FileVault in High Sierra - questions

Discussion in 'macOS High Sierra (10.13)' started by SkyLinx, Apr 13, 2018.

  1. SkyLinx macrumors member

    SkyLinx

    Joined:
    Mar 24, 2018
    Location:
    Espoo, Finland
    #1
    Yesterday night I enabled FileVault in my iMac (2017), and it's still encrypting. Earlier it said it would take more than one day to finish, now it's saying 15-16 hours. diskutil in the terminal says it's at 66%...

    Questions:

    - is it normal that it is taking this long with High Sierra also on a very recent Mac?
    - the startup disk is a Fusion Drive. Does FileVault in HS affect in any way how Fusion Drive works / organises automatically data between the SSD and the hard drive?
    - does the Core i5 in the iMac have hardware support for the encryption used by FileVault? if yes, does FileVault in High Sierra affect performance anyway once the initial encryption is complete or isn't it noticeable these days with latest OS and hardware?

    Thanks!
     
  2. Kingcr macrumors member

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    UK
    #2
    If you open activity monitor to show disk activity and leave it there without any keyboard or mouse activity, you may notice that the disk write activity drops off quite dramatically after exactly 5 minutes. If you’re experiencing this, you’ll either need to keep providing input every 5 minutes or use a mouse jiggler program to keep FV going at full speed.
     
  3. ignatius345, Apr 13, 2018
    Last edited: Apr 13, 2018

    ignatius345 macrumors 68000

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    #3
    Whatever you do, do NOT right-click and choose "encrypt" on an external drive unless you want it reformatted to APFS. High Sierra will (without telling you) reformat it to APFS and therefore it will no longer be Time Machine compatible. I know you didn't ask about this, but I got bit by this bug recently and nuked many months of backups.

    more here:

    https://bombich.com/blog/2017/09/29/think-twice-before-encrypting-your-hfs-volumes-on-high-sierra

    https://www.macworld.com/article/32...hine-drive-using-apfs-and-thats-not-good.html
     
  4. Kingcr macrumors member

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    #4
    OP already mentioned he has a fusion drive so this does not apply here.
     
  5. SkyLinx thread starter macrumors member

    SkyLinx

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    #5
    Uhm not sure I see any particular difference. Why would it be slower in idle? Shouldn't it be the opposite?

    Oh OK. Note taken. At the moment my Time Machine USB drive is formatted as HFS+ and TM backups are not encrypted. If I enable "Encrypt backups" in the TM options will this also convert the drive to APFS? Or will just do encryption at file level rather than at file system level?
     
  6. Kingcr macrumors member

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    #6
  7. SkyLinx thread starter macrumors member

    SkyLinx

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    #7
  8. donawalt macrumors regular

    donawalt

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    Sep 10, 2015
    #8
    Given this I wish I could remember how I encrypted my Time Machine backup, as it's been awhile. But I am on High Sierra 10.13.4, and my encrypted non-APFS drive works fine on Time Machine:

    Screen Shot 2018-04-13 at 3.43.08 PM.png
     
  9. ignatius345, Apr 13, 2018
    Last edited: Apr 13, 2018

    ignatius345 macrumors 68000

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    #9
    Yeah, encrypted is fine for Time Machine, but APFS is not. I'm assuming you must have encrypted it either using another method and/or before High Sierra.

    I'm not 100% sure exactly which methods trigger the silent APFS reformat, but I know right-clicking the drive itself sure does because I hosed my own drive that way :/
     
  10. ignatius345, Apr 13, 2018
    Last edited: Apr 13, 2018

    ignatius345 macrumors 68000

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    Aug 20, 2015
    #10
    Yeah, obviously it doesn't apply to Fusion drives, but it is relevant to the subject of drive encryption under High Sierra.

    I also wrote "I know you didn't ask about this" indicating that it was just a friendly heads-up... so maybe chill?
     
  11. SkyLinx thread starter macrumors member

    SkyLinx

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    Location:
    Espoo, Finland
    #11
    Do you know what? I have been watching the progress and I can actually confirm that while I use the iMac FV encryption is indeed faster! For example from 10 am until 4.30 pm it had progressed only by a ridiculous 1% to 84%, then I started to use the computer and now, less than half an hour later, it jumped to 87% already, so it's indeed progressing more quickly at the moment. Sys Prefs now estimates "2 hours remaining" instead of "more than one day" (I know that estimation isn't accurate at all but still...)

    This must definitely be some sort of bug because it should be the opposite. Uhm
     

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