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02-28-2012 01:15 PM
02-28-2012 01:15 PM
any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random access.
I ran scsimgr_esdisk and found a lot of parameters.
I know I need ALUA on.
I expected some document from EMC or HP that would tell me what to set these to or risk crashes.
So I'll ask you guys.
People use computers? HP computers?
People sometimes hook up disk arrays from EMC to them? With a fibre connection?
People seem to be using hpux 11.3.
Maybe people use itanium.
So there has to be like maybe 5 people out there?
When you 5 people of Earth set up your EMC array, did you set scsimgr parameters?
Did you live with the defaults?
scsimgr get_attr -D /dev/rdisk/disk5 -a congest_max_retries 90
scsimgr get_attr -D /dev/rdisk/disk5 -a max_retries 45
scsimgr get_attr -D /dev/rdisk/disk5 -a path_fail_secs 120
scsimgr get_attr -D /dev/rdisk/disk5 -a esd_secs 30
scsimgr get_attr -D /dev/rdisk/disk5 -a load_bal_policy round_robin
scsimgr get_attr -D /dev/rdisk/disk5 -a preferred_path nothing here.
scsimgr get_attr -D /dev/rdisk/disk5 -a alua_enabled true
scsimgr get_attr -D /dev/rdisk/disk5 -a max_retries 45
scsimgr get_attr -D /dev/rdisk/disk5 -a max_q_depth 128 (It was 8).
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02-28-2012 09:49 PM
02-28-2012 09:49 PM
Re: any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random acc
I have no idea if this array is ALUA (like HP P6000) or not (like HP P9500), butgoogle findings point to ALUA.
Usually the server is aware of this behaviour, you can check like this:
# scsimgr get_info -D /dev/rdisk/disk54
...
LUN access type = T10 Asymmetric Active-Active
Asymmetric logical unit access supported = Both implicit and explicit
...
Hope this helps!
Regards
Torsten.
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02-29-2012 12:01 AM - last edited on 06-18-2021 03:41 AM by Ramya_Heera
02-29-2012 12:01 AM - last edited on 06-18-2021 03:41 AM by Ramya_Heera
Re: any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random acc
The VNX is the replacement for the EMC Clariion right?
So on the Clariion, as long as you had the failover modes set correctly for HP-UX11iv3 (11.31), then the HP-UX IO stack would auto-sense the ALUA settings and set all parameters appropriately. I know when it was Clariion, you needed to be on failover mode 4. For the VNX I would assume it is similar or the same. This manula here ceratinly gives that impression:
https://elabnavigator.emc.com/emcpubs/elab/config_guide/HP-UX.pdf
See p186
For all the rest of those options, typically I see them left at their defaults except occasionally people change the max_q_depth, but as to how you go about setting that, well there's a whole technical paper on the best way to manage that:
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02054623/c02054623.pdf
I am an HPE Employee
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02-29-2012 12:58 AM
02-29-2012 12:58 AM
Re: any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random acc
We have EMC Symmetrix arrays, and lived happily with the defaults.
In general, unless the EMC Connectivity Guide for HP-UX and/or the EMC support matrix specifically says you need to change some value, the defaults should be safe.
Having said that, the Appendix D in the latest version of the HP-UX Connectivity Guide is titled "Excessive Path Failovers in LVM PVLink VNX Series and CLARiiON Configurations". It says nothing about the outcome, but I guess excessive path failovers would not cause crashes, but rather would murder your I/O performance. The instructions are rather specific and too long to copy here: you should get the Connectivity Guide from powerlink.emc.com and read it.
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02-29-2012 02:08 AM
02-29-2012 02:08 AM
Re: any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random acc
MK,
On 11.31, I think its unlikely that Steve will be using PVLinks - of course the manual isn't clear about whether the same issue can be seen with the 11.31 native MPIO stack. I'd suggest Steve ask EMC for clarification on that, although I suspect their response will be "Use PowerPath"!
I am an HPE Employee
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02-29-2012 05:53 AM
02-29-2012 05:53 AM
Re: any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random acc
Thank you all. I didn't expect an answer. I merely hoped for one.
Most of your suggestions I already did. But I am VERY glad to hear suggestions. It means I'm not the only person on Earth using this. And the suggestions were all good. I do not want to put a solved tag on any of them because the responses are all good.
I have been in contact with EMC support. This morning he confirmed I should not change the defaults. I need the failover set to 4 for ALUA (which I already did). And the max_q_depth should not be greater than 16.
After things simmer down a bit, I will probably update this thread. If I find my critical key that fixes my performance problem I will definitely update the thread.
steve
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04-08-2013 12:26 AM
04-08-2013 12:26 AM
Re: any proper settings for scsimgr lun_paths ALUA hpux11.31 EMC Vnx5100 array, database-random acc
Hi Steve!
Did you get a fix for your performance issue. It'll be helpfu if you can share!