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Full Discussion: Raid 0 on database server
Special Forums Hardware Raid 0 on database server Post 302512438 by Puddles187 on Sunday 10th of April 2011 09:36:55 AM
Old 04-10-2011
With SSDs, really the only noticeable difference between them being in RAID 0, and being lone discs would be simplicity of just having one main disc, as opposed to a lot of different discs.

The only problem with RAID and SSDs is that AHCI mode needs to be enabled for TRIM support. Therefore, the RAID array will need to be declared in the OS, (the only OS that I've done it on so far is [cringe] Windows [/cringe] and that was a small nightmare) which can be done with mdraid. Also I've found that Linux doesn't even like to install onto a hardware-defined RAID array, I'm sure you could do it if you tried hard enough though, so you would need a separate boot disc for two reasons now (the OS defined array, and the Linux not liking RAID 0 instillations)

Another thing that should be mentioned is that although you are using SSDs, if you are making an OS defined array, the boot time will be drastically increased for every disc that you add to the array. However, this should not be all that much of a problem for a datacenter.

I hope this helps, good luck!
 

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LEARN ABOUT NETBSD

ataraid

ATARAID(4)						   BSD Kernel Interfaces Manual 						ATARAID(4)

NAME

     ataraid -- software BIOS RAID

SYNOPSIS

     pseudo-device ataraid
     ld* at ataraid? vendtype ? unit ?

DESCRIPTION

     The ataraid driver provides support for BIOS-based software RAID controllers.  These are devices which have some simple support for several
     basic RAID levels (often RAID 0 and RAID 1), but which require software support to actually perform the RAID function.  The BIOS support is
     largely just to create and recognize the array so that it may be a boot device.

     The driver currently supports RAID formats from:
	   o   Adaptec HostRAID (found in Intel 6300ESB)
	   o   Intel MatrixRAID
	   o   JMicron RAID
	   o   nVidia MediaShield
	   o   Promise FastTrak
	   o   Via V-RAID (found in many VIA-based motherboards)

     Status of the logical disk as well as the disks associated with it, can be viewed through the bioctl(8) utility.

SEE ALSO

     ld(4), bioctl(8)

HISTORY

     The ataraid driver first appeared in NetBSD 2.0.

AUTHORS

     The ataraid driver was originally adapted from FreeBSD by Jason Thorpe <thorpej@NetBSD.org>.

BUGS

     Not all features of the software RAID are currently recognized or supported.  For example, the Adaptec support doesn't recognize when a RAID
     1 should be in a ``building'' state, and it does not do the right thing.

     At least part of the reason for this is that the publically-available information on these formats is quite limited.

BSD
								September 16, 2008							       BSD
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