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08-17-2006 03:12 AM
08-17-2006 03:12 AM
Solved! Go to Solution.
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08-17-2006 03:56 AM
08-17-2006 03:56 AM
Re: Storage works merging for 24 hours after node crash
What version of VMS? If it's V7.3-2 (with recent patch kits) or later, you should strongly consider using Host-Based Minimerge (HBMM).
If HBMM is not an option, please see the documentation regarding the logical name SHAD$MERGE_DELAY_FACTOR
-- Rob (one of the HBMM engineers)
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08-17-2006 04:00 AM
08-17-2006 04:00 AM
Re: Storage works merging for 24 hours after node crash
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08-17-2006 04:21 AM
08-17-2006 04:21 AM
Solutionto start with:
WELCOME to the VMS Forum.
The time you observe for Shadow Merges has for a LONG time been an issue.
That is, it BECAME an issue when non-DSA-compliant disks came into wide use.
If you were shadowing devices on HSC, (and I beleive both of HSJ and HSD, no experience there, so not sure) you were used to shadow merge times of several SECONDS.
HBVS shadowing of SCSI devices however took MANY hours. Your 24 hour is no record, by far.
But, Engeneering FINALLY managed to get HBMM (HostBasedMiniMerge) to work. It certainly earned them a BIG applause from me (on behalve of our users)!
Obviously you do not have HBMM activited.
If ever there was an incentive to do just that, _YOU_ have found out the hard way!
Just instal HBMM_002 (I have not got the exact name, but you need V2).
The hardest part is finding the command in the realease notes, and you are all set.
Success!
Proost.
Have one on me.
jpe
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08-17-2006 04:53 AM
08-17-2006 04:53 AM
Re: Storage works merging for 24 hours after node crash
(esp shadowing, fibre_scsi)
Purely Personal Opinion
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08-17-2006 05:12 AM
08-17-2006 05:12 AM
Re: Storage works merging for 24 hours after node crash
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08-17-2006 05:26 AM
08-17-2006 05:26 AM
Re: Storage works merging for 24 hours after node crash
-- Rob
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08-17-2006 11:25 AM
08-17-2006 11:25 AM
Re: Storage works merging for 24 hours after node crash
On the Test Cluster,after a crash, disk merges would take about 3 days to completed. After HBMM was introduced the merges were completed in about 15 minutes. Repeat 15 minutes....
Treat HBMM deployment as a project. You will need to know your disk usage patterns and configure accordingly.
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08-18-2006 02:23 AM
08-18-2006 02:23 AM
Re: Storage works merging for 24 hours after node crash
-- Rob
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08-18-2006 03:24 AM
08-18-2006 03:24 AM
Re: Storage works merging for 24 hours after node crash
We went down from 18 hours to well under 1 minute.
fwiw.
Proost.
Have one on me.
jpe
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08-18-2006 07:03 PM
08-18-2006 07:03 PM
Re: Storage works merging for 24 hours after node crash
Jirza
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08-31-2006 03:45 AM
08-31-2006 03:45 AM
Re: Storage works merging for 24 hours after node crash
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08-31-2006 04:38 AM
08-31-2006 04:38 AM
Re: Storage works merging for 24 hours after node crash
any VMS732_UPDATE_Vnn00 kit (starting with VMS732_UPDATE-V0300) has the fixes from VMS732_HBMM-V0200 included.
If you have not installed that update kit (or any newer ones: check with PROD SHOW HIST *UPDATE*), you would want to download and install the most recent update kit (VMS732_UPDATE-V0700) and the other patches, which are not included in the UPDATE kits (see ftp://ftp.itrc.hp.com/openvms_patches/alpha/V7.3-2/ALPHA_V732_MASTER_ECO_LIST.txt).
Volker.
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08-31-2006 04:42 AM
08-31-2006 04:42 AM
Re: Storage works merging for 24 hours after node crash
----
What kits do you have installed now? It's quite possible that you already have the needed bits on your system.
PROD SHOW HIST VMS732_UPDATE
will show the relevant kits installed
-- Rob
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08-31-2006 04:45 AM
08-31-2006 04:45 AM
Re: Storage works merging for 24 hours after node crash
$ PROD SHOW HIST VMS732_UPDATE
----------------------------------- ----------- ----------- --------------------
PRODUCT KIT TYPE OPERATION DATE AND TIME
----------------------------------- ----------- ----------- --------------------
DEC AXPVMS VMS732_UPDATE V4.0 Patch Install 08-JUL-2005 11:56:23
DEC AXPVMS VMS732_UPDATE V3.0 Patch Install 11-MAR-2005 09:01:18
----------------------------------- ----------- ----------- --------------------
2 items found
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08-31-2006 04:50 AM
08-31-2006 04:50 AM
Re: Storage works merging for 24 hours after node crash
you are all set regarding the HBMM patch. You have not installed the most recent update kit, but you should be fine regarding HBMM.
Volker.
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08-31-2006 04:56 AM
08-31-2006 04:56 AM
Re: Storage works merging for 24 hours after node crash
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08-31-2006 05:13 AM
08-31-2006 05:13 AM
Re: Storage works merging for 24 hours after node crash
in one word: YES.
But it is a little bit hidden in there,
I have not got them at hand, but something like SET VOLUME Dxxx /HBMM. It can be issued while the shadow set is in use.
For now, do not worry about the various policies: the default will do almost always.
Proost.
Have one on me.
jpe
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08-31-2006 05:30 AM
08-31-2006 05:30 AM
Re: Storage works merging for 24 hours after node crash
the OpenVMS V8.2 New Features and Documentation Overview manual contains HBMM related information in Chapter 6:
http://h71000.www7.hp.com/doc/82FINAL/6675/6675pro_007.html#minimerge_fc_h
You can also refer to the OpenVMS Volume Shadowing manual.
Volker.
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08-31-2006 05:36 AM
08-31-2006 05:36 AM
Re: Storage works merging for 24 hours after node crash
Thank you all for all your help. I have assigned as many points as possible so y'all
get the correct head gear!
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08-31-2006 07:52 AM
08-31-2006 07:52 AM
Re: Storage works merging for 24 hours after node crash
The HBMM policy syntax can look a bit intimidating at first, but most sites won't need things like multi-masterlist policies.
Good luck!
-- Rob (part of the HBMM engineering team)
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09-01-2006 03:48 AM
09-01-2006 03:48 AM
Re: Storage works merging for 24 hours after node crash
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09-01-2006 04:05 AM
09-01-2006 04:05 AM
Re: Storage works merging for 24 hours after node crash
"Turning on" HBMM isn't as simple as using a single DCL command. You really should read the entire HBMM documentation, to have a complete understanding of how it works, what resources are consumed, considerations to be taken when planning what nodes will have bitmaps, etc...
-- Rob
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09-01-2006 05:04 AM
09-01-2006 05:04 AM