Hello Everyone,

Hoping I can acquire some tips from someone with prior experience in setting up the MD3200. I come from a FC IBM background so this is slightly different for me.. 

A little about my configuration

1 x MD3200 12 3TB 7200k drives (11 drives in a raid 5 with 1 global hot spare)

2 x Dell R620

2 x 6Gbps dual port HBA

Currently I have:

Port 0 of server 1 HBA connected to controller 1 port 0

Port 1 of server 1 HBA connected to controller 1 port 1

Port 0 of server 2 HBA connected to controller 2 port 0

Port 1 of server 2 HBA connected to controller 2 port 1

I have created 1 disk group raid 5 as stated above (27.236 TB) and 3 Luns,

1 GB

5TB

5TB

From this I have built a 2016 Hyper-V cluster. The issues I am facing is the write performance is extremely slow. I have deployed one virtual machine as a test. When copying files (5GB iso) from the local VM drive (Hosted on the SAN) speeds are fast 100+MB/s when transferring to the SAN the transfer starts out the same 100+ MB/s but then drastically drops averaging between 5-10 MB/s. I've been monitoring the current I/O latency and am seeing spikes from 0-200+ms. Everything on the SAN is claiming to be optimal. MPIO successfully installed, so I do not know what I am missing here. Hoping someone can give me a hand here.

 

Thanks in advance,

Kevin.