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() PMDK Programmer's Manual ()

NAME

pmempool-transform - 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>

2024-05-23 PMDK -