vSphere

Some questions about Data stores and LUN |VMware Communities


Hi everyone,

I am learnng VM sphere, have some questions:

 

1) Does single LUN can have exactly single disk or it can have more?

 

2) Assuming single LUN can have multiple disks, Let’s say we have two disks :

D1, I/0=100/sec

D2 ,I/0=100/sec

These two disks are mapped to LUN0. Further more, LUN0 is mapped to DataStore0.

What is the maximum I/O Datastore0 can handle? is it 200/sec because it contains two disks each with 100/sec I/O?

 

 

3) Let say we have two Datastores:

Datastores1 has one LUN0 , LUN0 can support 100/sec I/O.

Datastores2 has two LUN1, LUN2, each LUN can support 100/sec I/O.

Will Datastore2 support max 200/sec I/O total ?

 

 

4) Please see the following set up.

 

 

EXSI:1

VMk1 9.9.9.9 –VSW1–VMNIC1—SW1—–9.9.9.10-ISCSI TARGET( LUN)

 

Above VMK1 is used for storage, SW1 is dedicated switch for Storage. Should we enable JUMBO frame on SW1 and VSW1? What is VM’s recommendation?

 

 

When I did the packet capture, I see a lot of full sized frames, each write operation can be up to 1M bytes of block. So if a VM performs a single Write of 1M bytes, it will require transmission of many IP packets. Considering this, enabling jumbo frames will reduce transmission of many frames needed for single Write.

I am curious about VM’s recommendation if there is one.

 

Thanks and have a good weekend!!



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