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

 

[mfpck]

The weird thing is if I set my hardware raid 10 to write though and no read ahead which should also activate fastpath I will get worser pveperf result comapred to write back and read ahead !?

Super confused - Any ideas ?

 

[waltar]

Any hw-raid cache settings should be tested with used disks and differ from disk type, vendor, model, firmware and even your running workload. There is no fit in general when using ssd's while for hdd's in raid6 yes (never using hw-raid10 yet and for just a single raid1 tuning is not necessary).

 

[alexskysilk]

yum localinstall perccli-007.0127.0000.0000-1.noarch.rpm

This wont do much on a proxmox box

https://github.com/nbritton/make-perccli-deb-pkgs

sas2ircu (or sas3ircu) also work (HBAs) or megacli (Raid)

 

[waltar]

This wont do much on a proxmox box

That perccli is for a dell box with a perc and nothing else

 

[alexskysilk]

That perccli is for a dell box with a perc and nothing else

If there's no os, there's no need for the package. the controller has its own interface.

 

[waltar]

You don't want to shutdown the os and go into ctrl menue if you are available to check the raid volumes, disks and configs if you are available to do it on the running os too.

 

[alexskysilk]

ok I'm completely confused.

Is there an OS? or is it

a dell box with a perc and nothing else

If it has an OS that ISNT proxmox, why is the question in this forum?

 

[waltar]

Running here dell poweredge with enterprise ssds using h730 raid controller

I'm strongly assuming it's running proxmox pve but for testing raidset and ctrl. options it's much easier to do changes on the ctrl online from the pve instead of each time shutdown and switch to ctrl bios menue.

 

[alexskysilk]

options it's much easier to do changes on the ctrl online from the pve instead of each time shutdown and switch to ctrl bios menue

... and we come full circle.

A

Post in thread 'HW RAID (dell/lsi) SETTINGS SSD ?'

Jan 24, 2025

yum localinstall perccli-007.0127.0000.0000-1.noarch.rpm

This wont do much on a proxmox box

https://github.com/nbritton/make-perccli-deb-pkgs

sas2ircu (or sas3ircu) also work (HBAs) or megacli (Raid)

• alexskysilk

 

[waltar]

Aaaa, first use alien to convert rpm to deb one ... and then apt install ...
Or apt install dnf and then dnf install perccli...rpm