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тАО12-18-2001 08:19 AM
тАО12-18-2001 08:19 AM
HPUX 11.x and EMC Symmetrix LUN address limitation
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тАО12-18-2001 11:33 AM
тАО12-18-2001 11:33 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
http://us-support3.external.hp.com/wpsl/bin/doc.pl/screen=wpslDisplayPatch/sid=166ec6510691702921?PATCH_PATH=/hp-ux_patches/s700_800/11.X/PHKL_24268&HW=s800&OS=11.00
live free or die
harry
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тАО12-18-2001 11:34 AM
тАО12-18-2001 11:34 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
On my system I see luns through cXtYd0 through cXtYd7.
I remember, EMC Eng. mentioning me on HP fiber adaptors the performance degrades after 128 LUNs and so we converted them to Meta-volumes.
Thanks.
Prashant.
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тАО12-18-2001 12:00 PM
тАО12-18-2001 12:00 PM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
Thanks for the info. The patch you reference was re-released to resolve issues with PHKL_25118, but does not include the LUN address fix. We are not having problems with the PHKL_25118 patch so I don't think going backwards would resolve the situation.
Prashant,
I would re-visit that issue with EMC if I were you. The number of LUNs alone should have no bearing on performance unless your data suggests that throughput would be an issue. I could have thousands of LUNs (theoretically) on an HBA and as long as only one LUN was being accessed at a time I would never run into performance problems. It all depends on your particular setup.
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тАО12-19-2001 04:06 AM
тАО12-19-2001 04:06 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
You are correct. All HP-UX hosts can only have 7 Disks (luns) per Target. That is because the Controller is an 8-bit (1 byte)field (00-FF), the Target is a one-byte field (00-FF) and the Disk is a 3-bit field (00-08). I have called HP and talked to their back line about this. The only way to get sixteen LUNS per target is to be running a superdome with HP-UX 11i and all the appropriate patches.
Hope this helps
Aaron
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тАО12-19-2001 04:10 AM
тАО12-19-2001 04:10 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
Aaron
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тАО12-19-2001 06:33 AM
тАО12-19-2001 06:33 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
What actually happens is that the actual LUNs are mapped to "ghost" targets in FC. If there are 32 LUNs, 4 ghost targets are created... You certainly can "see" all of the LUNs on the SAN.
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тАО12-19-2001 06:42 AM
тАО12-19-2001 06:42 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
i.e.
c0t0d1 - LUN 1
c0t0d2 - LUN 2
c0t0d3 - LUN 3
c0t0d3 - LUN 4
c0t0d4 - LUN 5
c0t0d5 - LUN 6
c0t0d6 - LUN 7
c0t0d7 - LUN 8
c0t1d0 - LUN 9
c0t1d1 - LUN 10
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тАО08-07-2003 09:39 AM
тАО08-07-2003 09:39 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
With hp you can only have a total of 8 luns per target. HP-UX simply does not scan the bud above those luns...
Liam
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тАО08-07-2003 09:49 AM
тАО08-07-2003 09:49 AM
Re: HPUX 11.x and EMC Symmetrix LUN address limitation
Maximum LUN configuration considerations for HP-UX.
www.docs.hp.com
2. The limits are:
cCtTdD:
cC:
tT: 0-15
dD: 0-7
15 x 7 = 105 PVs on a single "vbus"
3. But you can have multiple "vbus"-es.
vbus might be an EMC term.
When the vbus changes, the C number increments.
4. The limit is 256 PVs/HBA (I think!).
It turns out that is both an HP and an EMC limit (I think).