IBM DS4700 MPIO DRIVER
They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Check configuration When you configure active and passive paths you assume that first path listed is to controller A and second path is to controller B. I have to refresh to get rid of the dead path and then restart the IO. But what i did not get is how to manage the paths? That affirms just what you said.
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Initiators from other host systems are required to register before they can access the device. I didn’t try such configuration. Leave a Reply Cancel reply Enter your comment here We have a similar multipath environment, and we see 4 paths as well. Sorry, your blog cannot share posts by email.
IBM Subsystem Device Driver Device Specific Module (SDDDSM) – United States
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. And in the case you’ll have a zone s that allows both Vs4700 ports to see both storage processors.
This simplifies zoning and improves performance. If all else fails, try deleting hdisk5 and 6 rmdev -dl hdisk5; rmdev -dl hdisk6 and rerunning cfgmgr.
Personally i don’t like configuration with more that two paths from server to storage one per controllermoreover it isn’t supported in for mpi OS and all multipath software. I was wondering why this is not possible with IBM storage manager installed.
Underneath the “multipath disk device” in the Disk dives tab of the control panel you probably have several SCSI disk devices, one for each path of each LUN. Looking for Multipathing software to be installed on my windows Host to manage vs4700 balance multipath. Finally, this book highlights several scenarios that demonstrate the preferred practices and performance guidelines.
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Fibre Channel (SAN)
Specifically, it displays information about the frame subsystemincluding the frame’s assigned name and worldwide name, and a list of hdisks only those currently in the Available state associated with that subsystem, including the hdisk name, Mpik number, current ownership, preferred path, and ibj user-assigned label for that volume. The other two paths are used if the preferred controller is not accessible by the host.
Find More Posts by dafydd So there was one route to the FC switch.
DS logical drive representation in Windows Server The mpiio zone contains a different HBA port and controller port from controller B.
Read the information from readme file for firmware When you configure active and passive paths you assume that first path listed is to controller A and second path is to controller De4700. By continuing to use this website, you agree to their use.
First of all thanks for the good info. Ours is running in production with VMs, so when the disk came mppio a crawl during the aforementioned operations we really suffered. But it seems you should enable AVT in this case.
Switching From RDAC To MPIO For DSXX00 SAN Array – blog’o thnet
Each time a different path is selected, thrashing occurs and performance degrades because of the overhead of sending a BDR ds47000 issuing a reserve to the target device. For example selecting a preferred path, load balancing IO across different paths etc.
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