<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">with software raid 1, I guess data loss during power fail would be no<br>more serious then just pulling the plug on a normal non-raided disk.<br><br>a raid controller is just more stuff to go wrong in my opinion, when <br>servers were single core affairs, the offloading raid function to a piece<br>of hardware made sense. The less hardware you have in a box the better,<br>perfect design is not when you can add stuff, it's when you can't take<br>anything more away.<br><br><br><br>--- On <b>Fri, 19/6/09, Andrew Clayton <i><andrew@digital-domain.net></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Andrew Clayton <andrew@digital-domain.net><br>Subject: Re: [dundee] ELF yourself encryption<br>To: dundee@lists.lug.org.uk<br>Date: Friday, 19 June, 2009, 5:06 PM<br><br><div
class="plainMail">On Fri, 19 Jun 2009 16:13:12 +0100 (BST), <a ymailto="mailto:lug@seany.us" href="/mc/compose?to=lug@seany.us">lug@seany.us</a> wrote:<br><br>> I totally agree, software raid is so flexible. I too was stung by the<br>> failed controller meaning dataloss.<br>> <br>> Linux md raid 1 has about 1% CPU overhead and you can manage it<br>> directly via the commandline (no messing around with stupid BIOS<br>> screens). With CPU speeds these days software raid can easily compete<br>> with hardware raid.<br>> <br>> Hardware raid is only really nessesary if you are running something<br>> other than RAID1, such as RAID5.<br><br>Well, software RAID 5 is OK. Got a 2.3TB software RAID 5 here utilizing<br>8 disks, (2 are hot spares). CPU's are fast and multiple ;)<br><br>Then there's the Intel I/OAT stuff for offloading some of the RAID<br>operations..<br><br>Personally I would never use hardware RAID given the choice.<br>
<br>> Of course with most hardware raid solutions you do have the benefit<br>> of battery backup on the cache at least.<br><br>I'm pretty sure that the 3Ware card we've git, if it had a battery,<br>that would work fine even though the disks are configured as a JBOD.<br>The machine is on a UPS of course.<br> <br><br>Andrew<br><br>_______________________________________________<br>dundee GNU/Linux Users Group mailing list<br><a ymailto="mailto:dundee@lists.lug.org.uk" href="/mc/compose?to=dundee@lists.lug.org.uk">dundee@lists.lug.org.uk</a> <a href="http://dundee.lug.org.uk" target="_blank">http://dundee.lug.org.uk</a><br><a href="https://mailman.lug.org.uk/mailman/listinfo/dundee" target="_blank">https://mailman.lug.org.uk/mailman/listinfo/dundee</a><br>Chat on IRC, #tlug on dundee.lug.org.uk<br></div></blockquote></td></tr></table><br>