Get Your GeekOn With Ron - Session Two: Local Storage vs Centralized Storage Models
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Get Your GeekOn With Ron - Session Two: Local Storage vs Centralized Storage Models

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Join virtualization expert and industry veteran Ron Oglesby as he discusses local storage vs centralized storage models for VDI, including the arguments for and against local storage in VDI ...

Join virtualization expert and industry veteran Ron Oglesby as he discusses local storage vs centralized storage models for VDI, including the arguments for and against local storage in VDI environments, a review of converged platform models (ie Nutanix) for VDI, and SSD tips and tricks

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Get Your GeekOn With Ron - Session Two: Local Storage vs Centralized Storage Models Get Your GeekOn With Ron - Session Two: Local Storage vs Centralized Storage Models Presentation Transcript

  • GeekOn Discussion:Local Disk vs ‘The SAN’ for VDI Storage Ron Oglesby @ronoglesby #GeekOn
  • Agenda Who cares about this session anyway?  Why is disk so important in VDI?  What are the key concepts to understand about VDI and Storage Then…  Why Local Storage rules for VDI  Why Local Storage Blows and You should ONLY use SAN storage for VDI
  • Disk for Desktops? Who cares? How many disks does it take to support 25 desktops?
  • Disk IO Understanding LimitationsSome References!http://www.techrepublic.com/blog/datacenter/calculate-iops-in-a-storage-array/2182http://www.yellow-bricks.com/2009/12/23/iops/
  • Desktop IO Requirements? Read:Write ratio can be as high as 50:50  60:40 to 70:30 is typical Light Users = 4-5 IOps Medium Users = 8-10 IOps Heavy Users = 14-20 IOps So if you have 50 medium users 400-500 Sustained IOps So if you have 75 users/server? 750 IO? 4 disks before RAID penalty?! 8-10 or more after penalty? But what about boot / login storms?
  • Boot/Login Storms At boot and login IO can be extreme  Even a medium user can generate 90-100 IO at login (why is that 100 IO a ‘magic’ number?)  Boot storms can be even worse The “good” thing about a boot storm is that it is typically 90% Read!  No RAID penalty  Caching Helps Still must be planned for.
  • Disk Costs and VDI Dell 143 GB SAS 15K SAS Drive = $ Dell 100 GB SSD Drive =$$ EqualLogic SAS drives $$ EqualLogic SATA drives = $ EqualLogic SSD drives= $$$ Windows 7 “Thick Provisioned” 20-35GB Windows 7 Linked-Clone = 8-10GB
  • Local Storage is the Solution to this Problem
  • Local Storage Start with these questions:  How many of you boot your normal desktops from the SAN?  How many of you boot your terminal servers from the SAN?  How many of you have an extremely short SLA on recovering your desktops?
  • Why do people talk down local DAS Storage companies make a lot of money selling centralized disk and the software around it. More power to them! Hypervisor’s “BIG” features require centralized storage- helps push all that higher end licensing Tools supplied by hypervisor vendors don’t work without centralized storage.Copyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
  • Local Storage is about Perf vs Cost Dell PCs can cost as little as $350! Performance requirements require High end disk Writable GB cost local vs SAN (SAS 15k)  RAID 1 143GB Drives $5/GB – SAN 15K $10-30/GB Writable GB cost local vs SAN (SSD)  RAID 1 143GB Drives $5/GB – SAN SSD $30-70/GB Why pay for centralized storage for a desktop?!
  • That’s ALL BSSAN is the Solution to this Problem Local Storage is too limiting
  • Things this guy isnt telling you! HA, DRS, FT, E-I, E-I –OH…. Not available with local disk! You might not even have enough spindles! Local/CHEAP SSD isnt that great. IO can be handle cost effectively on the SAN Storage Tiering/Data movement all but impossible with local disk Dynamic Capacity/Cloud? Not happening with local disk.Copyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
  • All the features you love… Do I really need to detail them all? HA DRS FT SRM Storage vMotion Etc Etc
  • Spindle Count??? 50 users per server at 20 IO each= 1000 Iops 100 users/server @ 10… Boot / Login Storms? RAID Penalty for writes? DL 360’s have 6 drive bays. 15K drives at 180 IO each  1080 IOps before RAID penalty? Are you a Blade shop? Probably wont even get enough spindles in a server
  • “Cheap” SSD Issues So you move to SSD instead of rotating disk… $$$$ 149 GB SSD on Dell 610 $4,599.00 $$ 100 GB SSD on Dell 610 $1,949.00 Compare to 146GB at $359 on the same server. Can you even get enough writable space on those SSD? Better to use SSD for just hot data rather than all data
  • Handle the IO with mixed disks Leverage Hybrid Arrays  EqualLogic XVS  EMC FAST Systems SSD / EFD can be used for HOT data Smart systems will MOVE the data Can also be used for writes!
  • What about that whole Dynamic Cloud? Data Tiering  About placing data on the type of disk it NEEDS. Not fixed provisioning  Moving data from slow, to fast to REALLY fast disks  Only moving small parts of data not whole VMDKs?!?! Elasticity in the VM environment  Dynamic increases/decreases in capacity  Provisioning times increase – sometimes dramatically  Recovery and flexibility in the toilet
  • So what does Unidesk think? We don’t care…. So what to we do?
  •  roglesby@unidesk.com @ronoglesbyCopyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
  • Open Q&A