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@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.
Marian