GPFS日常命令详解.docxVIP

GPFS日常命令详解： mmdeldisk CommandGPFS V3.3 Administration and Programming ReferenceSA23-2221-03 Deletes disks from a GPFS? file system. Synopsis mmdeldisk Device {DiskName[;DiskName...] | -F DescFile} [-a] [-c] [-m | -r | -b] [-N {Node[,Node...] | NodeFile | NodeClass}] Description The mmdeldisk command migrates all data that would otherwise be lost to the remaining disks in the file system. It then removes the disks from the file system descriptor, preserves replication at all times, and optionally rebalances the file system after removing the disks. The mmdeldisk command has the following two functions: Copying unreplicated data off the disks and removing references to the disks (deldisk step). Rereplicating or rebalancing blocks across the remaining disks (restripe step). These two functions can be done in one pass over the file system, or in two passes if the -a option is specified. Run the mmdeldisk command when system demand is low. If a replacement for a failing disk is available, use the mmrpldisk command in order to keep the file system balanced. Otherwise, use one of these procedures to delete a disk: If the file system is replicated, replica copies can be preserved at all times by using the default -r option or the -b option. Using the -m option will not preserve replication during the deldisk step because it will only copy the minimal amount of data off the disk being deleted so that every block has at least one copy. Also, using the -a option will not preserve replication during the deldisk step, but will then re-establish replication during the subsequent restripe step. If you want to move all data off the disk before running mmdeldisk, use mmchdisk to suspend all the disks that will be deleted and run mmrestripefs with the -r or -b option. This step is no longer necessary, now that mmdeldisk does the same function. If mmdeldisk fails (or is canceled), it leaves the disks in the suspended state, and mmdeldisk can be retried when the problem tha