SANworks by Compaq Release Notes – Data Replication Manager HSG80 ACS Version 8.6-4P Part Number: AA-RPJ2C-TE Third Edition (February 2002) Product Version: ACS Version 8.6-4P This document provides information for SANworksTM Data Replication Manager by Compaq (operating with HSG80 Array Controller Software Version 8.6-4P) that is not covered elsewhere in the documentation. Individuals responsible for configuring, installing, and using the Data Replication Manager solution should use this document.
© 2002 Compaq Information Technologies Group, L.P. Compaq, the Compaq logo, SANworks, StorageWorks, Tru64, and OpenVMS are trademarks of Compaq Information Technologies Group, L.P. in the U.S. and/or other countries. Microsoft, Windows, and Windows NT are trademarks of Microsoft Corporation in the U.S. and/or other countries. UNIX is a trademark of The Open Group in the U.S. and/or other countries. All other product names mentioned herein may be trademarks of their respective companies.
Release Notes Contents Release Notes Contents These release notes cover the following major topics: • “Intended Audience,” page 4 • “What’s New,” page 4 — “Heterogeneous Open SAN Environment,” page 5 — “Supported Operating Systems,” page 5 — “Switch Configurations,” page 6 — “Fibre Channel SAN Switch V2.
Intended Audience — “Intermittent Double Normalization After a Full Failback or Failback To New Hardware Procedure,” page 13 — “Intermittent Double Normalization After a Full Failback or Failback To New Hardware Procedure,” page 13 — “Command Scripter Communication Loss Due To SCSI Error,” page 13 — “Waiting for Write History Logging Disks,” page 13 — “Association Sets,” page 14 • “Platform-Specific Issues,” page 14 — “Compaq OpenVMS,” page 15 — “Compaq TRU64 UNIX,” page 14 — “Hewlett-Packard HP-UX,” page
What’s New http://www.compaq.com/products/storageworks/softwaredrivers/acs/index.html Customers are encouraged to install the patches for their specific content as required. Heterogeneous Open SAN Environment Compaq’s heterogeneous Open SANs now support a wide range of multi-vendor hardware platforms and operating systems in a mixed environment. This allows users to tailor their SANs for the specific platforms and operating systems they require. With Version 8.
What’s New Switch Configurations There is a restriction in DRM design options when building Fibre Channel fabrics using Compaq Fibre Channel switches by Brocade and running the currently supported Brocade switch firmware and ACS Version 8.6-4P.
What’s New • Fibre Channel SAN Switch V2.6 firmware supports DRM using Fiber Channel (FC) optical links, and links through wavelength division multiplexing (WDM) boxes that do not alter the FC protocol. It does not currently support some DRM configurations using FC-IP or FC-ATM links, and will require the use of earlier firmware versions. For the latest update on supported DRM configurations please refer to the DRM Application Notes for intersite links, which can be found at: http://www.compaq.
Common Platform Issues Rolling Upgrade The rolling upgrade procedure is documented in the SANworks by Compaq Data Replication Manager HSG80 ACS Version 8.6-4P Configuration Guide. The procedure is designed to allow an array controller software upgrade without the need for a server reboot. However, you must ensure that all the latest drivers, and if applicable, the latest release of Secure Path are installed prior to this upgrade. Installing the latest drivers may require the server to be rebooted.
Common Platform Issues Performance Considerations—Full Copy Operation During full copy operations, host I/O performance will be moderately reduced, and the length of time required for the copy operation will be longer than that for a merge operation. Performance Considerations—Write History Log Merge During Write History Log merge, host I/O performance will be drastically reduced due to the high priority given to the merge operation.
Common Platform Issues Resetting FcAL fanFrameDisable Value to Zero If you perform a CONFIGURE command and change the setting of any of the Fabric Parameters, the value of the FcAL fanFrameDisable parameter also becomes changed from 0 to 1. You must go into the Arbitrated Loop Parameters and change the setting of Send FANframes to 1. This will reset the FcAL fanFrameDisable parameter back to 0.
Common Platform Issues Controller Saturation High usage of many remote copy set and non-remote copy set LUNs will have a serious impact on the performance of the remote copy set LUNs, causing controller saturation and possibly starving a full copy operation. A saturated controller condition begins approximately when idle time falls to 25% or less. When this occurs, you may see Aborted Command errors through the Command Line Interface (CLI).
Common Platform Issues Required Delay Time Before Failback Be careful that you don’t start a site failover or site failback process too soon. You must wait a minimum of 15 minutes from the completion of a site failover process to begin a site failback procedure. You must also wait a minimum of 15 minutes from the completion of a site failback process to begin a site failover procedure.
Common Platform Issues Intermittent Double Normalization After a Full Failback or Failback To New Hardware Procedure After you have performed a full failback or failback to new hardware, a second normalization (from the initiator to target) can occur. This double normalization happens after the point in the failback procedure where you add the target and normalize your storage sets (from the target to initiator).
Platform-Specific Issues Association Sets Association sets can contain up to 12 remote copy sets. However, because all copy sets within an association set are moved between controllers as a group, all remote copy sets within an association set must be accessed by the same server. For instance, 6 remote copy sets (one association set) could be accessed by one server and 6 remote copy sets (another association set) by the other.
Platform-Specific Issues Compaq TRU64 UNIX Additional Software Requirements A list of the most current software for Compaq Tru64 UNIX can be found at the following website: http://www.compaq.com/products/sanworks/drm/index.html Follow the Software Support Matrices link, then choose Tru64 UNIX. Prevent Possible Data Corruption If during the failover procedure you are unable to stop all applications and dismount all units that are part of a remote copy set, you must reboot hosts prior to failback.
Platform-Specific Issues Configuring Host Server Remote Copy Sets Remote copy sets (RCS) at the target site will acquire the world wide name of their RCS at the initiator site when a failover occurs. Compaq recommends that you not configure the RCS on the HP-UX host servers at the target site until after a failover. IBM AIX Additional Software Requirements A list of the most current software for IBM AIX can be found at the following website: http://www.compaq.com/products/sanworks/drm/index.
Platform-Specific Issues • If the boot LUN is online to a controller that the server cannot access, the server will be unable to boot. This condition could occur if the link between the server and the fabric is broken. At this stage of booting, the server cannot move the LUN between controllers. The LUN must be manually moved to the other controller by issuing a RESTART THIS_CONTROLLER CLI command.
Platform-Specific Issues If the verify fails, the path is not available. The path becomes available again after the controller is booted. Component failures and other real failure scenarios cause paths in Secure Path to be correctly marked as failed. LUNs Numbered Incorrectly When LUNs are moved between hosts (such as during a site failover or a site failback), it is possible that the LUNs may become “out of letter order.
Platform-Specific Issues Windows Using Large LUNs While in SCSI-2 Mode DRM supports Windows 2000 hosts accessing LUNs above D7 without offsets via large LUNs. However, all hosts using large LUNs to access LUNs on a controller in SCSI-2 mode must be able to access LUN D0. Refer to the Compaq SANworks Secure Path Version 3.1 for Windows Installation and Reference Guide for additional information.
Platform-Specific Issues 3. Once Windows NT sees the disks ordered properly, use Secure Path Manager to move the units to the correct path. Windows Using Large LUNs While in SCSI-2 Mode DRM supports Windows NT hosts accessing LUNs above D7 without offsets via large LUNs. However, all hosts using large LUNs to access LUNs on a controller in SCSI-2 mode must be able to access LUN D0. Refer to the Compaq SANworks Secure Path Version 3.1 for Windows Installation and Reference Guide for additional information.
Platform-Specific Issues NetWare 6 Storage Planning Considerations If you plan on using Novell Storage Services (NSS) logical volumes in a DRM configuration, you should be aware that the nature of Novell's Distributed File Services (DFS) allows you to span an NSS volume across multiple hard disk partitions. This is not desirable in a DRM configuration. Instead, you should maintain a one-to-one relationship among LUNs, remote copy sets, NSS partitions, NSS pools, and NSS logical volumes.
Platform-Specific Issues 4. Ensure the Media tab is highlighted and NSS Pools is displayed. Click the correct NSS Pool from the list on the left to highlight the pool, and then click the Update NDS button. 5. Click the Media tab and then NSS Logical Volumes. 6. Click the correct NSS Logical Volume from the list on the left to highlight the volume, and then click the Update NDS button. NOTE: You must perform steps 4-6 above for each NSS Pool/Volume pair you failover from the initiator site.
Compaq Website Partitioned LUNs Novell servers cannot handle accessing partitions if another partition on the same physical disk (LUN) is accessed by another operating system. When this happens, the Novell server may lockup. To prevent this from occurring, remove access by the other operating system to the partitions. Maximum Number of Host Bus Adapters The maximum number of host bus adapters supported by a Novell host is 4. This is a limitation of Secure Path.
