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ravi_vemula
2 Posts
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520
December 7th, 2013 07:00
regarding the queue depth calculation
I have a question regarding the formula LUN queue depth, EMC has the formula to calculate - (32+(14*LUN·s data drive quantity)).
I understand 32 is the HBA queue depth and i want to why they have included 14 and what it refers to.
Also could you please explain when the write cache re-hits will occur?
General Failure
2 Posts
269
0
Posted December 11th, 2013 09:00
I believe Write Cache Re-hits are when::
a. a data block written recently is written again while still in cache
b. a read can be satisfied by a block still in write cache from a recent write
Roger_Wu
6 Operator
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4025 Posts
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Posted December 9th, 2013 22:00
Maybe the disk queue depth?
The write cache re-hit will occur when the host performs a same write to LUN?