Originally Posted by danewfie;11709472
That is a loaded question.
What raid card are you using? My preference would be to use raid5.
There are variations of your chip. If i'm not mistaken its most likely an integrated raid card. If that is the case your performance would be slightly lacking. If it actually has a dedicated sodimm with 1 gig memory then you should have no problems running all those operating systems on the machine. Given they all are not trying to read at the same time.
I would not go the route of installing anything on a usb key.
Nothing wrong with installing it on a USB key. I have it that way, with the USB key installed on the USB port on the motherboard (i.e. inside the chassis).
We do that for almost all of our ESX servers that we deploy for clients. It's a bare metal hypervisor with minimal I/O requirements anyways.
Originally Posted by elec999;11708658
I have a damn good dell server, 24cores, 32gb ram. Cant remember the cpus model right now. It has a perc6i in it. I want to install Vmware ESXi 4.1 on it. Right now it had 6x500gb Western Digital blacks,. Should I go for raid5 or raid10. I would get new drives at 1tb. My biggest concern is the IO. I will run development testing vms on it, and some productions. So about 5-8 running VMs running Linux/Windows at any given time.
Is it a good idea to install the os on a usb key, and use the drives for datastore.
It would be an easier choice if you had 8 drives
But in general, it depends on what virtual machines you're going to be using. I think RAID-5 would be more than enough for development purposes. I ran my T710 with 8x160GB in RAID-5 for a while, but switched to RAID-10 when I added a second array and also an iSCSI SAN.
If you think 1.5TB is enough space, then go with RAID-10. Otherwise, go with RAID-5 or RAID-6 to maximize available space.
Oh, and you only need a 1GB USB key...
5-8 VMs on that kind of hardware is nothing. Seriously. That's a puny load - even if you gave the each of the VMs 4vCPU and 4GB of RAM...
At the most, I was running 23 VMs on my ESX host - granted, not with 4GB of RAM each, but didn't have a problem...
Just realized I didn't really answer the question.
If you're running an VMs that will contain a large number of small files that will be constantly accessed and modified, then a RAID-5 array may not be the best - i.e. a production file server. That's one scenario that I think a RAID-10 array would be better.
SQL VMs should run just fine on a RAID-5 array, though again, that depends on how heavily the database is being accessed.
So, what VMs are you going to run? i.e. what server roles?Edited by ComGuards - 12/19/10 at 8:59pm