Re: [CentOS] mdadm size issues

Nathan Norton wrote:

Hi,

I am trying to create a 10 drive raid6 array. OS is Centos 5.3 (64 Bit)

All 10 drives are 2T in size. .... mdadm: size set to 1953511936K Continue creating array?

As you can see mdadm sets the size to 1.9T. Looking around there was this limitation on older versions of mdadm if they are the 32 bit version. I am using the 64 bit most up to date version from Centos.

a "2TB" drive is approximately 2,000,000,000,000 bytes. This is about 1.8TB if you measure a terabyte as 1024^4 the way software does.

**2 000 000 000 000 / 1024 = 1 953 125 000 Kilobytes**

**2 000 000 000 000 / 1024^2 = 1 907 348.63 Megabytes**

*2 000 000 000 000 / (1 024^3) = 1 862.645 Gigabytes*

**2 000 000 000 000 / (1 024^4) = 1.819 Terabytes **