GPFS: Administration and Programming Reference - IRA Home

- The local cluster no longer needs to be shut down prior to changing security keys. This enables
online management of security keys, for example:
v In order to make connection rate performance acceptable in large clusters, the size of the
security keys used for authentication cannot be very large. As a result, it may be necessary to
change security keys in order to prevent a given key from being compromised while it is still in
use.
v As a matter of policy, some institutions may require security keys are changed periodically.
– Enhancement to the mmbackup command to permit specifying a sort directory, using the -s flag.
– Enhancement to the mmlsattr command to display additional file attributes (including the fileset,
storage pool, and snapshot), using the -L flag.
– Enhancement to the mmlsdisk command to display information about how disk I/O requests are
satisfied (locally or using an NSD server), with the -M and -m flags.
– Enhanced error messages reporting in the mmfs log. Messages previously reporting no explanation
now provide the proper text.
– You may experience performance improvements when issuing either the mmlsnsd -M or the
mmlsnsd -m command due to a redesign of the command.
v Deleted information:
– The mmpmon command no longer uses a network connection for communication with the GPFS
daemon.
Summary of changes
for GPFS Version 3.1 library
as updated, April 2006
Changes to the GPFS library for this release include:
v New information:
– The General Parallel File System: Advanced Administration Guide has been introduced. The guide
contains:
- Shared file system access
- Policy-based data management
- Creating and maintaining snapshots
- Disaster recovery
- Monitoring GPFS I/O performance
- Miscellaneous topics, including SANergy ®
– For the General Parallel File System: Concepts, Planning, and Installation Guide:
- Information about new configuration and tuning parameters.
– For the General Parallel File System: Administration and Programming Reference:
- New information needed to administer the new GPFS functions listed previously.
- New entries for the commands and subroutines listed previously.
– For the General Parallel File System: Problem Determination Guide:
- New messages for the new functions listed previously.
- New problem determination sections for the new functions listed previously.
– For the General Parallel File System: Data Management API Guide:
- No new information.
v Changed information:
– For the General Parallel File System: Concepts, Planning, and Installation Guide:
- Quorum semantics
- Installation instructions
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