Asset ID:	1-71-1011665.1
Update Date:	2010-08-10
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1011665.1 :   Compatibility Between Sun StorEdge[TM] Fast Write Cache (FWCache) and Veritas Volume Manager Dynamic MultiPathing (DMP)  


PreviouslyPublishedAs
215991

Steps to Follow

The documentation for the "SUN StorEdge Fast Write Cache" (FWCache)
product states that one should "avoid multiple paths to the data".
This wording has been the cause of concern among Veritas Volume Manager
users who use Volume Manager's DMP capability.
However, there is no need for concern.  Using DMP and FWCache together
is fine.
What is meant by "multiple paths" is one path THROUGH the cache and
another path AROUND the cache.
For example, if you have a disk referred to as c1t0d0 and a second path
as c2t0d0, and you cache all reads and writes to c1t0d0 but do not
cache reads/writes from/to c2t0d0, data corruption could occur.
Everything is fine as long as it is the Volume Manager volumes that are
being cached.  Since VxVM and DMP are all below (logically speaking)
the FWCache, everything is fine.

Product
VERITAS Volume Manager 3.0.2 Software
Sun StorageTek Volume Manager 2.6
Sun StorageTek Fast Write Cache 2.0 (Localized)
Sun StorageTek A5200 Array
Sun StorageTek A5100 Array
Sun StorageTek A5000 Array

VxVM, Volume Manager, DMP
Previously Published As
20594

Change History
Date: 2006-01-18
User Name: 95826
Action: Update Canceled
Comment: *** Restored Published Content *** SSH AUDIT
Version: 0
Date: 2006-01-18
User Name: 95826
Action: Update Started
Comment: SSH AUDIT
Version: 0
Date: 2003-05-20
User Name: Administrator
Action: Migration from KMSCreator
Comment: updated by : Neil Hickey
comment : tm, title, properties
date : Mar 22, 2002



updated by : Robert Belloni
comment : changed properties

date : Mar 7, 2002



updated by : Robert Belloni
comment : changed Subject line
date : Feb 13, 2002



updated by : Robert Belloni
comment : removed internal comment
date : Feb 12, 2002



updated by : Robert Belloni
comment : checked spelling and added xml tags
date : Feb 11, 2002



updated by : Karen Edwards
comment : Not entered
date : Sep 24, 1999
Version: 0
Product_uuid
a99f8f3a-2bd5-11d6-87a3-e467d9c55f5e|VERITAS Volume Manager 3.0.2 Software
a97aa3e6-2bd5-11d6-9f5c-a4660ab64573|Sun StorageTek Volume Manager 2.6
4518bfa5-e1bc-4a50-9ded-5611e82d1179|Sun StorageTek Fast Write Cache 2.0 (Localized)
2a8acc34-0a18-11d6-87ef-bd9528a0b933|Sun StorageTek A5200 Array
2a875298-0a18-11d6-8960-b3c71159a860|Sun StorageTek A5100 Array
2a83ce34-0a18-11d6-8498-8ec5d44f476b|Sun StorageTek A5000 Array

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