Baza znanja: Synology NAS
Synology: Razlika med običajnimi in RAID diski
Posted by Marko Lipovec (Import), Nazadnje spremenjeno s strani Marko Lipovec (Import) on 29 March 2012 09:09 AM
Za strežnike, namenjene krtičnim podatkom v podjetjih priporočamo uporabo diskov RAID, namenjenih prav napravam NAS.

Originalen tekst (WesternDigital -WD):
http://wdc.custhelp.com/app/answers/detail/a_id/1397

Difference between Desktop edition and RAID (Enterprise) edition drives

Answer ID 1397   |    Last Updated 01/19/2012
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Western Digital manufactures desktop edition hard drives and RAID Edition (RE) hard drives. Each type of hard drive is designed to work specifically as a stand-alone drive, or in a multi-drive RAID environment.

If you install and use a desktop edition hard drive connected to a RAID controller, the drive may not work correctly. This is caused by the normal error recovery procedure that a desktop edition hard drive uses.

NOTENote: There are a few cases where the manufacturer of the RAID controller have designed their cards to work with specific model Desktop drives. If this is the case you would need to contact the manufacturer of that controller for any support on that drive while it is used in a RAID environment. Desktop Class Hard Drives are tested and recommended for use in consumer-type RAID applications (RAID-0 / RAID-1). For more information about using a Desktop hard drive in a RAID please see Answer ID 996: Support for WD desktop drives in a RAID 0 or RAID 1 configuration.

When an error is found on a desktop edition hard drive, the drive will enter into a deep recovery cycle to attempt to repair the error, recover the data from the problematic area, and then reallocate a dedicated area to replace the problematic area. This process can take up to 2 minutes depending on the severity of the issue. Most RAID controllers allow a very short amount of time for a hard drive to recover from an error. If a hard drive takes too long to complete this process, the drive will be dropped from the RAID array. Most RAID controllers allow from 7 to 15 seconds for error recovery before dropping a hard drive from an array. Western Digital does not recommend installing desktop edition hard drives in an enterprise environment (on a RAID controller).

Western Digital RAID edition hard drives have a feature called TLER (Time Limited Error Recovery) which stops the hard drive from entering into a deep recovery cycle. The hard drive will only spend 7 seconds to attempt to recover. This means that the hard drive will not be dropped from a RAID array. While TLER is designed for RAID environments, a drive with TLER enabled will work with no performance decrease when used in non-RAID environments.

STOPCritical: WD Caviar Black, Caviar Green, and Caviar Blue hard drives are not recommended for and are not warranted for use in RAID environments utilizing Enterprise HBAs and/or expanders and in multi-bay chassis, as they are not designed for, nor tested in, these specific types of RAID applications. For all Business Critical RAID applications, please consider WD’s Enterprise Hard Drives that are specifically designed with RAID-specific, time-limited error recovery (TLER), are tested extensively in 24x7 RAID applications, and include features like enhanced RAFF technology and thermal extended burn-in testing.



Originalen članek na:



Support for WD desktop drives in a RAID 0 or RAID 1 configuration

Answer ID 996   |    Last Updated 01/19/2012
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WD desktop hard drives (Caviar Black, Green, and Blue) have been tested and are recommended for consumer RAID applications when using the drives in a RAID 0 (Stripe) or RAID 1 (Mirror) configuration.

However, there are several things to keep in mind when setting up a RAID with these drives:

  • WD only recommends using a Desktop drive in a RAID array with no more than two (2) drives (Raid 0 or Raid 1 only).
  • WD is unable to provide direct technical support for setting up RAID arrays for either hardware or software arrays.
  • Support for your RAID array can be obtained from one of several sources:
    1. If you are setting up a hardware array it is best to contact the manufacturer of your RAID controller or motherboard manufacturer.
    2. If you are setting up a software array you can contact the publisher of your RAID software.
    3. The publisher of your Operating System (OS) (Usually Apple, or Microsoft) can provide support for the use of a hardware or software RAID configuration within that OS.
  • Before connecting a drive to an array, you should verify that the drive is functioning properly. Please use Data Lifeguard Diagnostic for DOS (floppy)Data Lifeguard Diagnostic for DOS (CD), or Windows Data Lifeguard Diagnostics to perform a test on the drive prior to installation.
  • NOTENote: Before testing your drive, WD recommends creating a backup of any data on the hard drive, removing the drive from the RAID controller, and attaching the drive to a standard SATA controller. For specific instructions on how to use our diagnostic utilities, please see the links below:


    STOPCritical: WD Caviar Black, Caviar Green, and Caviar Blue hard drives are not recommended for and are not warranted for use in RAID environments utilizing Enterprise HBAs and/or expanders and in multi-bay chassis, as they are not designed for, nor tested in, these specific types of RAID applications. For all Business Critical RAID applications, please consider WD’s Enterprise Hard Drives that are specifically designed with RAID-specific, time-limited error recovery (TLER), are tested extensively in 24x7 RAID applications, and include features like enhanced RAFF technology and thermal extended burn-in testing.

    For more information on the differences between a RAID Edition (RE) drive and a Desktop drive please see Answer ID 1397: What is the difference between Desktop edition and RAID (Enterprise) edition hard drives?.

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