dmraid works. now what?
Ben Morse
ben at genplan.com
Wed May 18 15:15:51 UTC 2005
Dmraid IS software raid (Sorta). Some people call it "fakeraid", which
is basically a mix between hardware and software raid. I'm glad to hear
that dmraid works just fine for you. You don't even need to use lvm,
b/c dmraid does that all for you. All you need to do, is install on one
of the partitons in /dev/mapper. This is easier said than done however
(Depending on which distro you want to use)
-ben
striker wrote:
>Please forgive my ignorance. I'll provide any info required. Here's my
>situation.
>
>I've been running a windows box with a promise fastrak controller. It's
>got two disks in a striped configuration.
>
>I recently installed an indepented 3rd disk, used it to install FC3, and
>set up dmraid. dmraid recognized my raid and the entries in /dev/mapper
>exist:
>
>crw------- 1 root root 10, 63 Apr 29 00:19 control
>brw-r----- 1 root root 253, 0 May 18 12:41 pdc_djbcgacc
>brw-r----- 1 root root 253, 1 May 18 12:41 pdc_djbcgacc1
>brw-r----- 1 root root 253, 2 May 18 12:41 pdc_djbcgacc5
>
>The total disk space on the raid is 120 GB. I haven't allocated it all.
>I want to use the unused space to create a linux "partition". This is
>where I start to flounder. I don't have any experience configuring
>software raid on Linux.
>
>It seems like I should use LVM2 somehow except that I'm not sure how to do
>so without destroying what I've already got on the disks. Here's the
>output of lvmdiskscan:
>
> /dev/hda [ 3.74 GB]
> /dev/hde [ 57.25 GB]
> /dev/hdg [ 57.25 GB]
> /dev/hda1 [ 2.73 GB]
> /dev/hde1 [ 4.89 GB]
> /dev/hda2 [ 1019.75 MB]
> /dev/hde2 [ 1.00 KB]
> 3 disks
> 4 partitions
> 0 LVM physical volume whole disks
> 0 LVM physical volumes
>
>What's my next step here? Please talk to me like I am 3 years old.
>
>Thanks in advance.
>
>
>
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