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• Data and Technology

  Posted on October 16th, 2006

  Written by cliff

  Tags

  adaptec, Alan Baker, disk, faq, HowTo, kernel, kernel module, linux, lun, mkinitrd, modules.conf, multiple luns, raid, raid array, RHEL 3, RHEL 4, scsi, scsi channel, scsi RAID array, storage

  Making RHEL 3 See Multiple LUNS

  

  For some reason RHEL 3 comes out of the box configured to see only the first Lun on a SCSI channel. This is usually not a problem, as the first Lun is all you care about, but in some instances, you will need to configure the SCSI module to see multiple Luns.
  In this case [...]

• Data and Technology

  Posted on September 8th, 2006

  Written by cliff

  Tags

  checksum, computer, database, database performance, dba, disk, disk speed, hardware raid, mysql, old thinking, oracle, parity, performance, raid, raid 1, raid 10, raid 5, raid array, raid controller, raid types, raid volumes, software raid, storage

  Why Modern RAID 5 is Ideal for Oracle Databases

  

  There is a convention of thought amongst Oracle DBA’s that databases should never be installed on disks that are configured into a RAID 5 array. The argument goes, that since Oracle accesses and writes to random points within relatively large files, the overhead of constantly calculating block-level parity on these files is substantial, resulting in [...]

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