<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">that certainly an interesting point!! yeah, 3ware rock.. :-)<br><br>--- On <b>Tue, 23/6/09, Andy Smith <i><andy@strugglers.net></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Andy Smith <andy@strugglers.net><br>Subject: Re: [dundee] ELF yourself encryption<br>To: dundee@lists.lug.org.uk<br>Date: Tuesday, 23 June, 2009, 6:18 AM<br><br><div class="plainMail">Hi Lee,<br><br>On Fri, Jun 19, 2009 at 04:16:42PM +0000, Lee Hughes wrote:<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>Something I have found is that under moderate write load, the verify<br>cron job that comes with mdadm can take days to complete and<br>performance is impacted whilst doing so.<br><br>On the other hand, a "verify" task on my 3ware controllers with the<br>same disks and RAID-10 layout completes in around 12 hours on the<br>slowest setting and is not noticeable.<br><br>I suspect that this is because with software RAID all the data from<br>the disks must go across the PCIe bus and through the kernel to be<br>checked, whereas the 3ware card itself does the verify involving<br>only the disks and bus.<br><br>So, I'm having to use fairly cheap hardware RAID (3ware) on most of<br>my servers, but am still happy with Linux md RAID for home machines.<br><br>Cheers,<br>Andy<br><br>-- <br><a href="http://bitfolk.com/" target="_blank">http://bitfolk.com/</a> -- No-nonsense VPS hosting<br><br>"[Open Source is] like trying to sell human rights to China
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