Marko Berg wrote:

Bill Davidsen wrote:

quoted

Marko Berg wrote:

quoted

I added a fourth drive to a RAID 5 array. After some complications 
related to adding a new HD controller at the same time, and thus 
changing some device names, I re-created the array and got it 
working (in the sense "nothing degraded"). But size results are 
weird. Each component partition is 320 G, does anyone have an 
explanation for the "Used Dev Size" field value below? The 960 G 
total size is as it should be, but in practice Linux reports the 
array only having 625,019,608 blocks.

I don't see that number below, what command reported this?

For instance df:

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/md0             625019608 358223356 235539408  61% /usr/pub

quoted

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How can this be, even though the array should be clean with 4 active 
devices?

df reports the size of the filesystem, mdadm reports the size of the array.

-- 
bill davidsen [off-list ref]
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979