NAME

       pmempool-transform - Modify internal structure of a pool set.

SYNOPSIS

              pmempool transform [options] <poolset_file_src> <poolset_file_dst>

NOTE

              NOTICE:  The  libpmemblk  and libpmemlog libraries are deprecated since PMDK 1.13.0
              release.

DESCRIPTION

       The pmempool transform command modifies internal structure of a pool set  defined  by  the
       poolset_file_src file, according to a structure described in the poolset_file_dst file.

       The following operations are supported:

       • adding  replicas  -  one  or  more new replicas can be added and synchronized with other
         replicas in the pool set,

       • removing replicas - one or more replicas can be removed from the pool set ,

       • adding or removing pool set options.

       Only one of the above operations can be performed at a time.

       Currently  adding  and  removing  replicas  are  allowed  only  for  pmemobj  pools   (see
       libpmemobj(7)).

       The poolset_file_src argument provides the source pool set to be changed.

       The poolset_file_dst argument points to the target pool set.

   Available options:
       -d, --dry-run
              Enable dry run mode.  In this mode no changes are applied, only check for viability
              of the operation is performed.

       -v, --verbose
              Increase verbosity level.

       -h, --help
              Display help message and exit.

EXAMPLES

   Example 1.
       Let files /path/poolset_file_src and /path/poolset_file_dst have the following contents:

              PMEMPOOLSET
              20M /0/partfile1
              20M /0/partfile2
              25M /0/partfile3
              REPLICA
              40M /1/partfile1
              20M /1/partfile2

              PMEMPOOLSET
              20M /0/partfile1
              20M /0/partfile2
              25M /0/partfile3
              REPLICA
              40M /1/partfile1
              20M /1/partfile2
              REPLICA
              50M /2/partfile1
              20M /2/partfile2

       Then, the command

       pmempool transform /path/poolset_file_src /path/poolset_file_dst

       adds a replica to the pool set.  All other replicas remain unchanged and the size  of  the
       pool remains 60M.

   Example 2.
       Let files /path/poolset_file_src and /path/poolset_file_dst have the following contents:

              PMEMPOOLSET
              20M /0/partfile1
              20M /0/partfile2
              25M /0/partfile3
              REPLICA
              40M /1/partfile1
              20M /1/partfile2

              PMEMPOOLSET
              20M /0/partfile1
              20M /0/partfile2
              25M /0/partfile3

       Then

       pmempool_transform /path/poolset_file_src /path/poolset_file_dst

       deletes the second replica from the pool set.  The first replica remains unchanged and the
       size of the pool is still 60M.

SEE ALSO

       pmempool(1), libpmemblk(7), libpmemlog(7), libpmempool(7) and <https://pmem.io>