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IBM United States Software Announcement

210-034

IBM is a registered trademark of International Business Machines Corporation

Note: Refer to the GPFS FAQs available from the following Web site for more

information, including example configurations and license definitions regarding the

new GPFS Server and GPFS Client model.

http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/index.jsp? topic=/com

GPFS for Windows Multiplatform now supports the Windows Server 2008 operating

system running on 64-bit architectures (AMD x64, Intel® 64). GPFS on Windows

participates in a new or existing GPFS cluster (Version 3.2.1.5, or later) in

conjunction with AIX and Linux (32- or 64-bit) operating systems. GPFS does not

support homogeneous Windows clusters. GPFS V3.3 support is limited to Windows

Server 2008.

Administration improvements include:

• The scope of password-less remote shell command execution is now reduced.

GPFS can now be configured so that password-less remote shell execution is not

required between all nodes. Prior to GPFS V3.3, GPFS had to be configured so

that all nodes can run commands on other nodes via a remote shell without being

prompted for a password. GPFS V3.3 can be configured so that only the terminal

session where a GPFS administrative command is being executed has to be able

to execute remote shell commands on other nodes without being prompted for

a password. All other nodes in the cluster do not have to have the ability to run

password-less commands everywhere else.

• GPFS for Linux improves the build process for the GPFS portability layer by:

– Eliminating the dependency on the imake utility through the use of the kernel

Kbuild infrastructure

– Optionally generating an RPM package containing the GPFS portability layer

binaries to facilitate the installation process

• Users are now allowed to define custom commands to be executed after certain

GPFS events. The administrator can use the mmaddcallback command to register

a user exit script, the mmdelcallback command to delete a user exit script, and

the mmlscallback command to list all the callback scripts currently registered in

the GPFS configuration.

Performance and scaling improvements include:

• The limit on the number of snapshots per file system has been raised from 32 to

256.

• Performance enhancements have been made to the mmrestripefs, mmfsck, and

mmcheckquota commands, and directory locking for concurrent file creates and

deletes from multiple nodes.

• GPFS V3.3 adds support for the Linux AIO APIs io_submit and io_getevents (pread

and pwrite only) for workloads that open files using the O_DIRECT flag when the

file system is created on local disks.

Policy improvements include several enhancements to the GPFS mmapplypolicy

command and the associated GPFS SQL-based policy language:

• A new command option (-g) is provided to enable a fully parallelized (multi-node

and multi-threaded) directory traversal and faster metadata scan with policy rule

set evaluation.

• When invoked with the new (-g) option, mmapplypolicy can tolerate and recover

from faults in individual nodes.

• New command options and policy language extensions allow finer control and

customization of the generation of the file lists and the execution of the user

scripts associated with the EXTERNAL POOL and EXTERNAL LIST features of the

policy language. File lists can be generated by the mmapplypolicy command,

generated or manipulated by user programs, and input to the mmapplypolicy

command for execution.

• The policy language now provides for access to Posix and Windows file attributes

and to extended attributes.

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