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Operating Systems AIX AIX 5.3 MPIO vs RDAC on DS4000 range Post 302244739 by shockneck on Wednesday 8th of October 2008 01:49:40 PM
Old 10-08-2008
MPIO is part of the AIX 5.3 OS. It provides access to volumes through multiple physical paths while those devices appear as single hdisks. Supported policies are failover or round-robin but no load balancing. The latter is added by SDDPCM. However, with DS4K you are bound to use RDAC. SDDPCM can be used with DS6K and DS8K only.
 

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fsapadm(1M)															       fsapadm(1M)

NAME
fsapadm - VxFS allocation policy administration utility SYNOPSIS
metadata_policy_name flags] filename data_policy_name metadata_policy_name flags] order] mount_point policy_name volname... DESCRIPTION
The utility performs administrative tasks, such as assigning, defining, deleting, and enforcing allocation policies in a specified VERITAS File System. policy_name specifies the name of an allocation policy. The maximum length of an allocation policy name is 64 characters. mount_point specifies the directory on which the file system is mounted. Keywords Assigns allocation policies to a Storage Checkpoint. Assigns allocation policies to an individual file. Possible values for flags are: Set this flag on a directory and subsequently the files created in the directory will inherit the allocation policies. Assigns the default allocation policies for an entire file system. Defines a new allocation policy or changes an existing allocation policy named policy_name at the specified mount point. In the latter case, the previously specified volumes are replaced by the newly specified volumes. Possible values for order are: Allocations are done from the volume in the order in which they are given in the allocation policy. Allocations are done from the volume specified in the allocation policy that has the most free blocks. Allocations are done from a volume that is selected in a round-robin fashion from those specified in the allocation policy. The default order is Possible values for flags are: Allows non-privileged users to be able to assign the policy using the keyword. By default, only privileged users can assign policies. Deletes an allocation policy. Enforces the allocation policies assigned to an individual file by moving any data and metadata that does not fulfill its assigned allocation policy into new blocks that do fulfill its assigned allocation policy. Displays the definitions of all allocation policies defined in a file system. Displays the definition of an allocation policy. Displays the allocation policies assigned to an entire file system. Displays the allocation policies assigned to a Storage Checkpoint. Displays the allocation policies assigned to an individual file. EXAMPLES
The following command defines an allocation policy named using volumes and with order in the file system mounted at The following command deletes the allocation policy named from the file system mounted at The following command displays the definition of the allocation policy named in the file system mounted at The following command assigns the allocation policies named and as the default policies for data and metadata, respectively, for all files in the file system mounted at The following command assigns the allocation policy named as the default policy for data and metadata, respectively, for the Storage Check- point in the file system mounted at The following command assigns the allocation policy named for data and metadata, respectively, to the file The following command displays the allocation policies assigned as the defaults for all files in the file system mounted at The following command displays the allocation policies assigned to the Storage Checkpoint in the file system mounted at The following command displays the allocation policies assigned to the file in the file system mounted at The following command enforces the allocation policies assigned to the file in the file system mounted at (that is, the existing alloca- tions are moved to match the policies, if required): SEE ALSO
fsadm_vxfs(1M), fsckptadm(1M), fsvoladm(1M). fsapadm(1M)
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