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MD3200 SAS Drive Performance
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.
DELL-Sam L
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February 1st, 2018 08:00
Hello Kevin,
Since you have a Dual controller MD3200, our best practice is to cable each host to both controllers. Here is a link to our Deployment Guide & if you look on page 16 it shows you how you want your cable you MD3200. http://downloads.dell.com/manuals/common/powervault-md3200_deployment%20guide_en-us.pdf
Also, you will want to make sure that you are using the MPIO drives from the Resource DVD & not native MPIO. Last thing is to make sure that your multipathing is set to Round Robin.
Please let us know if you have any other questions.
Kteixeira
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February 1st, 2018 09:00
Hey,
Just wanted to mention an oddity. On host one after changing MPIO policy to round robin with subset shows one path Active/Optimized and one Active/Unoptimized. On the second host one path is Active/Optimized and the other is in standby. I attempted to make it Active/Unoptimized however it keeps resetting back to standby.
Kteixeira
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February 1st, 2018 09:00
Hello and thank you for your reply!
My apologies I messed up my description regarding my connections. Each server has a dual port 6Gbps HBA with one connection to each controller.
Port 0 of server 1 HBA connected to controller 1 port 0
Port 1 of server 1 HBA connected to controller 2 port 0
Port 0 of server 2 HBA connected to controller 1 port 1
Port 1 of server 2 HBA connected to controller 2 port 1
MPIO drivers were installed from the latest resource DVD.
I will change each of my multi path to Round Robin. This is the only change I will have to make. Will do some testing and get back to you. Thank you again for your response!