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Nagota
Asked: 2011-10-02 00:24:00 +0800 CST

Hard drives, how to calculate read and write speeds supported? [duplicate]

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Possible Duplicate:
dell 2T 7.2k nearline SAS 6Gbps- ingress/egress throughput

I don't have access to machine/drive, but need to define specs to purchase one.

What all things would it be dependent on? Using RAID 10, would improve it?

Would it be dependent on file size, which we read or write?

How to calculate latency of fetching a file segment? Seek time etc..

I need to use it with a web server, for storing and delivering large no. of small files. There will be continuous writes and reads 24x7 of small files. Any recommendations for which RAID to use, or no RAID should be used, based on writes or reads?

Say if I choose, dell 2T 7.2k nearline SAS 6Gbps- how to calculate ingress/egress throughput?

Edit (More info):

  • Raid Controller - PERC H700 Integrated RAID Controller, 512MB Cache, For x6 Backplane
  • 6 x 2TB Near Line SAS 6Gbps 7.2k 3.5" HD Hot Plug. I need atleast 8TB storage. Planning to use RAID 10.
  • Typical file size range: 100KB - 1MB
hard-drive web-server storage video-streaming iops

1 Answers

  1. Using RAID will improve it, but only if you choose an appropriate stripe size, if you have several small files, a smaller stripe size is recommended. And I think the only way to calculate is to put it to the test, every case is different.

    How many drives will you use? What raid controller will you use?

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