[dundee] ELF yourself encryption

[Lee Hughes]

with software raid 1, I guess data loss during power fail would be no
more serious then just pulling the plug on a normal non-raided disk.

a raid controller is just more stuff to go wrong in my opinion,  when 
servers were single core affairs, the offloading raid function to a piece
of hardware made sense. The less hardware you have in a box the better,
perfect design is not when you can add stuff, it's when you can't take
anything more away.



--- On Fri, 19/6/09, Andrew Clayton <andrew at digital-domain.net> wrote:

From: Andrew Clayton <andrew at digital-domain.net>
Subject: Re: [dundee] ELF yourself encryption
To: dundee at lists.lug.org.uk
Date: Friday, 19 June, 2009, 5:06 PM

On Fri, 19 Jun 2009 16:13:12 +0100 (BST), lug at seany.us wrote:

> I totally agree, software raid is so flexible. I too was stung by the
> failed controller meaning dataloss.
> 
> Linux md raid 1 has about 1% CPU overhead and you can manage it
> directly via the commandline (no messing around with stupid BIOS
> screens). With CPU speeds these days software raid can easily compete
> with hardware raid.
> 
> Hardware raid is only really nessesary if you are running something
> other than RAID1, such as RAID5.

Well, software RAID 5 is OK. Got a 2.3TB software RAID 5 here utilizing
8 disks, (2 are hot spares). CPU's are fast and multiple ;)

Then there's the Intel I/OAT stuff for offloading some of the RAID
operations..

Personally I would never use hardware RAID given the choice.
 
> Of course with most hardware raid solutions you do have the benefit
> of battery backup on the cache at least.

I'm pretty sure that the 3Ware card we've git, if it had a battery,
that would work fine even though the disks are configured as a JBOD.
The machine is on a UPS of course.
 

Andrew

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