NAME

       cxl-set-partition - set the partitioning between volatile and persistent capacity on a CXL memdev

SYNOPSIS

       cxl set-partition <mem0> [ [<mem1>..<memN>] [<options>]

DESCRIPTION

       CXL devices may support both volatile and persistent memory capacity. The amount of device capacity set
       aside for each type is typically established at the factory, but some devices also allow for dynamic
       re-partitioning.

       Use this command to partition a device into volatile and persistent capacity. The change in partitioning
       becomes the “next” configuration, to become active on the next device reset.

       Use "cxl list -m <memdev> -I" to examine the partitioning capabilities of a device. A
       partition_alignment_size value of zero means there is no available capacity and therefore the partitions
       cannot be changed.

       Using this command to change the size of the persistent capacity shall result in the loss of data stored.

OPTIONS

       <memory device(s)>
           A memX device name, or a memdev id number. Restrict the operation to the specified memdev(s). The
           keyword all can be specified to indicate the lack of any restriction.

       -S, --serial
           Rather an a memdev id number, interpret the <memdev> argument(s) as a list of serial numbers.

       -t, --type=
           Type of partition, pmem or ram (volatile), to modify. Default: pmem

       -s, --size=
           Size of the <type> partition in bytes. Size must align to the devices alignment requirement. Use cxl
           list -m <memdev> -I to find partition_alignment_size, or, use the --align option. Default: All
           available capacity is assigned to <type>.

       -a, --align
           Select this option to allow the automatic alignment of --size to meet device alignment requirements.
           When using this option, specify the minimum --size of the --type partition needed. When this option
           is omitted, the command fails if --size is not properly aligned. Use cxl list -m <memdev> -I to
           examine the partition_alignment_size.

       -v
           Turn on verbose debug messages in the library (if libcxl was built with logging and debug enabled).

COPYRIGHT

       Copyright © 2016 - 2022, Intel Corporation. License GPLv2: GNU GPL version 2
       http://gnu.org/licenses/gpl.html. This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       cxl-list(1), CXL-2.0 8.2.9.5.2

cxl                                                2024-04-08                               CXL-SET-PARTITION(1)