User manual HP MULTI-PATH DEVICE MAPPER FOR LINUX SOFTWARE RELEASE NOTES DEVICE MAPPER MULTIPATH ENABLEMENT KIT FOR STORAGEWORKS DISK ARRA

[. . . ] Release Notes Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays Version 4. 0. 0 Part number: AA-RWF9B-TE First edition: February 2008 © Copyright 2008 Hewlett-Packard Development Company, L. P. [. . . ] The multipath feature is provided with combination of DM Multipath kernel modules and multipath-tools user-space package. HPDM Multipath offers the following features: · Detects path failure and automatically reroutes (failover) I/O to an available alternate path, if an existing connection fails · Provides an option to perform failback of the LUN to the repaired paths · Implements failover or failback actions transparently without disrupting applications · Monitors each path and notifies if the path status changes · Facilitates I/O load balancing among the multiple paths · Provides CLI with display options to configure and manage Multipath features · Provides an option to customize names for the HPDM Multipath devices · Provides device name persistence across reboots and/or SAN changes · Provides policy-based path grouping for the user to customize the I/O flow through specific set of paths · Provides online LUN addition and deletion support What's New HPDM Multipath provides the following additional features as part of 4. 0. 0 version: · Provides support for RHEL4. 5/RHEL 4. 6/RHEL 5. 1/SLES 9 SP4/SLES10 SP1 along with RHEL5/SLES9 SP3/SLESS10 OS distributions · Provides support for the HP StorageWorks EVA4400 Disk Arrays · Provides support for HP StorageWorks MSA1000/1500 Disk Arrays · Provides support for HP StorageWorks MSA2000 Product family Disk Arrays (MSA2012fc/MSA2212fc/MSA2012i) · Provides support for XP20000 / 24000 Disk Arrays · Provides support for EVA iSCSI devices on RHEL5/RHEL5. 1/SLES9 SP3/SLES9SP4/SLES10/SLES10 SP1 Documentation Updates The first page of this release notes document contains the following identifying information: · Version number, which indicates the software version. · Date of Publication, which changes each time the document is updated. Installation Notes Installation instructions for the HP Device Mapper Multipath are documented in the installation and reference guide for HP Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays provided in Adobe Acrobat (. pdf) format. Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays 3 NOTE: To view files in PDF format (*. pdf), Adobe Acrobat Reader must be installed on your system. To download Adobe Acrobat Reader, visit the Adobe web site at: http://www. adobe. com Known Issues Following are the known issues of the HPDM Multipath 4. 0. 0: · In SLES OS, the ioctls support is not available on a multipath device created by Device Mapper. As a result, operations such as SCSI inquiry are not supported with HPDM Multipath devices. However does not impact device availability other than a possible I/O delay. [. . . ] · After signing up, you can locate your products by selecting Business support and then Storage under Product Category. 4 In This Version [. . . ]