filesystem size in RAID 5

Michael E Brown michael_e_brown at
Thu Nov 7 11:01:00 CST 2002

On Wed, 6 Nov 2002, Alexander Lazarevich wrote:

> 2) concerning the RAID 5 array, the max ext3 filesystem size i can make on
> it is 469GB, when the actual "disk" size should be 512GB (73GB X 4). is

73GB disks aren't really 73GB. They are more like (IIRC) 67GB. Check the 
fine print next to the (*) on the spec sheet :-(

73GB x 7 disks == 511GB
67GB x 7 disks == 476GB

FYI, drive manufacturers use 1GB == 1,000,000,000 bytes. The OS uses 1GB 
== 1073741824 bytes, which leads to this discrepancy.

> this normal, or am i hitting some limit in linux? im assuming its normal,
> maybe the journal is taking up a lot of space, but i just want to make
> sure.

Looks about right to me.

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