Re: Software RAID in Woody --- General Issues
hi ya lucas
my raid tests...
- pull the cable to the disk ...
it should still boot and keep merrily working in degraded mode
add a new file or two
- put the cables back in and see if it resyncs the new file
still not in the other "simulated dead disk"
- reverse the disk failures and it should still keep working
- for /boot
- its only needed in old bios that had a 1024 cylinder problem
- i tend to always use /dev/hda1 128MB or 256MB
( first partiton for rootfs ) and have never had a /boot problem..
- for /bin /boot /etc /dev /lib /sbin ( root=fs )
- keep that all mirrored too or not
( if its mirrored, its harder to build )
- if the default linux system itself is NOT raided,
than its 5 minutes to rebuild a new linux system ??
( usually faster than rebuilding a new raid system )
- ie how much down time can you hve if you have to rebuild
it again from backups
- for /var /usr -- keep that mirrored tooif the rootfs is mirrored
- for /home .. definitely mirror ( raid1 ) that ??
( the whole point of it ) ??
- even if data is mirrored, be sure to have other non-raid backup
mechanisms
- more (software) raid tidbits - commands too
http://www.1U-Raid5.net/
- assuming you're doing an IDE based raid ...
==
== for the disks... dont bother with ibm disk deskstar drives for raid
== or any other use, its a major headache ... it will die faster than
== you expect
==
c ya
alvin
On Wed, 23 Oct 2002, Lucas Barbuto wrote:
> Hi List,
>
> I'm looking at installing Software RAID on two new servers at work (one
> web and one db server). I'm really only interested in RAID-1 for it's
> redundancy, I'm not particularily concerned about performance. I've
> gone through the Software RAID HOWTO and it seemed fairly straight
> forward, however, I haven't managed to get things working and I have a
> couple of questions and problems:
>
> 1) Question: Is it important to have my boot partition (also my
> root partition, I don't have a seperate /boot) as part of an array? If
> I want this array for redundancy, I would have thought this was
> essential, but it looks like quite a difficult process. Is it worth the
> hassle of following the instructions in the HOWTO (which I find a bit
> confusing and haved managed to botch up once already)? Is there another
> option for a fully redundant system? If I just RAID my non-root
> partitions, is this still fairly safe?
>
> 2) Problem: I managed to get Software RAID working to an extent
> when I compiled all the RAID kernel components as modules (at least I
> was able to execute the 'mkraid' command to start constructing the array
> on the /home partition) but it's stopped working since I compiled
> support directly into the kernel. This could just be me doing something
> stupid, but I've checked my kernel configuration twice.
>
> Any other RAID advice anyone can offer (redundancy related) is also much
> appreciated, as I'm a bit of a RAID-newbie.
>
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