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Bvq use case presentation cost effective storage planning
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Bvq use case presentation cost effective storage planning


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  • 1. Find most economic disk setup with BVQ Michael Pirker +49 151 180 25 26 00Bsys2.pptx
  • 2. Target for this presentation • Target • a mail environment has to be moved from an oversized 10k 300GB storage to a new storage environment. The new environment shall use 7.2k 1TB drives with Raid 6. • BVQ is already installed so we can measure IOPS, RW Distribution and caching to do a most economic sizing • We analyze the performance of all disks that are involved • We can proof that 2500 IOPS are what we need • It is already known that R/W distribution is 55% Read • The diagram shows a constant read cache hit rate of 90% • The diagram shows a constant write cache hit rate (overwite in cache) of 15% SVC will put all write data on the cache but 15% of this data will be overwritten before destaging happens. These IOPS will never affect the disk. • Safety Margins We see a transfer rates which will improve write penalties for raid 6. ánd we use a conservative IO estimation for 7k drives. We do not take in account that the storage system may further improve IO behavior with of own cachingPage 2
  • 3. Select Volumes for performance analysis Make use of the BVQ Accounting Package Create a Volume Group of all Volumes that belong to the mail system Analyze the Volume Group now Without Accounting Package you can select all volume by search.Page 3
  • 4. Facts measured to support calculation • Requested • 40 TB Capacity • 2500 IOPS Cache Hit Read • Facts from Chart (4 work days) Transfer • 55% RW Distribution Size RW • 90% Cache Hit Read • 15% Cache Hit Write IOPS RW • Big Transfer size improves Cache “Write Penalty” for Raid 6 Hit Write (Full Striped Writes)Page 4
  • 5. Results with Spreadsheet • Target IOPS 2500 IOPS • RW Distribution: was measured before. Splits IOPS in R/W • Cache Hit Read: Reduces read IOPS with measured Cache Hit Rate • Cache Hit Write Reduces write IOPS (Overwrite in Cache ) with measured Cache Hit Rate • IOPS eff. is sum of read IOPS and write IOPS • The number of disks are now calculated with this formula Result is 48 Disks with 7.2kRPM Good fit because we need 40TB capacityPage 5
  • 6. What makes this result particularly valuable? • calculated based on facts decreased the number of needed Disks dramatically • most economic result • minimum of costly safety margin Other scenarios without knowledge about facts We assume Raid 6 and 50% read and 70% cache hit for read IOPSeff = 1625 72 Disks We assume Raid 6 and nothing more IOPSeff = 2500 201 DisksPage 6
  • 7. BVQ in the www • BVQ Website (still German will change to English until latest Feb 25. 2013) (German) (technical wiki with download – international) • BVQ Videos on YouTube • SVA Webseite von SVA GmbH Internationale Webseiten • Developer Works Documents and Presentations 7
  • 8. Page 8