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Offlinethe man
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spanning disks, RAid?
    #7221894 - 07/25/07 11:46 AM (16 years, 7 months ago)

how do you span disks?. and is it possible to set up a raid 0 and then add more hard drives that arent In RAID in the future? thanks


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InvisibleBoom
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Re: spanning disks, RAid? [Re: the man]
    #7223224 - 07/25/07 05:30 PM (16 years, 7 months ago)

You need to go into the raid config during boot and set that up


At work we have 4 hard drives in a raid 10 array, and one backup drive that we'll be swapping out. So to add that one extra hard drive, I had to go into the raid config and add another disk group (span?), but when there's just one it really isn't a raid array, you just need to set it up under the raid controller so that the OS recognizes the fact that there is another hard drive

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Offlinethe man
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Re: spanning disks, RAid? [Re: Boom]
    #7224233 - 07/25/07 09:58 PM (16 years, 7 months ago)

its imposible to add new hard drives when stripping, no? liek in Raid 0. will any motherboard support spanning or jsut the RAids that it says it does??


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OfflineSeussA
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Re: spanning disks, RAid? [Re: the man]
    #7225124 - 07/26/07 04:58 AM (16 years, 7 months ago)

> its imposible to add new hard drives when stripping, no?

It is possible with DGUX, but that is the only OS that I have seen that can do it. The DGUX virtual disk file system rocks; you can add and remove physical disks on the fly. The OS will move all the data from one disk to another part of the file system (stored on a different disk), then reconfigure the file system tables so that the free disk is no longer part of the file system. It is very impressive.


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Offlinethe man
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Re: spanning disks, RAid? [Re: Seuss]
    #7229381 - 07/27/07 03:27 AM (16 years, 7 months ago)

is it possible to RAID 0 2 discs and then span 2 more? also how do i span discs? i can figur ehow to raid them just nto span them.


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OfflineSeussA
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Re: spanning disks, RAid? [Re: the man]
    #7229459 - 07/27/07 04:35 AM (16 years, 7 months ago)

First, when dealing with RAID, you need to change how you think of disks and disk space. Always make reference to the nature of the disk, be it physical or virtual. You create a single virtual disk out of two or more physical disks (typically).

With RAID 0, you are simply striping data across two or more physical disks to create one large virtual disk. There is no data redundancy. If one of the physical disks in the array dies, you loose the entire virtual disk.

With RAID 1, you are writing identical data to two physical disks (typically). This is known as mirroring. If you loose one disk in the array, no big deal because you have an additional copy on the second disk.

With RAID 0+1, you combine the two methods above. Lets say you have four physical disks. You can stripe A & B into one virtual drive AB, you can stripe C & D to a second virtual drive CD. You can then mirror virtual drive AB to virtual drive CD creating a new virtual drive ABCD that is both striped and mirrored.

However, RAID 0+1 isn't often used as you loose (at least) 1/2 of your total available physical disk space to redundancy. A better solution is RAID 5.

RAID 5 doesn't mirror data. Instead, it writes extra data to ensure that data can be recovered if a physical drive fails. RAID 5 stripes data across every disk in the array, and it also saves parity information across every disk in the array. If a single disk fails, the array can calculate the lost data from the remaining good physical disks and the extra parity data. With RAID 5 you loose 1/n of your total available physical disk space to redundancy (where n is the number of physical disks in your array). You can see, with 2 drives, RAID 5 behaves much like RAID 1, loosing 1/2 the disk space to redundancy. However, with 4 physical disks, RAID 5 looses only 1/4 the space rather than 1/2.


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Offlinethe man
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Re: spanning disks, RAid? [Re: Seuss]
    #7229798 - 07/27/07 09:15 AM (16 years, 7 months ago)

yes i was thinkign abotu RAID 5 but i believe my mother board only supports 1. 0 and 10 unless there is a software option.

also is it just a matter of finding software for spanning discs? i am a mac user and this PC i built is going to run soem editing software but mostly be used as a multimedia machine. so i am concerned with adding new HDs but also retriving movies and such without going through 4 discs. it will also act as a sort of media server for my other comps to access. and i know windows isnt quit up with spotlight for searching things out. thanks again gusy i appreciate the help

cheers

PS vista home prem. media center tired to play a dvd no sound?? not through HDMI to my tv or through headphone jack in the front.. its a real dvd. and can media centere play divx? or other emp4 formats.


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