimal I/O size. --getmaxsect Get max sectors per request --getpbsz Get physical block (sector) size. --getra Print readahead (in 512-byte sectors). --getro Get read-only. Print 1 if the device is read-only, 0 otherwise. --getsize64 Print device size in bytes. --getsize Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option. --getss Print sectorsize in bytes - usually 512. --getsz Get size in 512-byte sectors. --rereadpt Reread partition table --setbsz bytes Set blocksize. Note that the block size is specific to the current file descriptor opening the block device, so the change of block size only persists for as long as blockdev has the device open, and is lost once blockdev exits. --setfra sectors Set filesystem readahead (same like --setra on 2.6 kernels). --setra sectors Set readahead (in 512-byte sectors). --setro Set read-only. --setrw Set read-write. AUTHOR
blockdev was written by Andries E. Brouwer and rewritten by Karel Zak. AVAILABILITY
The blockdev command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux August 2010 BLOCKDEV(8)
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