HP DL360p G8 raid speed

[chris884]

Server: HP DL360p G8

Raid: Smart Array P420i/2GB+FBWC

HDD: 4x512GB SSD Samsung 840 Pro (RAID0 stripesize 256kb)

OS: Windows 2008 R2 64Bit

Hi,

Problem is that read/write operations are really slow and windows hangs after some time for some seconds/minutes. Tried many differnt settings via HP SSA but still no clue why speed drop so rapidly?

[kazuza]

What settings do you have configured for that array?
I'm not sure OEM drives [even being SSD] are supported) on hp server controllers ...

[chris884]

I tried many different configs, stripesizes and so... Don't know what's best config to get max speeds and no freezes...

[kazuza]

Does this array contains the logicalunit of your system drive?
Can you dump the config of your cntroller??

[chris884]

I attached a log file, if you ment that? Well config set to standard config, SSD Smart Path is enabled, but log says cache is not configured...

[kazuza]

I'm not sure that controller supports those SSD's out of the box, but let's try this:

Your array is not initialized. Do´n't know why

But let's try to enable caching
Make sure you have latest HP SSA cli (Smart Storage Admnistrator cli ) installed.
Open a commandr prompt on hpssacli.exe location and type these commands in sequence:

set target controller slot=0
modify drivewritecache=enable

then do a :

show config detail

and post the result here

[chris884]

attached config ......

[kazuza]

Is that server on production yet?

Can you destroy that array and create a raid5 and post the config ?

Maybe the controller detects the ssds are fast enough to disable caching in raid 0 ??

You can also try to force the acche ratio to change:

set controller slot=0

modify cacheratio=50/50

and see if the cache sets to enable and the ratio stays 50% write 50% read ...

[chris884]

Yes i can do, but i have to relinstall os, i will write back when finished

[chris884]

Seems that the samsung 840 doesn't have good compatibility with the p410i raid.. If anyone has an idea let me know, so far i don't know..., changing raid level slow speed, changing stripe size slow speed...