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
first suspect.
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.
-cng
--
Charlie Garrison <[email protected]>
Garrison Computer Services <http://www.garrison.com.au>
PO Box 380
Tumbarumba NSW 2653 Australia
[Conundrum](http://www.ietf.org/rfc/rfc1855.txt)
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