lctl-pool_add(8)

NAME

lctl-pool_add - add OSTs to a named pool

SYNOPSIS

DESCRIPTION

Add one or more OSTs to the pool named POOLNAME in the filesystem named FSNAME. There are several formats that the OSTs can be specified. Simplest is to just specify a list of OST_INDEX numbers or OST names. It is also possible to specify an OST_RANGE expression of the form [START-END] or [START-END/STEP] that adds multiple OSTs with index numbers in the range from START to END (inclusive), optionally skipping every STEP index values.

NOTE: After updating the MGS configuration, this command will wait up to 12s and check if pools are updated on a client, unless the --nowait option is used. If the MGS is on a separate node from the MDS, a Lustre client must be mounted on the MGS node while the lctl commands are being run for this. Otherwise, the client check is skipped.

This named list of OSTs can be used by lfs-setstripe(1) to specify the OSTs on which new files can be created, though it is important to note that the OSTs that make up a specific pool may change over time, and it is the poolname used at creation time that is stored on each file, not necessarily OSTs that are in the current pool. The lfs-find(1) command can locate files that were initially created on the specified poolname. As well, lfs-df(1) can show only the free space or inodes in a named pool. The lfs-quota(1) and lfs-setquota(1) commands can use a pool name to get/set a quota limit for OSTs in the pool.

OPTIONS

-n, --nowait

Do not wait and check if pool is updated on a client. This is useful when calling a lot of 'lctl pool_*' commands in a row, to avoid waiting for each command to complete.

EXAMPLES

Create a pool named flash in the testfs filesystem:

# lfs pool_new testfs.flash

Add OSTs numbered 8, 10, and 12 through 14 to the testfs.flash pool:

# lfs pool_add testfs.flash 8 10 12-14

AVAILABILITY

lctl pool_add is part of the lustre(7) filesystem package since release 1.7.0

SEE ALSO

lfs-df(1), lfs-find(1), lfs-setstripe(1), lustre(7), lctl(8), lctl-pool_new(8)