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тАО12-23-2010 04:45 AM
тАО12-23-2010 04:45 AM
i'm currently using a Proliant ML350 G6 server as home for a couple of virtual machines.
and i have only one little issue
the performance this server delivers isn't really fast. and i heard some whispers that by the expansion of the battery this performance will increase. we currently have a 12MBps connection with the disks and want to improve this to as much as possible.
Thanks,
Wesley
Solved! Go to Solution.
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тАО12-23-2010 10:48 AM
тАО12-23-2010 10:48 AM
Re: Hp Proliant ML350 G6 - increasing performance
Using VMWare, increase RAM and CPUs. Installing a battery cache will help with write caching. I would not do VM without a pair of quad cores and 64GB of RAM.
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тАО01-05-2011 05:09 AM
тАО01-05-2011 05:09 AM
Re: Hp Proliant ML350 G6 - increasing performance
for your ML350 G6 you need one of the two:
534916-B21 HP 512MB Flash Backed Write Cache
534562-B21 HP 1G Flash Backed Cache
These modules do not require a battery. They have super capacitors to provide power to flash write cache memory.
What is your processors and memory configuration?
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тАО01-05-2011 06:09 AM
тАО01-05-2011 06:09 AM
Re: Hp Proliant ML350 G6 - increasing performance
can you give me those examples ? ( 1GB and 512 MB ) with batterys ??
Thanks a lot !
Wesley
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тАО01-05-2011 06:20 AM
тАО01-05-2011 06:20 AM
SolutionBBWC is not good choice today. FBWC is new technology replacement for BBWC.
The same level of protection, even better. And with FBWC you do not have to replace battery every 3 year.
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тАО01-05-2011 06:44 AM
тАО01-05-2011 06:44 AM
Re: Hp Proliant ML350 G6 - increasing performance
just give me a little explanation.
Why is FBWC better then BBWC.
i had a huge discussion about this with my boss. and according to him BBWC saves/continues your processes when the power suddenly shuts off.
that's why we want BBWC but if you havesomething to add on this feel free to do it.
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тАО01-05-2011 10:38 AM
тАО01-05-2011 10:38 AM
Re: Hp Proliant ML350 G6 - increasing performance
My only concern is flash memory does have limited life span in number of writes. I have seen flash memory get corrupted and you never know when this happens.
Is it better than a battery cache? I don't think so. So you replace a battery every few years. It is better than corrupted flash memory that might hold SQL data?
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тАО01-07-2011 02:04 AM
тАО01-07-2011 02:04 AM
Re: Hp Proliant ML350 G6 - increasing performance
"The HP flash-backed write-cache (FBWC) system offers important advantages over battery-backed write-cache (BBWC) systems. HP designed the FBWC with NAND1 flash devices so that power is not required to retain cache data. There is no longer a 48-hour battery life limitation and the data will be posted to the disk drive the next time you power up the server. HP has engineered the FBWC to function with long-life super-capacitors (Super-caps) instead of a battery. The Super-cap is only used to power the FBWC system during data backup. The result is that the FBWC retains cache data regardless of server power states and you can adjust maintenance and replacement schedules to accommodate the longer Super-cap lifecycle."
This cite is from
HP ISS Technology Update Volume 9, Number 2, page 2
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02231971/c02231971.pdf
I recommend reading this article, especially "FBWC architecture" section.
>> My only concern is flash memory does have limited life span in number of writes.
Remember, than cache memory module is not flash-based. Flash memory is used to backup
cache memmory in case of power loss. How many write cycles do you expect during life cycle
of the solution? Probably zero - if you have redundant power supplies and UPS.
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тАО01-07-2011 06:52 AM
тАО01-07-2011 06:52 AM
Re: Hp Proliant ML350 G6 - increasing performance
I had flash memory on my camera fail. Pictures were incomplete. The camera could not detect the failure. How does HP prevent this from corrupting data. If you have data from SQL in the flash memory, is it correct?
I tend to be conservative on technology advances. I know many who jumped on SSD drives in server storage and found it to be a major reliability issue.
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тАО01-07-2011 07:02 AM
тАО01-07-2011 07:02 AM
Re: Hp Proliant ML350 G6 - increasing performance
I understand your point of view. But you need to see, that the latest HP SA P812 (the biggest SA controller) has FBWC only. Similar as MSA2000/P2000 array controllers have FBWC only. I believe that HP engineers know what they are doing.