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Practical use of Cascaded SG
Does any body help me with the practical use of Cascaded Storage Groups in Vmax allocation.?
thanks in advacne
Raj
This post is more than 5 years old
33 Posts
0
3974
Does any body help me with the practical use of Cascaded Storage Groups in Vmax allocation.?
thanks in advacne
Raj
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dynamox
2 Intern
2 Intern
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20.4K Posts
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July 23rd, 2012 06:00
oops, i thought we were talking about initiator cascaded groups. It does not have to be cluster allocation. For example i have an Oracle system where i have data file systems and archive log file systems. I would like to use FAST for my data file systems so then can go up and down between my T1 and T2 tiers but keep my log file systems on the same teir (because of its sequential workload not very beneficial to be on EFD tier). So before code 76 i would have to create two different storage roups, two different masking views, one would be for my oracle data TDEVs and another would be for my log TDEVs. Now i can have just one masking view, one cascaded storage group.
RajeshUnni
33 Posts
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July 23rd, 2012 04:00
Thanks Saurabh , I can see your point about the usage of cascaded SGs in FAST Policy distribution.Its remarkable.. But i am still in dark about the role of same in a Cluster allocation. Could you please elaborate bit more?
thanks
Raj
RajeshUnni
33 Posts
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July 23rd, 2012 04:00
Hi Dynamox , i think you are talking about the Cascaded IG.Yes .. you are right about it.But i was just wondering about the purpose of Cascaded Storage Groups(SG) , which i saw recently in SE 7.4 guide.
dynamox
2 Intern
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20.4K Posts
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July 23rd, 2012 04:00
when you have any type of cluster where you need to share devices, yet also have the ability to present non-shared devices to cluster members. You would create cascaded initiator group that would be member of your "shared" LUNs masking view and then use individual initiator groups that will be part of your "individual LUNs masking view.
sauravrohilla
859 Posts
1
July 23rd, 2012 04:00
Rajesh, one example is what dynamox has described where you would need it for clustered host. Other significant use of Cascaded SGs will be in FAST or FAST VP. This will give you flexibility to create one child SG and associate with a fast policy and other child SG to another fast policy and parent SG will be in masking view.
regards,
Saurabh
sauravrohilla
859 Posts
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July 23rd, 2012 06:00
Sorry, I could not think of any use of cascaded SG in cluster.
RajeshUnni
33 Posts
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July 23rd, 2012 06:00
Thanks dynamox .. This answer my question.
Raj
rockman18
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September 23rd, 2014 07:00
Can I remove devices out of one child group and put them in another non-disruptively? The devices are still in the parent group and unchanged. Will this impact the masking to the host?
rawstorage
419 Posts
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September 24th, 2014 04:00
Not right now, but watch this space..