IBM(R) Multipath Subsystem Device Driver Path Control Module (PCM) Version 3.0.0.0 README FOR AIX™ Jan 17, 2011 --------------------------------------------------------------------------- CONTENTS 1.0 About this README file 1.1 Who should read this README file 1.2 How to get help 2.0 Prerequisites for SDDPCM 3.0 SDDPCM change history 3.1 Defects Fixed 3.2 New Features 3.3 Feature Details 4.0 User license agreement for IBM device drivers 4.1 Background / Purpose 4.2 Definitions 4.3 License grant 4.4 Responsibilities 4.5 Confidential information 4.6 Limitation of liability 4.7 Termination 4.8 Representations and warranties 4.9 General provisions 4.10 Appendix A 5.0 Notices 6.0 Trademarks and service marks --------------------------------------------------------------------------- 1.0 About this README file Welcome to IBM Multipath Subsystem Device Driver Path Control Module(SDDPCM). This README file contains the most recent information about the IBM Multipath Subsystem Device Driver PCM, supporting DS8000 Open System HyperSwap Version 3 Release 0 Modification 0 Level 0 (SDDPCM 3.0.0.0) for AIX. IBM recommends that you print and review the contents of this README file before installing and using SDDPCM on AIX with MPIO-capable disk driver. 1.1 Who should read this README file This README file is intended for storage administrators, system programmers, and performance and capacity analysts. The information in this file only applies to customers who run: 1. DS8000 with SDDPCM supporting Open HyperSwap 2. Tivoli Productivity Center for Replication 1.2 How to get help Go to the following Web site for SDD/SDDPCM technical support and for the most current SDD documentation and support information: http://www.ibm.com/servers/storage/support/software/sdd/ --------------------------------------------------------------------------- 2.0 Prerequisites for SDDPCM supporting DS8000 Open HyperSwap feature The Open HyperSwap functionality for Tivoli Storage Productivity Center for Replication requires a minimum version of R5.1 with DS8700. Prior to install SDDPCM,you must deinstall fileset "ibm2105.rte"(version of 32.6.100.XX) and "devices.fcp.disk.ibm.rte"(version of 1.0.0.XX) host attachment for SDD driver, along with the SDD package. The SDD driver and SDDPCM supporting DS8000 Open HyperSwap module can not coexist on one server. You must install the following host attachment for SDDPCM v3.0.0.0, which only configures DS8000 storage devices, and a new DS8K storage device attribute - 'retry_timeout': devices.fcp.disk.ibm.mpio.rte (version 2.0.0.1) Please check the AIX fix central website for fix availability: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix If not available for download, contact AIX software support to determine eligibility for a temporary fix. sddpcm 3.0.0.0 only supports DS8000 storage devices with Open HyperSwap feature. It requires the following AIX releases and APARs: AIX Level APAR AIX53V TL11 IZ33540 IZ68202 IZ82078 AIX61H TL04 IZ33541 IZ68187 IZ78841 AIX53X TL12 IZ51404 IZ68197 IZ81632 AIX61J TL05 IZ51405 IZ69033 IZ78807 NOTE: Currently APAR IZ82078, IZ78841, IZ81632 and IZ78807 are not available for download, please contact IBM software support for a temporary fix. The AIX APARs are available from AIX fix central website: http://www-912.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix --------------------------------------------------------------------------- 3.0 SDDPCM change history =============================================================================== 3.1 Defects Fixed =============================================================================== 3.2 New Features 2.4.0.5 --------- 4585: Add a new device attribute - 'retry_timeout', which sets the timeout value for I/O retry on last path. 3.0.0.0 --------- OAR 1396: Support DS8000 storage Open HyperSwap on AIX open system by SDDPCM and TPC-R. 4751: Add 'pcmpath query session' and 'pcmpath query device -S ' 4810: New commands provided to stop and restart AE daemon and pcmsrv daemon 4827: Add Open HyperSwap related events in AIX host errlog =============================================================================== 3.3 Feature/defect Details 4585: Starting from v2.4.0.3, a new device attribute - 'retry_timeout' is added for ESS/DS6K/DS8K/SVC devices. This attribute allows user to set the timeout value for I/O retry on the last path. The default value of this attribute is 120 seconds and it is user-changeable with the valid range of 30 to 600 seconds. pcmpath provides a new CLI command to dynamically change this device retry_timeout attribute. The syntax of this command: pcmpath set device /( ) retry_timeout This feature enables user to adjust the timeout value to control how long SDDPCM will retry the I/O on last path before it fails to the application. In the situation where a device access is lost on all the paths permamently and command fails with TIMEOUT error, which takes rw_timeout time to fail a command. By setting retry_timeout value to default (120 seconds) or smaller value, this feature enables fast path failure and avoids I/O hanging problem under this condition. In the situation where a device loss of access is only temporary, the retry_timeout value may need to be set to a larger value. For example, during certain storage concurrent code download or storage warmstart, it is possible that all the paths to a device may lost access for a short period of time temporarily, such as from a few seconds to a few minutes. Under such situation, I/O should be retried on the last path for an extended period of time to prevent failing the I/O back to application. This will open the window for path recovery from temporary errors. OAR 1396: Support DS8000 storage Open HyperSwap on AIX open system by SDDPCM and TPC-R. Note: This version only supports DS8K devices and Open HyperSwap feature in single host environment. Clustering environment such as VIO and HACMP is not supported with current version. Configuring Open HyperSwap devices as boot or paging devices are not supported. 4751: Add 'pcmpath query session' and 'pcmpath query device -S ' to support Open HyperSwap feature. New query session option added to display session state: >pcmpath query session Total Open Hyperswap Sessions : 1 SESSION NAME: session1 SessId Host_OS_State Host_copysets Disabled Quies Resum SwRes 0 READY 20 0 0 0 0 New query device option -S added to display all Open HyperSwap devices of a session: >pcmpath query device -S session1 Total Devices in session1 Session : 4 DEV#: 2 DEVICE NAME: hdisk2 TYPE: 2107900 ALGORITHM: Load Balance SESSION NAME: session1 OS Direction: H1<-H2 ========================================================================== PRIMARY SERIAL: 25252520000 ----------------------------- Path# Adapter/Path Name State Mode Select Errors 0 fscsi0/path0 CLOSE NORMAL 6091 0 1 fscsi0/path2 CLOSE NORMAL 6300 0 2 fscsi1/path4 CLOSE NORMAL 6294 0 3 fscsi1/path5 CLOSE NORMAL 6187 0 SECONDARY SERIAL: 34343430000 * ----------------------------- Path# Adapter/Path Name State Mode Select Errors 4 fscsi0/path1 CLOSE NORMAL 59463 0 5 fscsi0/path3 CLOSE NORMAL 59250 0 6 fscsi1/path6 CLOSE NORMAL 59258 0 7 fscsi1/path7 CLOSE NORMAL 59364 0 DEV#: 3 DEVICE NAME: hdisk3 TYPE: 2107900 ALGORITHM: Load Balance SESSION NAME: session1 OS Direction: H1<-H2 ========================================================================== PRIMARY SERIAL: 25252520001 SECONDARY SERIAL: 34343430001 ----------------------------- Path# Adapter/Path Name State Mode Select Errors 0 fscsi0/path0 CLOSE NORMAL 0 0 1 fscsi0/path2 CLOSE NORMAL 0 0 2 fscsi1/path4 CLOSE NORMAL 0 0 3 fscsi1/path5 CLOSE NORMAL 0 0 4 fscsi0/path1 CLOSE NORMAL 0 0 5 fscsi0/path3 CLOSE NORMAL 0 0 6 fscsi1/path6 CLOSE NORMAL 0 0 7 fscsi1/path7 CLOSE NORMAL 0 0 Note: path needs to be opened at least once in order to show its volume asssociation, as hdisk2 in the example above. 4827: Add Open HyperSwap related events in AIX host errlog SDDPCM_CHKHSACTION SDDPCM_OSPAIRDISABLED SDDPCM_OSPAIRENABLED SDDPCM_SESSIONQUIESCE SDDPCM_SESSIONRESUME SDDPCM_SESSIONSWAPRESUME SDDPCM_SESSIONRDY SDDPCM_SWAPRESUMEDONE SDDPCM_RESUMEDONE SDDPCM_QUIESCETIMEOUT SDDPCM_OSPAIRSRFAILED SDDPCM_OSPAIRBLOCK SDDPCM_OSPAIRASSOCIATE SDDPCM_OSPAIRDISASSOCIATE For detail Open HyperSwap events associated with these errlogs, please refer to SDD User Guide, section "SDDPCM error log messages". 4810: New commands provided to stop and restart AE daemon: stopAE startAE 1. Issue "startAE" to manually start AE daemon, and "stopAE' to stop AE daemon. 2. Note: stopsrc -s AE and startsrc -s AE will still work. However, with stopsrc -s AE, AE will be respawned in 1 second. Therefore, it's not recommended for stopping AE daemon permanently. New commands provided to stop and restart pcmsrv: stoppcmsrv startpcmsrv 1. Issue "startpcmsrv" to manually start pcmsrv daemon, and "stoppcmsrv" to stop pcmsrv daemon. 2. Note: stopsrc -s pcmsrv and startsrc -s pcmsrv will still work. However, with stopsrc -s pcmsrv, pcmsrv will be respawned in 1 second. Therefore, it's not recommended for stopping pcmsrv daemon permanently. =============================================================================== 3.4 Known issues This version only supports DS8K devices and Open HyperSwap feature in single host environment. Clustering environment such as VIO and HACMP is not supported. Configuring Open HyperSwap devices as boot or paging devices is not supported. Configuring Open HyperSwap devices as dump devices is not supported. Currently DB2 with raw device access is not supported. Currently only no_reserve reserve_policy is supported. Changing path priority of Open HyperSwap enabled devices with failover_only algorithm is not supported. If user needs to change Open HyperSwap devices' configuration(rmdev, mkdev, rmpath, mkpath or cfgmgr) on the system, it is required to disable the session Open HyperSwap function from TPC_R's GUI, in order to avoid HyperSwap event happen during the middle of the devices configuration, which could cause HyperSwap failure. Therefore, for any configuration changes: 1. Disable the session Open HyperSwap function from TPC_R's GUI. 2. Make the configuration change. 3. Enable Open HyperSwap function by unchecking the session's Disable Open HyperSwap function from TPC_R's GUI. It is strongly recommended to implement 'remove copyset' from TPC-R GUI after device is closed. If AE is stopped while Open HyperSwap devices are configured, before restarting AE user needs to check if there was any unplanned Open HyperSwap request (SDDPCM_CHKHSACTION in host errlog) occurred during the time AE was stopped. If there is such an event, it is possible that AE will trigger a unplanned Open HyperSwap request when AE starts up, although the event might not exist at the time. If this is the case, user needs to remove the host connection from Tivoli Productivity Center for Replication 'Host System' page before restarting AE, in order to avoid unplanned failover. After AE is started, user needs to add back the host connection from Tivoli Productivity Center for Replication 'Host System' page. After a unplanned Open HyperSwap event, it's possible that reversed PPRC relationship is successfully established, but access to the new target storage might be still lost. If user tries to perform planned HyperSwap under this condition, HyperSwap event would cause I/O error. Therefore, user should check on each host to make sure the target storage is accessible before issuing planned Open HyperSwap to failback to the original site after the unplanned HyperSwap event. If there is a cfgmgr command being executed on the host, while user issues an Open HyperSwap Start command, host will fail the Start command and Tivoli Tivoli Productivity Center for Replication will display session state as Prepared but status as Severe. User needs to check if cfgmgr command is completed on the host and issues the Start command again. SDDPCM version 3.0.0.0 may experience a rare condition that may cause an incomplete Open HyperSwap (not all PPRC volume pairs of an Open HyperSwap session were swapped as expected). In a very rare situation, Tivoli Productivity Center for Replication GUI may display success status even though the Open HyperSwap is only partially swapped. Please confirm the status of the Open HyperSwap by checking the AIX host errlog and the output of pcmpath query device command from all hosts running I/O, to ensure that Open HyperSwap is successful with all the volume pairs in a session, after each Open HyperSwap event, especially before establishing PPRC synchronization. When this problem occurs, the AIX error logs will contain the following errors: "HYPERSWAP DEVICE QUIESCE TIMED OUT" before or after : "SWAPRESUME MESSAGE RECEIVED" Here is an example of the rare incomplete HyperSwap: 1520577F 0826204010 I O session1 QUIESCE MESSAGE RECEIVED 784E5125 0826204010 I O hdisk24 HYPERSWAP DEVICE QUIESCE TIMED OUT 784E5125 0826204010 I O hdisk21 HYPERSWAP DEVICE QUIESCE TIMED OUT 784E5125 0826204010 I O hdisk28 HYPERSWAP DEVICE QUIESCE TIMED OUT 784E5125 0826204010 I O hdisk22 HYPERSWAP DEVICE QUIESCE TIMED OUT D48C5A11 0826204010 I O session1 SWAPRESUME MESSAGE RECEIVED E46973E4 0826204010 I O session1 SESSION RESUME COMPLETED This error log pattern indicates that some devices timed out the HyperSwap attempt. Use the pcmpath query device command to check these device's "OS DIRECTION" to find out which devices failed to HyperSwap. Additionally, in an unstable San environment, there is the possibility that when some volume pairs experience the quiesce timeout condition, that IO may resume on the primary suspended volume and some of these I/Os report with good status, but are only written to the suspended primary volumes. If the host loses connection to the primary suspended volume (due to san issues), and an unplanned failover is triggered just prior to SWAPRESUME, I/O would resume to the suspended secondary volume instead. At this point both copies of the data would be corrupt. The pattern in the AIX error log that indicates this happened will be similar to this: 1520577F 0830224810 I O session1 QUIESCE MESSAGE RECEIVED 784E5125 0830225010 I O hdisk27 HYPERSWAP DEVICE QUIESCE TIMED OUT 784E5125 0830225010 I O hdisk20 HYPERSWAP DEVICE QUIESCE TIMED OUT <---- hdisk20 quiesce timed out so I/O resumed on H1 E46973E4 0830225010 I O session1 SESSION RESUME COMPLETED DE3B8540 0830225010 P H hdisk21 PATH HAS FAILED DA8A65DA 0830225010 P H hdisk21 HYPERSWAP DEVICE DISABLED EBFE3E1E 0830225110 I O hdisk21 HYPERSWAP DEVICE ENABLED 67150733 0830225110 I O hdisk21 PATH HAS RECOVERED DE3B8540 0830225610 P H hdisk20 PATH HAS FAILED DE5B2562 0830225610 P H hdisk20 HYPERSWAP EVENT TRIGGERED <--- another unplanned failover happened which moved the I/O to H2 now. D48C5A11 0830225710 I O session1 SWAPRESUME MESSAGE RECEIVED If this problem is detected, please contact IBM support team for recovery action, before you take any further actions. 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