how do you keep imac from going to sleep during disk utility backup ?

Question

Level 1

11 points

how do you keep imac from going to sleep during disk utility backup ?

using the install DVD I am attempting to create a disk image backup with the Disk Utility app. However the imac goes to slepp every 10 minutes. eventually causing an error.

I found the commands to use on the commandline in terminal, However I can not use terminal and Disk Utility app at the same time from the install DVD.

I am using moutian lion install usb drive.

The Snow Leopard install DVD could not handle the 3 TB enternal harddive where the backup will be placed, before I do a clean install of Mountain Lion.

iMac, iOS 6.1.3

Posted on Jun 24, 2013 4:40 PM

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Answer 1

Oct 12, 2013 12:17 PM in response to Samurai2k

this seems to be an issue in (mountain lion?) disk util - actually the second bug that I know of now.

I am having the same issue whilst using zeroDIsk - however the system going to standy seems to slow the task down, it hasn't failed yet.

From what I can see caffeinate will solve the issue (in mountain lion)

https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/ man8/caffeinate.8.html

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Answer 2

baltwo

Level 9

62,386 points

Oct 12, 2013 1:07 PM in response to Samurai2k

System Preferences->Energy Saver->ensure all sleep modes are disabled, then ensure that all software on the ext HD has been removed and that you formatted it correctly, See http://help.bombich.com/kb/overview/preparing-your-backup-disk-for-a-backup-of-m ac-os-x for a simple guide on how it should be prepared for a backup/clone. BTW, you can get a 30-day trial version of CCC, which might work better than Disk Utility, since DU requires making a block-level backup.

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Answer 3

Oct 15, 2013 7:56 AM in response to baltwo

Im not sure as to the OP intention, and your response may be correct - for clarity on my response, I was in recovery mode (without an OS installed yet actually) and therefore the Energy Saver options aren't applicable, in this situation, caffeinate was the answer.

I stumbled on this discussion when looking for my own issue, so thought id post the solution i found

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