[MlMt] High Sierra, APFS, Time Machine, and MailMate...
charlie-lists at garrison.com.au
Sun Dec 10 21:31:43 EST 2017
On 11 Dec 2017, at 13:14, Steven M. Bellovin wrote:
> Seems like an improbable subject line--but is anyone else who uses
> MailMate on High Sierra/APFS suddenly having serious Time Machine
> performance issues? I am, on two different laptops. An iMac, which has
> a hard drive and hence HFS+, is not having any trouble.
Time Machine is working normally for me.
You didn’t see what your Time Machine destination is. That would be my
> The overall symptom is that backups take *many hours*, with sudden,
> inexplicable stalls. I say "inexplicable" because Activity Monitor
> shows essentially no CPU, network, or disk activity -- but the backup
> just *stops*. I normally don't run MailMate on one of the laptops; its
> backups complete in a rational amount of time. When I do, it sees the
> same stalls. In fact, I'm running MailMate on it right now so that I
> can see what happens on my primary laptop when I exit MailMate. Sure
> enough, that machine is now behaving.
Note, TimeMachine takes a snapshot when backing up APFS volumes, so
there “shouldn’t” be any difference with MailMate running or not.
I suspect that’s really a symptom of what the real problem is.
> My suspicion is that the problem has to do with very large directories
> on APFS file systems, but I don't know that for sure. I have some very
> large mailboxes, though, and these are of course active when MailMate
> is running. And of course, that doesn't explain why I don't see any
> system activity.
Due to the way APFS works, I’d be surprised if that’s the issue.
> Is anyone else seeing this? Does anyone have any work-arounds, other
> than "don't have such large mailboxes" or "don't run APFS"? I do have
> a new laptop on order; I'm seriously tempted to reformat it as HFS+
> before I start using it.
If that new laptop has an SSD, then APFS is your only choice.
Charlie Garrison <charlie at garrison.com.au>
Garrison Computer Services <http://www.garrison.com.au>
PO Box 380
Tumbarumba NSW 2653 Australia
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