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____/ Subway steel on Wednesday 16 July 2008 16:37 : \____
> "Roy Schestowitz" <newsgroups@xxxxxxxxxxxxxxx> wrote in message
> news:1437739.8h3juO2iW9@xxxxxxxxxxxxxxxxxx
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>> Benchmarking hardware RAID vs. Linux kernel software RAID
>>
>> ,----[ Quote ]
>> | My tests showed that the choice of filesystem makes a huge impact on
>> | performance, with XFS being substantially quicker for output on parity
>> RAIDs,
>> | though in some configurations, such as 256KB-chunk RAID-10 block input,
>> XFS
>> | can be slower than ext3.
>> `----
>>
>> http://www.linux.com/feature/140734
>
> It basically sounds like "hardware" RAID wins doesn't it?
>
> For RAID-10 using a smaller block size such as 256KB you get a noticeable
> difference between hardware and software in rewrite performance. Hardware
> beats out software substantially in output for parity RAID, with hardware
> being 66% faster for block output and 20% faster for rewrite performance in
> a 256KB chunk RAID-6. Therefore if you want performance and the capability
> to sustain multiple drive failure at the same time you should investigate
> hardware RAID solutions. Aside from the benchmarks, the hardware RAID card
> also supports hot-plug replacement, mitigating downtime to swap out dead
> drives. Based on these test results you might consider buying some cheaper
> SATA ports and stripe two software RAID-6 arrays instead of buying a
> hardware RAID card with the same budget.
>
>
>
> The problem with software RAID is that if there's a massive software failure
> then you can't rely on the disks remaining intact. Aside from hot swapping
> and better performance, hardware solutions are generally more reliable
> because they provide an extra layer of isolation from the OS.
Automated nightly (and remote) backups work well too. Separate software,
hardware, venue. I know that WordPress pondered mysql dumps every few minutes
or so at the time it was first set up. I don't know how they handle it at the
moment. They have experiment with a variety of things. Oh, and ma.tt's blog
got hijacked too at one stage, so he learned his lesson. Weak password.
- --
~~ Best of wishes
Roy S. Schestowitz | "All your archives are (sic) belong to Google"
http://Schestowitz.com | GNU is Not UNIX | PGP-Key: 0x74572E8E
http://iuron.com - proposing a non-profit search engine
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