DL385 G2 with P400 Array Controller - Safe to upgrade Memory on RAID Controller?

We have the following setup:

HP DL385 G2
P400 Raid Controller with Battery Backed Write Cache module
RAID1+0 (4 x RAID 1 Mirrors). These drives are SATA III 7,200 RPM, 32MB Cache.

Q1 - The controller currently has a 256MB memory module, I see on Ebay you can get the 512mb memory modules for less than £20, can I simply shut the server down, change the RAM module then power up. All the RAID array will be as it was and all VM's on those HDD's will be in the same state?

Q2 - Is BBWC module different to the RAM or do they come as a pair? I assumed the BBWC is just the battery right?

Q3 - This should improve Read \ Write performance?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Q1 - Yes.

Q2 - Battery Backup Write Cache controller, depending on how it's listed, some come with the battery, and some come without the battery, the battery connects with a small white molex connector.

Q3. Comparing no BBWC, to adding one there is a noticeable performance difference to reading and writing. But 256 to 512MB - umm, not sure you will notice, depends on workload, OS...

I assume this is VMware datastore ?

I would spend more money on SATA drives.

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ProtecITAuthor Commented:
Hi (again) Andrew,

Yes VM Datastore. For £20 I think we'll give it a go.

Do you mean spend more money on SAS drives?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
SAS or more SATA....

more disks, better performance, even SATA!
ProtecITAuthor Commented:
Andrew hit the mark again!
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