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extremely slow time machine backup

4790 Views 12 Replies Latest reply: Oct 19, 2009 5:47 PM by velocity08 RSS
apurva_kansara Calculating status...
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Sep 4, 2009 11:07 PM
Hi,
I tried my first backup on snow leopard and I found it extremely slow compared to leopard. What used to take 20 minutes in leopard now takes 3 to 4 hours.

This was my first backup on snow leopard.

Is there any known issue for slow TM backup? If not, this must be a bug in this new OS.

If there is any assistance needed (i.e. logs etc) do let me know.

Thanks,
Apurva
Macbook
  • Matthew Connolly3 Calculating status...
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    Sep 5, 2009 2:36 AM (in response to apurva_kansara)
    Was this your first backup?

    When I installed SL I did a clean install and then restored all my documents from my time machine backup. The restore took about 5-6 hours.

    Unfortunately, SL didn't recognise that the backup was the same, so I then had to erase my time machine drive and start a new TM backup.

    My first TM backup (to a firewire 400 drive) took nearly 3 days to complete.

    Since then, incremental backups of small amounts of information have been fast, but copying large amounts has been slow.

    Example: I used iPhoto Library Manager to rebuild my iPhoto library database (see the Faces problems) and then had to backup 46GB of photos again. This took 4 hours to backup on TM, but would copy directly from the finder in just over an hour (which I did as a precaution to a USB drive).

    Time machine under SL is definitely slower at times. But I'm glad when it's faster
    MacBook Pro 1.83GHz, Mac OS X (10.6), 2GB RAM
  • tahsali Level 1 Level 1 (20 points)
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    Sep 5, 2009 8:20 AM (in response to apurva_kansara)
    same here. Really F_)(*()en slow to a firewire G drive. 1 hour for 20 MB? what the F is going on with this SL.
    15 " Intel Core 2 Duo 2.4 GHz, Mac OS X (10.6)
  • The Real Sean Level 1 Level 1 (40 points)
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    Sep 5, 2009 2:44 PM (in response to tahsali)
    I'm seeing similar issues. It's my first backup to a USB 2.0 drive, and it's taken 6 hours to copy 25GB of files. The drive is working fine for file copies in the Finder, since my 20GB Warcraft folder copies in a matter of minutes. The Finder is taking 80-90% of the processor time while this is running.

    The drive is formatted as HFS+ journaled, using GUID, and it was freshly formatted before I set-up Time Machine. Spotlight is not indexing the external drive, and I've no anti-virus software running in the background.
    MacBook Pro 1.5GHz, Mac OS X (10.6)
  • Pondini Level 8 Level 8 (38,710 points)
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    Sep 5, 2009 5:48 PM (in response to The Real Sean)
    The Real Sean wrote:
    I'm seeing similar issues. It's my first backup to a USB 2.0 drive, and it's taken 6 hours to copy 25GB of files. The drive is working fine for file copies in the Finder, since my 20GB Warcraft folder copies in a matter of minutes. The Finder is taking 80-90% of the processor time while this is running.

    The drive is formatted as HFS+ journaled, using GUID, and it was freshly formatted before I set-up Time Machine. Spotlight is not indexing the external drive, and I've no anti-virus software running in the background.


    If your first backup after installing SL is very slow, and/or it's trying to do a full backup when you only did the normal install (no erasing and reloading), cancel the backup, do a Restart, re-select your TM drive (select "none" first) and try again.

    It does not matter if you've done other restarts; you must let TM start a backup first, for some bizarre reason.

    The tortoise becomes a jet!
    24" iMac 2.66 GHz Intel; 4gb; 640 gb, Mac OS X (10.6), AEBS
  • Richard Friedman Calculating status...
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    Sep 6, 2009 12:28 AM (in response to Pondini)
    Thank you for the hint! After 11 hours I was still under half way done with what TM was telling me should be a 240GB backup. So I stopped the backup, turned TM off. Restarted the MacPro, set the TM drive to None, deleted everything on the TM drive, and started TM all over again, reselecting my designated TM drive.

    Now, ten minutes into it, TM says it's done 10GB, and activity monitor says the I/O transfers are now on the order of 100MB/sec. Before the disk monitor was saying 9MB/sec reading, and 50KB/sec writing!

    I would call this, having to do a useless partial backup to prime the pump as it were, a primo bug!
    MacPro Quad Core Nehalem, Mac OS X (10.6), 6GB RAM, 1x640GB, 2x1TB disks internal
  • RonaldMHofmann Level 2 Level 2 (160 points)
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    Sep 6, 2009 5:55 AM (in response to apurva_kansara)
    I have a completely fresh installed Snow Leopard on my iMac 2.16 GHz, 250 GB harddisk and a newly formatted HFS (journaled) myBook (1TB) external USB2.0 connected directly to the iMac. No virus scanning software.

    I made a complete backup, all external harddisk excluded.

    It took two days to backup 67 GB from my internal HD to myBook. This is way too slow.
    iMac Core2Duo/2 GB, iPhone 3.0, Mac OS X (10.6)
  • Richard Friedman Level 1 Level 1 (45 points)
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    Sep 6, 2009 8:48 AM (in response to Richard Friedman)
    Well, it started out fast, but an hour into it TM slowed down to the pace I'd experienced before. Searchlight isn't running, and besides I added the TM drive to the list of exceptions.

    TM says it is backing up 184 GB. I let it run overnight (8 hours) and it's up to 175GB. Close, and somewhat faster than last night.

    The 1TB TM is internal. Nothing else was running on the system.

    Lets hope that the hourly and daily backups run faster than that.

    (So what happens if it takes longer than an hour to complete an hourly backup?)
    MacPro Quad Core Nehalem, Mac OS X (10.6)
  • Pondini Level 8 Level 8 (38,710 points)
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    Sep 6, 2009 8:57 AM (in response to Richard Friedman)
    Richard Friedman wrote:
    Well, it started out fast, but an hour into it TM slowed down to the pace I'd experienced before. Searchlight isn't running, and besides I added the TM drive to the list of exceptions.

    TM says it is backing up 184 GB. I let it run overnight (8 hours) and it's up to 175GB. Close, and somewhat faster than last night.


    That's 22 gb/hour. About half what I get to an external (overall-- the rates vary wildly).

    The 1TB TM is internal. Nothing else was running on the system.


    Are both formatted the same (if one's case-sensitive and the other isn't, backups will be slow and restores may fail). Double-check via Disk Utility.

    Lets hope that the hourly and daily backups run faster than that.


    If they seem larger than expected, see item #D4 in the Time Machine - Troubleshooting *User Tip.*

    (So what happens if it takes longer than an hour to complete an hourly backup?)


    Another will start immediately.
    24" iMac 2.66 GHz Intel; 4gb; 640 gb, Mac OS X (10.6), AEBS
  • Cindy Calculating status...
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    Sep 6, 2009 9:01 AM (in response to Pondini)
    My backup came to a total stand-still. I went to disk utilities to check the backup hd and ran repair disk. It did not find anything but when I went back to backup it started going real fast. So I don't know whether it was stopping the backup and restarting or running disk utilities on it but something kick started her.
    Mac Pro 2.66 5gb ram, Mac OS X (10.6)
  • Pondini Level 8 Level 8 (38,710 points)
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    Sep 6, 2009 9:40 AM (in response to Cindy)
    Cindy wrote:
    My backup came to a total stand-still. I went to disk utilities to check the backup hd and ran repair disk. It did not find anything but when I went back to backup it started going real fast. So I don't know whether it was stopping the backup and restarting or running disk utilities on it but something kick started her.


    The speed of TM backups, especially large ones, does fluctuate a great deal, even under normal circumstances. They will even appear to stop, then continue.

    If yours seem slow again, try the things in item #D2 of the Time Machine - Troubleshooting *User Tip.*
    24" iMac 2.66 GHz Intel; 4gb; 640 gb, Mac OS X (10.6), AEBS
  • The Real Sean Level 1 Level 1 (40 points)
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    Sep 7, 2009 5:05 AM (in response to Pondini)
    Thanks Pondini. Appreciate the tip.
    MacBook Pro 1.5GHz, Mac OS X (10.6)
  • velocity08 Calculating status...
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    Oct 19, 2009 5:47 PM (in response to apurva_kansara)
    Hi every one had the same problem for a while and had tried everything but discovered a solution that has helped me out and hope that it helps others as hours have been burnt trying to get this running.

    so here we go.

    Restart your Mac with the boot up media/ CD/ DVD
    open disk utility
    repair back up drive
    repair local disk
    repair permission local disk
    boot back in to SL
    go to your back up drive
    open Backups.backupdb folder
    find your back up folder (it will be named the same as your machine)
    locate your current backup temporary file (this is not a folder but a file that is used to store and create your latest backup of your system it will look different so don't remove the wrong one)
    move it to the trash
    empty the trash (this will take a while depending on the size of temp file)
    once completed run time machine again.

    this time time machine will run a lot faster in determining the backup required, the the actual back up process will be a lot quicker once the first back up is created.

    I went from waiting over 24 hours for a backup which ended up either failing or crashing my system to a 1st time complete back up in less than an hour and the incremental backups are much quicker.

    for some reason the temp file gets corrupted no idea why but this has seemed to fix it for me.

    I am backing up over 150 GB on my local disk and about 350GB on another external disk drive to my back up drive.

    Drives is connected by Firewire 800

    let me know if I can b of further assistance.

    ""Cheers
    MacBook Pro 2.5 GHz, 2GB Ram, 200 GB HDD, Mac OS X (10.6.1)

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