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July 12th, 2013 03:00
VMAX Devs Concepts
We use a std convention i.e. if the dev is below 1 TB we make a hyper of size 34 GB i.e. 38000 cylinders. Now if i want to create a device of 500 GB then i will need 500GB /34GB i.e. ard 15 devs of 34 GB each
Suppose i form a meta say AAA with 15 devs of 34 GB each and bind it to a pool say T1 : RAID-5 (7 + 1). Then how the device will be distributed.
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Fenglin1
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July 14th, 2013 18:00
Using Thin meta, the data will distributed in Thin Pool spreading workload over more spindles, same as using Thin Device. But each meach meta member gets a small percentage of cache, a striped meta is likely to offer more writable cache to the meta volume
red1918sox
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July 12th, 2013 05:00
Are you using thin pools?
lampard1804
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July 12th, 2013 06:00
Yes
Quincy561
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July 12th, 2013 08:00
With thin pools, your devices will be spread over the TDATs in a round robin fashion in 768k chunks.
Quincy561
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July 14th, 2013 19:00
Each member gets 5% of writable cache, which is a lot, considering many systems have millions of slots.
The amount of available write space makes little difference in most cases.