[MlMt] . Re: High Sierra, APFS, Time Machine, and MailMate.
tracy at dlsi.biz
Thu Dec 14 12:44:04 EST 2017
As an Apple Developer since 1978, I can say that I quit using TM years
ago. It is a consumer-level product, with modest capabilities and
You asked for a solution. You need more robust backup software, which
offers a mimicking of TM.
Two extremely reliable options are Carbon Copy Cloner and Chronosync.
Both can be configured to run automatically whenever you like.
Chronosync is extremely versatile, and can out-do TM in its level of
On 14 Dec 2017, at 9:00, mailmate-request at lists.freron.com wrote:
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> 1. Re: High Sierra, APFS, Time Machine, and MailMate... (Roger
> Message: 1
> Date: Wed, 13 Dec 2017 09:45:44 -0800
> From: "Roger Bohn" <Rbohn at ucsd.edu>
> To: "MailMate Users" <mailmate at lists.freron.com>
> Subject: Re: [MlMt] High Sierra, APFS, Time Machine, and MailMate...
> Message-ID: <4355C63B-7270-4D4A-B4B8-B45D276873E0 at ucsd.edu>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> I have had this situation for many YEARS, long before I got MailMate.
> 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*.
> The problem is worse, the more Time Machine needs to back up. And for
> reasons I have never figured out, even a routine backup on TM (of a
> hours of material) can have 5GB of files to go through. As a result, I
> can get into a situation where TM is completely unable to get up to
> So I don’t know a solution, but don’t be too sure that it is
> due to MM. If anyone finds a solution, please drop me a line!
> One thing that helps is to switch from WiFi to a hard ethernet
> connection. For some reason, TM is considerably faster that way.
> Roger Bohn, UC San Diego
> Rbohn at ucsd.edu
> On 10 Dec 2017, at 18:14, 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
>> a hard drive and hence HFS+, is not having any trouble.
>> 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;
>> 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.
>> My suspicion is that the problem has to do with very large
>> on APFS file systems, but I don't know that for sure. I have some
>> 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.
>> 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.
>> --Steve Bellovin, https://www.cs.columbia.edu/~smb
>> mailmate mailing list
>> mailmate at lists.freron.com
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