Groups > comp.sys.mac.hardware.storage > #1567

Re: Sierra's Time Machine's backups slower?

From	Lewis <g.kreme@gmail.com.dontsendmecopies>
Newsgroups	comp.sys.mac.system, comp.sys.mac.hardware.storage
Subject	Re: Sierra's Time Machine's backups slower?
Date	2017-04-29 20:07 +0000
Organization	Miskatonic U
Message-ID	<slrnog9sqf.2suk.g.kreme@snow.local> (permalink)
References	(5 earlier) <slrnog3fea.jnv.g.kreme@snow.local> <agisaak-389227.05495427042017@88-209-239-213.giganet.hu> <5902365e$0$8033$b1db1813$2411a48f@news.astraweb.com> <slrnog69gr.lhc.g.kreme@snow.local> <5903916f$0$10144$c3e8da3$e408f015@news.astraweb.com>

Cross-posted to 2 groups.

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In message <5903916f$0$10144$c3e8da3$e408f015@news.astraweb.com> JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
> On 2017-04-28 07:19, Lewis wrote:

>> If only there were some way to tell how many links there were to a
>> file...

> Knowing there are 180 directory entries pointing to File1.txt is easy.
> And depending on the file system, if the actual file entry has
> backpointers, you may also easily find out in which directories and
> under which name these 180 entries are.

No, dummy. That's absurd.

> So if you wish to delete all references to file1.txt, you can do it by
> finding all references to it and deleting it.  That will free up the
> disk space occupied by file1.txt. But also make 180 backups corrupt
> since they will be incomplete.

Taht seems like something you would think of; it's not something any
competent person would ever think of doing.

> When Time Machine needs free space, it does not and cannot decide to
> make a whole buchh of backsups corrupt by arbritrarily deleteing one or
> two files of its choice. It needs to eliminate full backups from oldest
> to newest backups until enough space has been freed.

No one said anything about corrupting backups. You are being
astonishingly dumb.

> And this is where it can get very IO intensive

No. Not at all.

> if deleting the oldest backup merely results in a whole buch of
> directory updates to remove fiule entries without freeing any space
> because these files are all used by subsequent backups.

Time Machine knows how may files have a single link, so knows how much
space deleting a backup snapshot will free. Duh.

> If your TM backup is on USB, I doubt it would impact SATA drives or PICe
> SSDs since they use different interconnects.

Your complete lack of understanding on how modern computer systems work
and modern hardware specifications is a constant source of amusement.
Deleting files from drives is very fast because the OS has to do very
little; the drive does nearly all the work.

-- 
SOME SHADOWS ARE SO LONG, THEY ARRIVE BEFORE THE LIGHT. --Soul Music

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Thread

Sierra's Time Machine's backups slower? ANTant@zimage.com (Ant) - 2017-04-25 13:16 -0500
  Re: Sierra's Time Machine's backups slower? nospam <nospam@nospam.invalid> - 2017-04-25 14:17 -0400
    Re: Sierra's Time Machine's backups slower? Snit <usenet@gallopinginsanity.com> - 2017-04-25 13:19 -0700
  Re: Sierra's Time Machine's backups slower? "Andre G. Isaak" <agisaak@gm.invalid> - 2017-04-25 22:20 -0600
    Re: Sierra's Time Machine's backups slower? dempson@actrix.gen.nz (David Empson) - 2017-04-26 19:38 +1200
      Re: Sierra's Time Machine's backups slower? "Andre G. Isaak" <agisaak@gm.invalid> - 2017-04-26 07:56 -0600
        Re: Sierra's Time Machine's backups slower? nj_kruse@me.com (Niels Jørgen Kruse) - 2017-04-26 20:44 +0200
          Re: Sierra's Time Machine's backups slower? "Andre G. Isaak" <agisaak@gm.invalid> - 2017-04-26 13:03 -0600
            Re: Sierra's Time Machine's backups slower? nj_kruse@me.com (Niels Jørgen Kruse) - 2017-04-26 22:13 +0200
          Re: Sierra's Time Machine's backups slower? nospam <nospam@nospam.invalid> - 2017-04-26 16:45 -0400
            Re: Sierra's Time Machine's backups slower? android <here@there.was> - 2017-04-27 06:37 +0200
              Re: Sierra's Time Machine's backups slower? nospam <nospam@nospam.invalid> - 2017-04-27 00:39 -0400
                Re: Sierra's Time Machine's backups slower? android <here@there.was> - 2017-04-27 06:44 +0200
                Re: Sierra's Time Machine's backups slower? Alan Baker <alangbaker@telus.net> - 2017-04-26 21:57 -0700
                Re: Sierra's Time Machine's backups slower? android <here@there.was> - 2017-04-27 07:08 +0200
                Re: Sierra's Time Machine's backups slower? Alan Baker <alangbaker@telus.net> - 2017-04-26 22:10 -0700
                Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-27 09:43 +0000
                Re: Sierra's Time Machine's backups slower? nospam <nospam@nospam.invalid> - 2017-04-27 09:28 -0400
                Re: Sierra's Time Machine's backups slower? Alan Baker <alangbaker@telus.net> - 2017-04-27 07:02 -0700
                Re: Sierra's Time Machine's backups slower? Bruce Esquibel <bje@ripco.com> - 2017-04-28 11:13 +0000
                Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-28 11:25 +0000
                Re: Sierra's Time Machine's backups slower? nospam <nospam@nospam.invalid> - 2017-04-28 08:09 -0400
                Re: Sierra's Time Machine's backups slower? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2017-04-28 14:42 -0400
                Re: Sierra's Time Machine's backups slower? dempson@actrix.gen.nz (David Empson) - 2017-04-29 09:01 +1200
                Re: Sierra's Time Machine's backups slower? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2017-04-28 22:59 -0400
                Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-29 20:10 +0000
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-27 16:41 +0000
                Re: Sierra's Time Machine's backups slower? android <here@there.was> - 2017-04-27 20:32 +0200
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-27 23:23 +0000
                Re: Sierra's Time Machine's backups slower? android <here@there.was> - 2017-04-28 05:40 +0200
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-28 16:14 +0000
                Re: Sierra's Time Machine's backups slower? android <here@there.was> - 2017-04-28 18:40 +0200
          Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-27 09:42 +0000
            Re: Sierra's Time Machine's backups slower? "Andre G. Isaak" <agisaak@gm.invalid> - 2017-04-27 05:49 -0600
              Re: Sierra's Time Machine's backups slower? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2017-04-27 14:20 -0400
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-27 18:31 +0000
                Re: Sierra's Time Machine's backups slower? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2017-04-27 14:56 -0400
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-27 19:32 +0000
                Re: Sierra's Time Machine's backups slower? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2017-04-27 15:55 -0400
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-27 20:41 +0000
                Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-28 11:19 +0000
                Re: Sierra's Time Machine's backups slower? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2017-04-28 15:01 -0400
                Re: Sierra's Time Machine's backups slower? Jolly Roger <jollyroger@pobox.com> - 2017-04-28 19:06 +0000
                Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-29 20:07 +0000
              Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-28 11:16 +0000
  Re: Sierra's Time Machine's backups slower? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-04-26 14:00 +0000

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