[CentOS] 40TB File System Recommendations

Tue Apr 12 14:01:00 UTC 2011
Marian Marinov <mm at yuhu.biz>

On Tuesday 12 April 2011 16:48:14 Markus Falb wrote:
> On 12.4.2011 15:02, Marian Marinov wrote:
> > On Tuesday 12 April 2011 15:56:54
> > rainer-RNrd0m5o0MABOiyIzIsiOw at public.gmane.org wrote:
> > 
> > Yes... but with such RAID10 solution you get only half of the disk
> > space... so from 10 2TB drives you get only 10TB instead of 16TB with
> > RAID6.
> From a somewhat theoretical view, this is true for standard raid10 but
> Linux md raid10 is much more flexible as I understood it. You could do 2
> copys over 2 disks, thats like standard 10. Or you could do 2 copys over
> 2 or 3 or ... x disks. Or you could do 3 copys over 3 or 4 or ... x
> disks. Do the math. See the manpage for md(4) and
> http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10
> However, I have to admit that I have no experience with that but would
> like to hear about any disadvantages or if I am mislead. I am just
> interested.
Its like doing RAID50 or RAID60... Again the cheapest solution is RAID6. 
I really like the software raid in linux, it has good performance. But I have 
never tested it on such big volumes. And usually it is really hard to put 10 
or more drives on a machine without buying a sata controler. 


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