[ale] backup/restore mail from USB external drive

[Brian Mathis]

On Thu, Feb 13, 2014 at 10:38 AM, John Heim <john at johnheim.com> wrote:

> On 02/12/14 17:37, Jeff Hubbs wrote:
>
>> On 2/12/14, 5:00 PM, Lightner, Jeff wrote:
>>
>>> <snip>
>>>
>>> You really should be using RAID6 or RAID10 rather than RAID5 as it is
>>> even more redundant (i.e. can survive 2 disks failures).
>>>
>>>  And you shouldn't be using RAID5 or RAID6 at all if your drives are
>> 750-1000GB or larger.
>> >>>>>
>>
>
> Our disks are 600Gb.
>
> Is there any advantage to using the PERC to create 2 virtual disks from
> the RAID array? Or should I partition it in the OS? Right now, the PERC is
> configured with one virtual disk for the operating system and another for
> the mail. But I could make one big virtual disk out of  the 5 physical
> disks which would show up as a 2Tb /dev/sda. Then I could use the installer
> to partition it.
> to partition it.
>


Do you currently have disks fully dedicated to each virtual disk, or are
you using a slice of each disk to make them?  If you're dedicating full
disks, I'd switch to using 1 big RAID, then partition it and use LVM for
flexibility.  You might want to think about sacrificing some space and go
to RAID6 or RAID10 if you can.  With a RAID10 you'd get about 1.2TB of
space, a hot spare, and a performance increase.


❧ Brian Mathis
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