On Thu, Sep 29, 2011 at 9:28 PM, Adam Goryachev <mailinglists AT websitemanagers.com DOT au> wrote:
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On 30/09/11 04:11, Mike Dresser wrote:
> Just finishing up moving one of my backuppc servers to new larger disks,
> and figured I'd submit a success story with backuppc_tarpccopy... I
> wanted to create a new xfs filesystem rather than my usual dd and
> xfsgrowfs, as this thing has been in use since backuppc 2.1 or similar.
> Old disks were 10 x 1TB in raid10, new is 6 x 3TB's in raid6 (which in
> itself has been upgraded many times).. the new raid6 is FAR faster in
> both iops and STR than the old one.
Hi,
I'm curious that you say you are getting better performance from the new
RAID6 compared to the old RAID10.
Can I assume this is because the new HDD's perform better than the old?
In other words, would it be safe to assume you would get even better
performance using RAID10 with the new HDD's than you are getting with RAID6?
I'm just curious, I'm fairly confident that RAID10 always performs
better than RAID5 or RAID6. Just want to make sure I'm not making a mess
of things by using RAID10 over RAID6.
Can anyone suggest any advantage of RAID6 over RAID10 (aside from the
obvious additional storage capacity/reduced wastage of space)?
Thanks,
Adam
- --
Adam Goryachev
Website Managers
www.websitemanagers.com.au
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On the RAID 6 vs RAID 10 aspect of your question, using the example from Mike, that RAID 10 array could use 1/2 of the actual storage. So 5TB usable with 10x1TB (10TB) drives, while the RAID6 array can use 12TB with 6x3TB (18TB) hard drives. At least my understanding of one of the benefits of 6 over 10 is that 6 scales better. You get the storage space of n-2 rather than n/2, so if your dealing with large numbers of disks the usable capacity penalty is much less. Be interested if that's seen as an accurate assessment and if there are other possible trade offs between the two. I've typically also favored 10 , but recently began using 6 on storage arrays where I needed large numbers of disks to have as much storage space available while still having high fault tolerance.
- Trey
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All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security
threats, fraudulent activity, and more. Splunk takes this data and makes
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________
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