I bought a USB power monitor dongle and plugged it in. The drives decided they 
would work on the Z840. zpool import reported the drive correctly. Draws the 
same current as when plugged in the Z400s.

I'm running a scrub, but when that finishes I'll test it without the power 
monitor dongle.

Very perplexed as that was hours of different tests.

Reg

     On Thursday, January 23, 2025 at 07:30:15 PM CST, Joshua M. Clulow 
<j...@sysmgr.org> wrote:  
 
 On Thu, 23 Jan 2025 at 17:21, Reginald Beardsley <pulask...@yahoo.com> wrote:
> Y) 4 TB WD u8 ZFS USB HD
> C does not even see Y via USB
> That's as simply as I can state it. I'll do a port by port test of all 3 with 
> Z as soon as all the scrubs finish.

Thanks, that's helpful.  What form factor is the 4TB drive?  Is it
powered by the USB port, or does it also have an external power pack?
If there aren't any log messages showing up at all when you plug Y
into C, it could potentially be a port power supply issue.


Cheers.

-- 
Joshua M. Clulow
http://blog.sysmgr.org
  
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