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?