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December 10th, 2013 01:00
Separate pool for file - reasons?
Hello,
I read in many documents to avoid mixing file and block LUNs in one storage pool. Unfortunately, I did not find the reason why to avoid such configuration. Can anyone explain what is the root cause not to mix file and block into one storage pool?
Thanks a lot.
Lukas.
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GearoidG
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December 10th, 2013 02:00
One thing that springs to mind is that FASTCache should not be used with the savvol for checkpoints
HTH
Gearoid
LukasBelovsky
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December 10th, 2013 03:00
Hi Gearoid,
I agree with you.....for this particular case.
What about case when I use homogenous pool, no FAST, no FAST Cache, no other advanced features?
There must be some simple reason why not to mix it together.....
L.
GearoidG
251 Posts
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December 10th, 2013 04:00
One of the other reasons is single point of failure at the storagepool level or raid level within the pool
regards
Gearoid
dynamox
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December 10th, 2013 06:00
Block Dedupe and Block Compression is not supported with VNX OE File LUNs
Good paper to read
VNX Unified Best Practices for Performance Applied Best Practices Guide
dynamox
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December 10th, 2013 07:00
you will hear EMC talk about separating workloads because block workload is typically small size i/o and random and your typical NAS shares could be much larger i/o size and sequential ..and how this might have negative impact on system cache utilization. Honestly in my shop i use the same storage pool for block and file, my file workload is very modest so i have not seen any negative impact in performance. But you know EMC, you open a ticket about performance issue and they see that you are sharing that pool, they will use that as an excuse to blame that, whether is has anything to do with your issue. I am willing to fight that battle, so be prepared
LukasBelovsky
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December 10th, 2013 07:00
Finally! Thanks for sharing your own experience.
Lukas.
LukasBelovsky
21 Posts
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December 10th, 2013 07:00
Hi guys,
thaks for your answers. Unfortunately both of you considering usage of the advanced features which avoid mixing file and block on one storage pool. I read the whitepaper Dynamox adviced. Very nice one, but still lack of explanation of the best practice.....
What is the situation in simple config - NO advanced features, one homogenous pool. Should I still avoid mixing file and block? Why?
Thx.