VCAP – Design: Storage Calculation – Part 2

Storage, VCAP6 - Design
This post is a continuation of Storage calculation part 1; in this post we are going to talk about disk types and how we calculate IOPS and Disks for your Design Note: This post will show basic calculations and will not take into account caching and tiering technologies Disks types Now that we've covered the raid levels, let’s talk about the disk drives. In the enterprise world we normally see the following disk types: 7.2K RPM NL-SAS or SATA 10K RPM SAS or FC 15K RPM SAS or FC SSD When we are looking to design a storage system, we need to consider the following: IOPS RAID Write Penalty Application workflow IOPS = Input/Output operation per second. In spinning disks the numbers of IOPS are well known and they are…
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VCAP – Design: Storage calculation – Part 1

Storage, VCAP6 - Design
I will like to start a series of posts regrading VCAP design storage calculation and performance. we will start with the basics and build on it to more advanced topics. Raid levels: RAID - Redundant Array of In Depended Disks , RAID technology is a combination of in depended disks to form redundancy or create a better performance. There are many type of RAID levels but recently vendors start to use a few common raid levels:   RAID 0: RAID 0 technical details : Method: Block level striping , data is writing across all drives in the stripe set. Using RAID 0 will increase performance since we utilizing all drives from the RAID set at the same time. Fault Tolerance:  RAID0 DO NOT offer any fault tolerance, failure in one of the…
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