disk 0 confiuraton

i'm new to this...  what is the purpose of the disk 0 configuration raid controller. ?
It has nothing to with RAID. RAID's configured on the JBOD. I'm confused. Help.
babylon2008Asked:
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triceiceCommented:
RAID is 0 is for the best performance when data redundancy is not a priority.

Here is a basic RAID guide.
http://www.nthelp.com/raidlev.htm

There is no such thing as RAID JBOD. JBOD means that you have just a bunch of independant disks.
rsimseeCommented:
Your question doesn't really make sense, but you may be talking about how a raid controller will present the first lun, usually called the boot drive.  Basically, some cheaper RAID controllers don't allow you to manually set up luns with as much control as others do, so to compensate for that they give you an option to specify the maximum size of the boot drive (which would be presented as Drive 0).

This is for 2 reasons (at least), 1, you might want to have a smaller boot drive for the OS to sit on and then have a big data drive.  But also, and this is important with big drives like you have today, If you make a RAID set larger than 2TB you won't be able to boot off of it unless you have hardware and software that supports booting from a GPT partition...

So, maybe that's what you were asking, if so, there ya go!

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babylon2008Author Commented:
hi triceice,

is there any other Disk 0 conguration for the point of OS, not for RAID
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netballiCommented:
Hello,

Let us get an overview of JBOD to understand this better.

"Just A Bunch Of Disks" (JBOD)

If you have some disks in a system that you decide not to configure into a RAID array, what do you do with them? Traditionally, they are left to act as independent drive volumes within the system, and that's how many people in fact use two, three or more drives in a PC. In some applications, however, it is desirable to be able to use all these disks as if they were one single volume. The proper term for this is spanning, clearly chosen to contrast against "redundant array of inexpensive disks", is Just A Bunch Of Disks or JBOD. How frightfully clever.

JBOD isn't really RAID at all, JBOD can be thought of as the opposite of partitioning: while partitioning chops single drives up into smaller logical volumes, JBOD combines drives into larger logical volumes. It provides no fault tolerance, nor does it provide any improvements in performance compared to the independent use of its constituent drives.

When you look at it, JBOD doesn't really have a lot to recommend it. It still requires a controller card or software driver, which means that almost any system that can do JBOD can also do RAID 0, and RAID 0 has significant performance advantages over JBOD. Neither provide fault tolerance. There are only two possible advantages of JBOD over RAID 0:

1.  Avoiding Drive Waste: If you have a number of odd-sized drives, JBOD will let you combine them into a single unit without loss of any capacity; a 10 GB drive and 30 GB would combine to make a 40 GB JBOD volume but only a 20 GB RAID 0 array. This may be an issue for those expanding an existing system, though with drives so cheap these days it's a relatively small advantage.

2.  Easier Disaster Recovery: If a disk in a RAID 0 volume dies, the data on every disk in the array is essentially destroyed because all the files are striped; if a drive in a JBOD set dies then it may be easier to recover the files on the other drives (but then again, it might not, depending on how the operating system manages the disks.) Considering that you should be doing regular backups regardless, and that even under JBOD recovery can be difficult, this too is a minor advantage.
triceiceCommented:
In Win 7 here is the way

http://www.howtogeek.com/howto/36504/how-to-create-a-software-raid-array-in-windows-7/

But this option will never be as good as any kind of Hardware RAID.
triceiceCommented:
Just reread your comment. Let start over. In plain terms: What do you want to do?
andyalderSaggar maker's framemakerCommented:
Ditto, what the heck is a "Disk 0 conguration" (or even a Disk 0 configuration)?
DavidPresidentCommented:
Really, doesn't matter what you want to do. I can't ever recommend RAID0 for any home PC except in one situation.  The performance gain is limited to large-block sequential I/O, and unless the purpose of the machine is a dedicated home theatre system, where you don't mind if everything gets lost, then it is just a waste of money that doubles the chance of total data loss (since losing one disk means losing all the data on both disks)

If you have win7 then that supports software RAID1. This does read balancing, so in perfect world, each disk does half the I/O.  Under reads, you'll get better performance then if you had a single drive, no matter what you are doing, plus it protects you against data loss in event you get a bad block or a disk fails.  On writes, you are no worse off then if you just had one disk.  

Too many people think RAID0 is the answer to performance problems.  Real-world, it often creates more problems.  
 
DavidPresidentCommented:
P.S. Even if it is a media server, a single HDD is often good enough unless you have several HD streams working at once.
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