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Tuesday 14 July 2009

How the SAP hard disks are structured

SAP uses are a lot of hard disk space, not only for the application but also for the data that it stores.
Both of which are very important and therefore we need to use a method in which we can recover data in case of disk failure. For this reason we use RAID – “Redundancy array of inexpensive disks”

The two types of RAID SAP recommends is RAID 1 and RAID 5

  • RAID 1 uses two disks and is a mirror of each disk. If one disk fails, replacing it will recreate the data.
  • RAID 4 uses three of more disks. It uses striping where data is written across many disks to improve speed and parity. Therefore if one disk fails, it can be replaced and the data would be recreated.

The minimum recommended structure is to have

  • RAID 1 disk with the Operating System, Page file, Temporary Database, SQL Executables, SAP Executables and the transaction log.
  • RAID 5 disks would only hold the database.

The recommended structure is to have a three RAID 1 and one RAID 5 setup.

  • RAID 1 disk with the Operating System, Page file, Temporary Database, SQL Executables, SAP Executables and the transaction log.
  • RAID 1 disk with the Temporary Database, SQL Executables and SAP Executables
  • RAID 1 disk with the transaction log.
  • RAID 5 disks with only the database.

Both the minimum and recommended structure should have the RAID disks partitioned as below

  • C Drive: (RAID1) Operating System
  • D Drive: (RAID1) Page File
  • E Drive: (RAID1) Temporary Database
  • F Drive: (RAID1) SQL Executable and SAP Executables
  • G Drive: (RAID1) Transaction Log for the database
  • H Drive: (RAID5) Database

The disks should be formatted in NTFS.

Posted by Sandman at 16:45
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2 comments:

  1. mySAP FI15 July 2009 at 04:20

    Hi Sandman

    I just came across your site thru sapdocs.info and wanted to say that I’ve really interested reading your posts. Because my background is SAP FI, I have a few experience on SAP Basis. Looking forward to reading more from you!

    Regards

    ReplyDelete
  2. Sandman15 July 2009 at 09:36

    Hi mySAP FI

    Thanks for your comments. Its always nice to hear that people are reading and appreciate my posts.
    I will continue to add to this post as I learn and hope that others can learn from them.

    I have added your link to my external links section and would be grateful if you could do the same.

    Regards
    Sandman

    ReplyDelete

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