> Given the odd sizes of your drives, there might not
> be one, unless you
> are willing to sacrifice capacity.

I think for the SoHo and home user scenarios, I think it might be of advantage 
if the disk drivers offer unified APIs to read out and interpret disk drive 
diagnostics, like SMART on ATA and whatever there's for SCSI/SAS, so that ZFS 
can react on it. Be it automatically invoking spare discs or showing warnings 
in the pool status.

Or even automatically evacuating the device (given that ZFS will support it at 
some point) depending on the severity, should there be enough space on the 
other disks. For instance going top to bottom through the filesystems by 
importance, which would however an importance attribute.

-mg
 
 
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