thin_metadata_size (8)

thin_metadata_size [options]

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 without 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 quantities, 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.

Calculates the thin provisioning metadata device size for block size 64 kilobytes, pool size 1 terabytes and maximum number of thin provisioned 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

thin_metadata_size returns an exit code of 0 for success or 1 for error.

thin_dump(8) thin_check(8) thin_repair(8) thin_restore(8) thin_rmap(8)

Joe Thornber <[email protected]>

Heinz Mauelshagen <[email protected]>