R6 won't mount to iMac or turn off with the power button

  • Last Post 18 June 2022
David Arnold posted this 04 January 2022

I have been having issues with my pegisis R6 since i had a drive failure. It was a 6TB unit that i then replaced with 6 x 4TB drives and set up in raid 6 with a hot spare. once is was all set up, it has been dropping out/ ejecting from my imac. I would have to unplug the thunderbolt lead and plug it back in again, and then after a while (60 sec maybe) it would show up again. then ofter a few minutes-hour the mac would send a warning about ejecting a disk properly as the raid droped out again.

Then this morning, i can not get it to mount or be recognised by the imac at all.

I also note that the power button appears to no be responding. pusshing it or holding it does nothing.

I am wondering if there is an internal power supply issue maybe like filter caps or something causing issues.

Imac (late 15) big sir OS.

Any tips would be great as this is used as out primary photo storage.



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Gautham Sakthi posted this 10 January 2022

Hello David,

Have you tried using a different thunderbolt cable ?

If it still does not work then check by connecting the unit without any drives inserted, open Promise Utility to verify if it see the unit.

Save a subsystem report, create a support case by going to support.promise.com and attach the report so we can check further.



David Arnold posted this 06 June 2022

Positive update at last.


Well there seems to be some very good news for Promise pegisis1 users. the latest update to Monterey version 12.4 and the disk mounting issue appears to be resolved finally.


Best of luck.


Regards, David

David Arnold posted this 18 June 2022


Well it works better now and continued until i manually put my Imac to sleep, then it has unmounted and wont remount.

If i shut down the R6, and the Mac, then restart it will remount and remain remounted until it goes to sleep, then unmounts again.


Bummer, just when i thought it was solved.