HW RAID (dell/lsi) SETTINGS SSD ?

[mfpck]

Hello,

Historical I learned that write back and read ahead are the way to go with an bbu.

Because I see a few performance irregularities so I was reading a lot and it may seem that the recommend settings are write-through and no read ahead when using ssds ?

On top of that if I change the settings this way it seem to activate lsi/dells fast path feature....

Running here dell poweredge with enterprise ssds using h730 raid controller currently not read ahead and write back.

Does aynbody benchmarkt it or is able to clarify ?


Let' talk and test about it ;-)

Thx & Best

 

[waltar]

Did you already install perccli raid ctrl. tool from Dell ?
perccli /c0 set cacheflushint=1
Using fast path is correct.

 

[waltar]

As older ctrl. aren't supported anymore on Dell search here is still an older release available:
curl -C - -O 'https://downloads.dell.com/FOLDER04470715M/1/perccli_7.1-007.0127_linux.tar.gz'
tar xzvf perccli_7.1-007.0127_linux.tar.gz
cd Linux
yum localinstall perccli-007.0127.0000.0000-1.noarch.rpm
/opt/MegaRAID/perccli/perccli /call show

 

[mfpck]

Using storcli seem to work fine...
btw. percli also offers an dep file...

cacheflushint=1
is just optimize the cache frequency from 4 default to 1 right