ProLiant Servers (ML,DL,SL)
cancel
Showing results for 
Search instead for 
Did you mean: 

batterh backed cache forRAID controller

 
SOLVED
Go to solution
donkarnash_1
Frequent Advisor

batterh backed cache forRAID controller

Hello,
We have ML570 G4 server which runs windows 2003 server and I have Oracle 10g db on it. The disks are RAID6 (i know that is slow) and want to get HP 512MB w/Battery Smart Array Battery Back Write Cache Enabler for the RAID controllers so the write to teh disks can be faster.
Can someone advise how can I do that.
IS it just an add on to the card/server ?
Is it easy to install ??


20 REPLIES
KarloChacon
Honored Contributor
Solution

Re: batterh backed cache forRAID controller

hi donkarnash

it's pretty easy just follow this video
look in the list for "BBWC cache module"

http://h20181.www2.hp.com/plmcontent/NACSC/SML/results.htm?SID=1842779&MEID=43C6F100-12FD-47D9-B7B6-FC9CF1B89CA9

also you can check this PDF, pages 59-61
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00673473/c00673473.pdf

regards
Didn't your momma teach you to say thanks!
predrag81
Valued Contributor

Re: batterh backed cache forRAID controller

Hi friend,

first you must pay attention on which SA controller you have and than when find out compatible cache modul you just turn off server and upgrade your controller.

There is no propositions, don't be affreid.

Kind regards,
Predrag
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

we have HP Smart Array P400 Controller and HP Smart Array P800 Controller (for the MSA)

Thanks for the reply, I will have to get in touch with my HP acc manager and get the part.

Can someone ecplan what is the benefit of the Battery Back Write Cache module ?

Will it make a significant difference ?
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

quick review about BBWC

http://articles.techrepublic.com.com/5100-10878_11-6064529.html


before updating to 512MB kit (I think you already have 256 with battery for your P400)

update Firmware to latest for the p400 and driver, also test using different values for Read/write in your ACU if that does not work go for 512 kit

regards
Didn't your momma teach you to say thanks!
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

Thanks to all who replied. I checked the array controller settings and have attached the file.
The disks are takign a lot of hit and that is the issue.
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

Do I already have the battery backed cache for the controller ??

how can I get the disks to write faster ?
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

yes you have already 512 MB in those so nothing else to for cache

what do you mean by "The disks are takign a lot of hit and that is the issue."???

are HDDs in both controllers writing slow?
the only difference p400 50% R - 50% W --- p800 25% R - 75% W

I see firmware is the latest but what about drivers?

regards

Didn't your momma teach you to say thanks!
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

Hi Karlo,

I have just installed the latest firmware 8.2 from the CD and thought that should have updated the drivers for the HDD too.

The HDD graph under performance is always thru the roof.
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

Karlo,

Thanks for the link, so you reckon if I update the drivers, that should make any difference ??

What else can I do to improve the HDD performance ???
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

I don't have all the information in my mind right now (I can get it tomorrow)

but I remember there was an issue with p400 controller and the workaround was update firmware (done), driver (link above) and I think there was something else (that's what I say I can check tomorrow)

talking about megas what is the speed? have any info about it?

regards
Didn't your momma teach you to say thanks!
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

What is megas ??? Sorry not a sys admin, so don't know.
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

I mean when you copy files what is the speed? megabytes? I see write is low very low but what is the real speed you are getting?

Didn't your momma teach you to say thanks!
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

I don't copy files, we load files to the db from flat files and when I look at the performance tab the HDD is thru the roof
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

so

what about when you copy files between controllers? or between logical drivers same results?

I ask this since I am not database expert so I really did not get this "we load files to the db from flat files"...
Didn't your momma teach you to say thanks!
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

The files are copied from one logical drive to another but still the HDD are hit hard.
predrag81
Valued Contributor

Re: batterh backed cache forRAID controller

Hi,

i don't understand what are you talking about.
First, you must better to explain mentioned situation.
If you have DB maybe problem isn't in logical drives. Maybe you don't have enough physical memory?

Kind regards
donkarnash_1
Frequent Advisor

Re: batterh backed cache forRAID controller

Sorry,
Maybe I shoudl explain. We have Oracel 10.2.0.4 db which reads large flat files and loads data into a temporary table and then does some aggregation of the data and then loads them to another table.
I have 4G of RAM and have allocated about 4.5 to the db and have about 1.7G free for the server.
The db does not show much load but when the flat files are read and loaded to the db, the HDD are taking a lot of hit.
I hope this makes it a bit clear on what I wanted to say.
KarloChacon
Honored Contributor

Re: batterh backed cache forRAID controller

so basically only in that activity the speed is slow when there is no DB activity speed(write) is fine?

Didn't your momma teach you to say thanks!
predrag81
Valued Contributor

Re: batterh backed cache forRAID controller

Hi,

I think that raid 6 and Windows installation on it is responsible for that. Maybe you should install Win OS on two mirrored disk and DB put on second RAID5 with spare array.
But now, I don't know my friend.
This is storage priority:)

Kind regards,
Predrag