Uploaded image for project: 'Documentation'
  1. Documentation
  2. DOCS-828

conflicting recommendations for read-ahead settings on software raid

    XMLWordPrintableJSON

Details

    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major - P3 Major - P3
    • None
    • None
    • None
    • None

    Description

      From http://www.mongodb.org/display/DOCS/Amazon+EC2+Quickstart

      $ sudo blockdev --setra 128 /dev/md0
      $ sudo blockdev --setra 128 /dev/sdh1
      $ sudo blockdev --setra 128 /dev/sdh2
      $ sudo blockdev --setra 128 /dev/sdh3
      $ sudo blockdev --setra 128 /dev/sdh4

      From http://www.mongodb.org/display/DOCS/Readahead

      RAID on EC2: If you are following our Amazon EC2 guidelines, and running with multiple EBS volumes in a software RAID configuration, then the recommendation is to set the readahead to 0 on the volumes that make up the RAID array while setting the readahead to the value you want on the RAID volume itself.

      Attachments

        Activity

          People

            jsr Jared Rosoff
            rassi J Rassi
            Votes:
            0 Vote for this issue
            Watchers:
            3 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:
              10 years, 25 weeks ago