Functioning of --backup-file prior to array growth.

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Greetings,

I didn't want to hijack Kevin's "Damage when growing RAID 5 array" thread, but this got me thinking about my past experiences.

I'm preparing to add a disk to an existing RAID6.

In the past (more than one occasion) I've specified: "--backup-file=/disk/not/part/of/array/md.bak" and then, after starting the growth, I've gone to this path, and seen nothing created.

Is this a file that is created *only* in the event of an error / failure? Should some data be written to this .bak file immediately? If not, what could be preventing this file from being created?

Thanks for your input.

-EJ
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