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Re: issue with mdadm and mirroring drives



In related questions - i hope you can answer - are :

1. why do i get an error when trying to make swap partition - i get
this error below after running fdisk, creating a primary partition
/dev/sdd2 and then changing the type - with t -
As in below ---

2. the /dev/sdd drive is the mirrored drive in the set - do i have to
set /dev/sdd1 active in fdisk ???


root@rider:~# mkswap /dev/sdd2

mkswap: error: swap area needs to be at least 40 KiB
Usage: mkswap [-c] [-pPAGESZ] [-L label] [-U UUID] /dev/name [blocks]
root@rider:~# fdisk -l /dev/sdd


Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005d0fd


   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1      121091   972663426   fd  Linux raid autodetect
/dev/sdd2          121092      121601     4096575   82  Linux swap / Solaris


thanks
mjh



On Thu, Jan 19, 2012 at 12:44 PM, Marc Auslander <marcausl@gmail.com> wrote:
> Jon Dowland <jmtd@debian.org> writes:
>
>>
>> Pretty sure at that stage it has loaded modules that let it interpret
>> a selection of filesystem types, in order to fetch grub.cfg (and
>> further
>
> How does it decide which partition (on which disk) and what pathname
> to use to find grub.cfg.  I assume one it chooses a partition it can
> look at partitions, figure out what kind they are, and figure out how
> to read them.
>
> Also - if the chosen partition is raid1 does it "assemble" the array
> or just use the chosen partition as if it where a degraded array.
>
>
> --
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