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April 28th, 2015 07:00
SRDF/A split consistency
I am a bit confused about the SRDF/A enable consistency. With the consistency enable, I cannot perform a split without using force option. Is this suppose to be a normal behavior?
What is the right way? Should I disable the consistency first before perform a split? What is the impact of disabling the consistency?
symrdf -g mydg disable
symrdf -g mydg split
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Neel_c
32 Posts
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May 7th, 2015 00:00
There are 2 levels of consistency. 1 for devices and the other for DGs.
lets say you query a DG example01 . #symrdf -g example_dg query
you will get output say..
DEV002 186E RW 0 0 RW 2075 WD 0 0 A... Consistent
DEV003 0B5D RW 0 0 RW 0DE6 WD 0 0 A... Consistent
This Consistent here means that data is same in the R1 and R2 device. Whichever data exists in R1 the same data is available in R2 as well.
Now try the command # symrdf -g example_dg query -rdfa
The output will show you if DG level consistency is enabled or not.
DEV002 186E RW 0 0 RW 2075 WD 0 0 A..X. Consistent
DEV003 0B5D RW 0 0 RW 0DE6 WD 0 0 A..X. Consistent
The X denotes consistency is enabled.
Now this consistency denotes that in the DG all the dev using the same RA group are in a similar state.
When consistency is enabled you cannot have some devices in Split,some as consistent or some in Syncronized/sync in progress.
All will be in same state i.e either consistent/split/syncronized/sync in progress.
The reason we enable consistency is that no other person can stop/drop SRDF using SRM.
Hope this helps.