RAID 1 + 0 with LVM Post: 93721

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Operating Systems Solaris RAID 1 + 0 with LVM Post 93721 by pressy on Wednesday 21st of December 2005 02:42:45 PM

12-21-2005

Registered User

what type of storage are you using? if sun recommend you to use it, it will have a reason, what did you ask them?

a raid 1+0 is for sure the best way to build a high availability "disk" and the fastest, but to be honest with you, the most of my costumers don't use it, because it is the most expansive way, too. it costs exactly the double money of your space.... you lose 50% of your disks.... with 4 disks it doesn't matter, but think about 2TB luns Smilie

so if you make a raid 5 with 10 disks, you would only lose 1 (10%), 20 disks 1 (5%), and so on and so on...
at the end of the day, it's a performance question, if you have to handle a raid 5 without a HW-controller and without HW-cache the performance is extremely bad and it costs CPU power...

i would also recommend you to use a 1+0, but it belongs to you. do you want to spend more money, speed it up and get a better availability... or save money and get more space on performance costs...

regards PRESSY

pressy

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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