Single Path on Boot Up Does Not Cause Notification If a server can access only a single path to the storage when the system is loaded, there will be no notification of this problem. Install the OS of choice on each server. The term PCM is used when path control modules are being discussed generically. To avoid these situations, consider these actions: Install the HP Platform Kit. Check with your storage vendor to determine their support for Device Mapper Multipath. In addition, SDDPCM provides a health check daemon to provide an automated method of reclaiming failed paths to a closed device.
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Unless an array is specifically listed as being supported by LifeKeeper with multiple paths and with a particular multipath solution, it must be assumed that it is not.
There are many factors that will affect the frequency at which this issue may be seen. From a high level viewpoint, the SDDPCM provides many common functions and interfaces across various operating systems as an additional downloadable software entity for most IBM storage devices. To avoid these situations, consider these actions:. This can cause an application, such as a file system or database, to see IO errors.
Certified by partner testing obm a single path configuration. In some cases, multiple paths can be reported as failed leaving no paths working. The test was performed with SPS for Linux v8.
When LifeKeeper brings an SPS resource into service, it establishes a persistent reservation registered to each path that was active at that time.
dW:Eserver:IBM System Storage:dm-multipath and DS SANs – IBM System Storage Forum
Verify that Secure Path has properly configured both paths to the storage. The recommended method to clear dz4000 IOs is through a reboot but can also be done by an administrator using the dmsetup command above. There has been much improvement in Device Mapper Multipath and the vendor support to eliminate these failures.
Request a Product Feature. When LifeKeeper brings an HDLM resource into service, it establishes a persistent reservation registered to each path that was active at that time. A system with more memory may cause the failure mulltipath be seen less frequently. The feature content and the stability of this multipath product are improving at a very fast rate. This kit is expected to work equally well with other Hitachi disk arrays.
Verify that the multipath configuration is set correctly per the ds4000 of the disk array vendor.
Michael Browne Published on February 08, ss4000 Note that this does not mean that you can expect to be able to mount file systems on those other nodes for ongoing read-only access. Transient path failures While running IO tests on Device Mapper Multipath devices, it is not uncommon for actions on the SAN, for example, a server rebooting, to cause paths to temporarily be reported as failed. Secure Path Persistent Device Nodes. BR is certified by Hitachi Data Systems.
Guide to selecting a multipathing path control module for AIX or VIOS
Install the HP Secure Path software. Open topic with navigation.
If SPS allows any writes to that path prior to that point in time, reservation conflicts that occur will be logged to the system message file. Install the clustering hardware: