Tuesday, April 06, 2010

How to Create RAID0 with single HDD by using Dell SAS5iR / SAS6iR?

If you ever go into SAS5iR / SAS6iR configuration BIOS, you will notice that it require at least 2x Hard Disks to configure RAID0. I have to say this is just as per design, and it is not refers to bug or limitation.

Some of you may wondering if you're using Windows Small Business Server 2003/2008, which have the limitation of having 2TB for C:\ , and yet you don't want to convert it into Dynamic Disk; or you totally don't need that huge space for your C:\, and the server already in front of you. Stop to blame the design or the Sales person of not inform you about this, but refers to below workaround.

Workaround (I):
1. Go to SAS5iR /SAS6iR Configuration BIOS which is Ctrl +C, delete all RAID0 or RAID1 configuration.
2. Exit the BIOS, then proceed the OS installation through:
11th Gen Server:
~ Unified Server Configurator (USC) or Installation DVD (Dell System Tools & Documentation)
8th - 9th Gen Server:
~ for this generation, do not support USC, so we need to depend on Installation CD/DVD which can ease the installation process of end user.
3. However, with treated this card as a 'pass-through' SAS interface controller card, you will notice one of the HDD LED light (status LED) will not light up.

Dell did explain that in their Knowledge base:

Explanation:
When hard disk drives are attached to a SAS5/iR or SAS6/iR as a single disk (not part of a RAID0 or RAID1) the status Light Emitting Diode (LED) will not illuminate. The LED is not a representation of power to the drive. It is a representation of the drive status or availability within an array. Since a single drive Redundant Array of Independent Disks0 (RAID0) cannot be created on a SAS5/iR or SAS6/iR, the status light will remain off for single drive usage.
Workaround (II):
1. Check with Technical Support or Sales whether the Model of the server that you own is support PERC series of SAS RAID card or not.
2. If so, you may consider change the card to PERC6i (for 11th Gen) or PERC5i (for 9th & 10th Gen).
3. PERC series able to create RAID0 with single HDD.

*However, the price of PERC series is much more expensive than SAS5iR/ SAS6iR.

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