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тАО05-22-2003 04:11 AM
тАО05-22-2003 04:11 AM
EMC queue depth
We have a mixture of meta-volumes (striped disks) and regular devices which by default all are getting a queue_depth of 8.
My hunch is the metas (4 regular devices) should probably be at least 16 but possibly as high as 32.
We are going to experiment on this, but was curious to see what others have done. A search of the forums and EMC support site shows generic references to queue_depth but nothing concrete.
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тАО05-22-2003 04:23 AM
тАО05-22-2003 04:23 AM
Re: EMC queue depth
http://powerlink.emc.com ?
If not, register and get a login, btw your emc rep can help you.
live free or die
harry
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тАО05-22-2003 04:51 AM
тАО05-22-2003 04:51 AM
Re: EMC queue depth
Regards,
RZ
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тАО05-22-2003 04:57 AM
тАО05-22-2003 04:57 AM
Re: EMC queue depth
Yes have access to Powerlink - didn't find any interesting documents. We actually are working with our EMC rep on this and they gave us some documents - but once again nothing specific.
Just looking for some other opinions to see what other people are doing.
We are probably going to bump some of our meta devices to 16 and see if there is any change - good or bad.
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тАО05-22-2003 11:28 AM
тАО05-22-2003 11:28 AM
Re: EMC queue depth
What is it a parameter of? Not HP-UX?
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тАО05-22-2003 11:51 AM
тАО05-22-2003 11:51 AM
Re: EMC queue depth
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тАО05-23-2003 07:08 AM
тАО05-23-2003 07:08 AM
Re: EMC queue depth
Our queue depth is set to 16, according to our documentation on our setup documents.
We use 64GB Metas as well as 8.43 gb hypers for our HFS Filesystems. We trust the SYMM to protect our data.
Tim
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тАО10-28-2004 07:38 AM
тАО10-28-2004 07:38 AM
Re: EMC queue depth
After a year has gone by did upping the queue depths ever have any good effects ?
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тАО11-03-2004 03:02 AM
тАО11-03-2004 03:02 AM
Re: EMC queue depth
I never found anybody (EMC/HP/other) that could state if/how this would help. In fact found a few sources that said they didn't believe it would make a difference.
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тАО11-03-2004 03:19 AM
тАО11-03-2004 03:19 AM
Re: EMC queue depth
Someone posted this whitepaper on Q depth a few days ago. It might help.
As a general rule, Array Controller Port Qdepth => no.of LUNs x Q depth.