1500 VMs or more – blade servers are the better solution and remember to plan for multiple failure domains, maintenance mode and upgrades.
This is a real world example and is an important fact to consider… It can be frustrating when you’ve purchased your first two chassis with 4 blades per chassis, and then later on finding out the blade server technology has changed and now requires you to purchase upgrades for the chassis in order to use new generation blades. Rack mounted servers aren’t sexy but they’re much easier to scale capacity at a lower cost. This is the main reason why rack servers may be the better solution. If blade and chassis are already an established hardware standard then it’s a no-brainer to stick with the standard, however, if you are being sold blade and chassis right out of the gate and your IT operation is smaller than 1000 VM servers consider that HA will require spanning blade servers across 2 – 4 chassis. There’s obvious a sales benefit to blade and chassis over rack mounted servers and that’s why many sales reps will push them.
Individually managed servers (more IPs).įirst let me apologize to all my friends at Dell and HP, but I need to be honest here.
Uses more rack space (2 – 4U per server).
Nothing new for DC staff to learn (easy setup).
Smaller failure domain is easier to evacuate 1 host server (25- 30 VMs) if something fails.
Per server is cheaper (2 socket, 24 core, 192 GB memory – Approx.
Networking and storage configuration can get tricky requiring training staff.
Huge hassle when doing firmware upgrades of chassis, blades and other chassi components.
Remember when you maintenance these chassi, the VMs need to be vMotioned somewhere or powered off. 350 VMs in 1 fully populated chassis would require 2 (3 would be better) more fully populated chassis running at 35 – 70% utilized.
Higher density means a larger failure domain (Approx.
(1 Chassis, 16 blades and networking Approx.
Uses less rack space and square footage for higher density DC.
Uses less network ports (2 or 4 per chassis depending storage type).
First of all Blade and Chassis are Cool, especially UCS! (now that we have that out-of-the-way lets move on).
Are you trying to decide whether to use blade and chassis instead of rack mounted servers for virtualization? Here are the Pros and Cons of Blades vs Rack Servers… Pros of Blade and Chassis for VMware vSphere
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