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January 7th, 2021 14:00
PERC Cachebypass Mode
h730 has a cachebypass setting that can be changed through perccli
But neither perccli manual nor poweredge-rc-h730/330-userguide provides any details of this mode.
CLI reference guide gives only information about the way to change it
I.E
This command sets the cache bypass size and cache bypass mode on a virtual drive.Input example:
perccli /c0/v0 set cbsize=0 cbmode=7
Options:
cbsize:
0 — 64k cache bypass
1 — 128k cache bypass
2 — 256k cache bypass
cbmode:
0 — Enable intelligent mode cache bypass
1 — Enable standard mode cache bypass
7 — Disable cache bypass
Where can I find information about Cachebypass Modes ? Specifically how "intelligent mode" is different from "standard" mode. what type of IO are bypassed, what are pros/cons of enabling/disabling this mode ?
DELL-Joey C
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January 7th, 2021 21:00
Hello,
Well, there is no proper documentation on the information that you're asking on. I too unable to provide a solid answer, mostly would be based on my opinion and knowledge.
Most of the configuration are set by default, and it's not recommended to amend it unless it's required or knowledgeable on what's needed to be done on the system.
Cache bypass are basically meant for built-in cache drive, i.e. SSD or NVMe. Here's some writing about RAID cache: https://dell.to/2Xs8J1X that I found on the net. You can refer to the Cache Block Size as it would be almost the same as cache bypass, it would be just a naming is different. As for Intelligent and standard, I do not have any good documentation to provide an answer, therefore I would not want to say something that may cause confusion, probably might need to wait for any users here in the forum to provide some light to it.