New environment (passage of the Hyper-V) - Q p410i Raid

I am preparing to build a new VMWare environment.  We are currently using Hyper-V, so I'm learning along the way.  I just had a few quick questions:

We bought a new HP DL380 G7 server with the following basic specifications:

2 X 5650 processor

96 GB OF RAM

8 146 GB 15K SAS drives

P410i Raid Controller

Question 1:

The p410i controller does not have a BBWC or FBWC module.  Coming from a Hyper-V environment, it never asked a question, however, I have read several posts here indicating that a BBWC is ABOSLUTELY necessary with this controller for good performance of VMWare.  It will really make an interesting difference in our installation?  Everything I've read has dealt with versions prior to 5.0 ESXi, so is this always true with ESXi 5.0?  If it is true, I prefer to use a FBWC module, because of less maintaince and it is available in 1 GB 512 MB for the BBWC against.  However, everything I read says that it must be a battery module, which clearly would not be the FBWC.  That really makes a difference.

Question 2:

That nothing is currently on the server, what is the consensus on the RAID configurations for VMWare host computers?  Under Hyper-V, I've been running a Raid 5 on all disks (no hot spare ).  I was thinking either build it the same way, but with a spare, or rather using Raid 10 drive.  The box will host four Windows 2008 R2 based VMs, which is going to be housing a database SQL 2012 which was see a 4:1 write vs. read the output.  Limitations of space, which of these two options, offers the best performance in VMWare?

Thank you!

Brian

Welcome to the community,

using the memory cache write-back (BBWC/FBWC) made a huge difference (about factor x 10). Compared to Windows, ESXi does no write cache itself for reasons of security and fully relies on the disk controller. If you use BBWC or FBWC does not matter at all. Both use the same memory for caching. BBWC dampens memory for up to - I think - 72 hours, while FBWC has additional non-volatile flash memory function to store the memory cache in the event of power loss. This is why FBWC needs only a capacitor, rather than a battery. I'd certainly go with the most memory cache (FBWC in this case).

Regarding the RAID level to use. I haven't done any performance tests with local storage myself again, but I think with 8x15k discs and FBWC, you will probably see almost no difference in speed. I would go for a RAID 5.

André

Tags: VMware

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