Moving a server over to a RAID

[Calcpage]

On Aug 24, 2010, at 9:40 AM, "Mike A. Leonetti"  
<mikealeonetti at gmail.com> wrote:

> (2010年08月22日 09:14), Luis Paulo wrote:
>> On Sat, Aug 21, 2010 at 9:07 PM, Mike A. Leonetti
>> <mikealeonetti at gmail.com> wrote:
>>> (2010年08月21日 15:27), Luis Paulo wrote:
>> <snip>
>>>> Let me just add that, with your new setup, you may create just one
>>>> swap device (say /dev/md0) with /dev/sda2 and /dev/sdb2 in a mdadm
>>>> raid0 array. Not that important as most systems rarely use it :)
>>>>
>>> Thanks mon. I think I read somewhere if you use the options
>>> defaults,pri=1 for each swap you don't have to RAID them because the
>>> kernel will automatically balance them or something like that.
>> As you know, a raid0 swap will make disk access to swap faster, that
>> was my idea.
>>
>> But as James said, if you want to be sure your server will keep
>> running in a disk failure event, you should put the swap also in a
>> raid1, right.
>>
>> On my server I just want to be able to restore it easy and fast, so I
>> use raid1, but I put swap, /tmp and most of /var on raid0. (A disk
>> failure is a disk failure, is a disk failure, is a ... :)
>>
>> BTW, a question to all, if you have a full raid1 (or 5) system, how  
>> do
>> you know a disk has failed? I know you configure a mail address on
>> mdadm.conf that reports it, ok, but you won't know it until you have
>> read the mail. Do any of you have a way to get informed more "on the
>> spot"?
>> (Somehow this seems a stupid question, don't really know why)
>>
>> Thanks
>> Luis
>>
> What I do is I have nagios monitor all servers with RAID monitored by
> nagios by having NRPE and send e-mail alerts when /proc/mdstat reports
> that a device is down (or shown as _ and not U).  The script I found
> online was a Perl script that I can't seem to find anymore but that
> really helps keep everything monitored.  Since nagios will keep  
> polling
> and depending on your settings keep sending alert e-mails you will
> likely get the e-mail and be

Wow, is setting up RAID really that complicated?  I set up a new  
server a few months ago and remember setting up RAID via the BIOS  
menu.  I only have 4x72GB drives but they are all recognized as one  
big drive....

A. Jorge Garcia
Applied Math & CS
Baldwin SHS & Nassau CC
http://shadowfaxrant.blogspot.com
http://www.youtube.com/calcpage2009
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