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Re: El Capitan oddities

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On 10/9/15 1:25 PM, Alan Browne wrote:
> On 2015-10-09 12:38, John Somerset wrote:
>> On 10/9/15 9:38 AM, Alan Browne wrote:
>>> On 2015-10-08 22:08, John Somerset wrote:
>>>
>>>> That's it. I've never taken the plunge to automatic backups.
>>>
>>> Trivially easy.  And once set up and running, all but noticeable in
>>> operation, esp. with high speed interfaces (Firewire or faster).
>>
>> It's a carryover from System 7.  A power interruption could make a disk
>> unreadable, IIRC.  I kept my backup drive turned off normally so a power
>> problem wouldn't corrupt it along with my internal disk.  Maybe
>> journaling has made the risk negligible.
>
> Many things make it negligible.  I've had power failures during writes
> and no issues afterwards other than files that needed to be copied again.
>
> You can also get a UPS to keep your disks up during writes - further,
> they have power failure management s/w to terminate tasks on the mac
> during power failures that last more than x minutes.  (Although I don't
> know how gracefully TM exits if writing at that time.  OTOH, once a TM
> volume is initialized, hourly updates take little time).
>
A few months ago, the household lights blinked, but my Mini and 
LED-backlight monitor kept going.  I was impressed. If my Mini had been 
powering a USB drive, maybe it wouldn't have kept running.  I guess 
corrupting a backup disk would probably be an inconvenience, not a disaster.

>
>>>
>>>>
>>>> I'm scared of the trouble I might get into if I encrypted my disk.
>>>
>>> Trivially low risk and removes any "end of disk life" issues wrt
>>> destroying data.  Just make a copy of the recovery key and keep in a
>>> safe place.
>>>
>> How does encryption prevent loss of data?
>>
>> Is the recovery key normally a password created by the user?
>
> No.  It's gen'd by FileVault.  24 chars (similar to a s/w license key).
>
> Note that you would normally keep the Filevault key in your keychain
> which requires password access.  eg: when you log in to your mac, the HD
> Filevault key is retrieved via keychain.
>
>
I've found a page on Filevault.
http://osxdaily.com/2013/05/22/filevault-disk-encryption-mac/

I was worried about what a power interruption could do.  It says I'd 
have to restart the computer. If the disk needed repair, I wonder if 
that would be a problem with Filevault.

It says with a 5400 rpm drive, I might see slower performance. I guess 
I'd have to try it to find out.

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Re: El Capitan oddities xxx <xxx@yyy.zzz> - 2015-10-08 01:54 -0400
  Re: El Capitan oddities John Somerset <somerset@nospam.com> - 2015-10-08 16:29 -0400
    Re: El Capitan oddities dempson@actrix.gen.nz (David Empson) - 2015-10-09 14:09 +1300
      Re: El Capitan oddities John Somerset <somerset@nospam.com> - 2015-10-08 22:08 -0400
        Re: El Capitan oddities Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-09 09:38 -0400
          Re: El Capitan oddities John Somerset <somerset@nospam.com> - 2015-10-09 12:38 -0400
            Re: El Capitan oddities Jolly Roger <jollyroger@pobox.com> - 2015-10-09 17:08 +0000
            Re: El Capitan oddities Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-09 13:25 -0400
              Re: El Capitan oddities John Somerset <somerset@nospam.com> - 2015-10-09 22:59 -0400
                Re: El Capitan oddities Alan Browne <alan.browne@freelunchvideotron.ca> - 2015-10-10 09:48 -0400
      Re: El Capitan oddities Tim Streater <timstreater@greenbee.net> - 2015-10-09 12:30 +0100

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