pmempool-transform - Man Page
Modify internal structure of a pool set.
Synopsis
pmempool transform [options] <poolset_file_src> <poolset_file_dst>
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), libpmemobj(7), libpmempool(7) and <https://pmem.io>