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Persistent DSF and Legacy DSF(s)

Sreer
Valued Contributor

Persistent DSF and Legacy DSF(s)

Hi Gurus,

Iam new to 11.v3 Can any one pls help me to understand the difference btw Persistent DSF and Legacy DSF(s).


rgds Sreekumar
4 REPLIES
Michal Kapalka (mikap)
Honored Contributor

Re: Persistent DSF and Legacy DSF(s)

Michal Kapalka (mikap)
Honored Contributor

Re: Persistent DSF and Legacy DSF(s)

sujit kumar singh
Honored Contributor

Re: Persistent DSF and Legacy DSF(s)

hi


ioscan -fnCdisk -- shows legacy paths that is bound to teh Controller instance number and can change as the controller instance number changes.

ioscan -fnNCdisk --- shows the Persistent DSF files for the device file, this is bound to the WWWN ID of the LUN and this does niot change if there is a change in the COntroller instance or HBA or the change in SAN Switch port etc etc

ioscan -m hwpath -- shows the HW path in Legacy as well as LUN path as well as the LUN HW path

ioscan -m dsf --- shows mapping between the legacy and persistent DSF

vgexport -N option helps you migrate VGs using the new PDSFs

etc etc


can have a look at the Next Generation Mass storage Stack:

http://docs.hp.com/en/MassStorageStack/The_Next_Generation_Mass_Storage_Sta
ck.pdf




regards
sujit
SoorajCleris
Honored Contributor

Re: Persistent DSF and Legacy DSF(s)

Hi Sreekumar,

There are so many advantages if you are using Persistent DSF.

1. There is only one device for a LUN/disk even if there are morethan one physical link to the disk. So that it is very easy to manage the device.

2. You have native multipathing

3. easy to remember as the device will be disk1, disk2 kind of numbers..

Regards,
Sooraj
"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity" - Dennis Ritchie