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тАО11-09-2009 05:23 PM
тАО11-09-2009 05:23 PM
On one of our EVA 8000s here the RSS Disk State for more than 1 of the disk groups says 'None'. I know this isn't good.
I've had a look through ITRC and found a couple of excellent discussions - http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1257804744109+28353475&threadId=1003376 and http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1002866.
These give me some info about what the various RSS Disk State levels mean but what I don't understand is how this can happen at all.
It was my understanding that the RSS sets are managed by VCS and not user-controllable without what basically amounts to a 'hack' e.g. ungrouping, moving, regrouping.
How can this happen, i.e. how the RSS Disk State be 'None'? How can I fix it? The groups aren't disk-type specific and contain both FC and SATA disks (in different groups of course).
Thanks! :)
Chris
Solved! Go to Solution.
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тАО11-09-2009 09:48 PM
тАО11-09-2009 09:48 PM
SolutionCorrect (on the EVA 4/6/8xxx it is called XCS), but unfortunately the controller software is far, far from perfect. I had seen one case (not the most recent firmware, but I don't believe XCS has made any progress in that area...) where I've added disk drives to an existing disk group without any virtual disks. The parity state went from parity to mirror on an 2C12D while there were enough disk drives left (and distributed across the enclosures) to keep the parity state.
Some years back there was some rumor that engineering was thinking about adding code to actively optimize RSS states, but it seems that this area has never been touched. Worse: XCS/CV-EVA have been degraded to hide this type of information.
Hm, that rings a bell: I don't know where you looked, but there are certain software combinations where CV-EVA claims the RSS state is none, but the real state is already masked by the controller firmware.
Can you create a report using SSSU and saving the output of "ls disk full xml" and "ls disk_group full xml", put it in a .TXT file, compress it to a .ZIP file and attach it to a response? Then I could take a look at it and tell you if/which disk combinations are less than optimal.
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тАО11-10-2009 02:02 AM
тАО11-10-2009 02:02 AM
Re: RSS Disk State
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01062600
To know the RSS distribution you must extract the information with SSSU and see in what RSS is each disk.
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тАО11-10-2009 12:04 PM
тАО11-10-2009 12:04 PM
Re: RSS Disk State
I'm new to this particular role so I'm only going from screenshots right now and don't have access to run SSSU on the SAN in question just yet. My access should be granted today I hope!
Why would HP stop users from quickly viewing the RSS state information? Isn't this a vital way of telling if your redundancy is ok for a disk group? I'm a bit confused by that decision.
If I run SSSU and find that the DG does in fact have an RSS Disk State of 'None', what can I do about it? Do I have to physically ungroup, move and regroup the disks so the RSS sets are split across shelves?
Another question - can an RSS Disk State of 'None' be caused by DG physical disk placement unknowingly?
Sorry if I'm not providing very good info - it's hard to do that without access to CV-EVA. :)
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тАО11-10-2009 01:53 PM
тАО11-10-2009 01:53 PM
Re: RSS Disk State
Yes, you can manually move disks around, the EVA does not care about the physical position of the disks, it uses their WWID. But RSS distribution can change after a disk failure or adding disks, a RSS can merge with another or split in two.
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тАО11-10-2009 02:02 PM
тАО11-10-2009 02:02 PM
Re: RSS Disk State
> after 2500 EVA cases, I can confirm this is NOT something you should worry about
Ok, that's good to know!
> Yes, you can manually move disks around, the EVA does not care about the physical position of the disks, it uses their WWID. But RSS distribution can change after a disk failure or adding disks, a RSS can merge with another or split in two.
Does the RSS set *only* relate to redundancy of disk *shelves*? Do they relate to disk groups at all?
As a very high-level question is there anything that really needs to be done re RSS sets or will XCS always configure them in the best way? I'm trying to work out if there's anything I need to do once I have the full picture of how the RSS sets are configured currently (again, once I have my login to the 8000 here).
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тАО11-10-2009 02:09 PM
тАО11-10-2009 02:09 PM
Re: RSS Disk State
Yep I'll do that once my access is sorted. The scripting guide for SSSU documents "ls disk
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тАО11-10-2009 02:30 PM
тАО11-10-2009 02:30 PM
Re: RSS Disk State
Run with SSSU.EXE "file SSSUscan.txt" > config.txt
Attach result here.
--------------------
RSS state = Parity means no two disks of a RSS are in the same disk shelf
RSS state = Miror means no two disks that are a mirror pair are in the same disk shelf
RDD state = None means two disks from the same RSS and that are a mirror pair are on the same disk shelf.
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тАО11-10-2009 03:23 PM
тАО11-10-2009 03:23 PM
Re: RSS Disk State
Oh and my mistake for saying the documentation for "ls disk" doesn't include info about "full" or "xml" ... it's in the command reference near the end of the document. Oops. :)
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тАО11-11-2009 04:52 PM
тАО11-11-2009 04:52 PM