Time Machine question
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From: Michael Fogler on 4 Jan 2010 08:18 I asked this before, but now I have more information. iMac 2.66 GHz, 4GB Ram. I have a Western Digital 500GB external drive used by Time Machine. Recently, all of the sudden I will get the message that Time Machine can't backup because the disk appears to be read only. I can launch Disk Utility, run Verify Disk (repair disk isn't available at that point) and it finds nothing wrong. After that, the disk now has that I can read and write. When I get the message that the backup disk appears to be read only, I can also eject the disk, unplug it and plug it back in, and then the disk shows that I can read and write. There are 2 users on this machine, one admin, one standard, but it doesn't seem to matter whether one or both users are logged in when this happens. Does anyone have any ideas on this? thanks, -- Michael Fogler http://michaelfogler.com
From: Paul Sture on 4 Jan 2010 19:09 In article <hhspq8$ffl$1(a)solani.org>, Michael Fogler <guitarist(a)michaelfogler.com> wrote: > I asked this before, but now I have more information. > > iMac 2.66 GHz, 4GB Ram. I have a Western Digital 500GB external drive > used by Time Machine. Recently, all of the sudden I will get the > message that Time Machine can't backup because the disk appears to be > read only. I can launch Disk Utility, run Verify Disk (repair disk > isn't available at that point) and it finds nothing wrong. After > that, the disk now has that I can read and write. When I get the > message that the backup disk appears to be read only, I can also eject > the disk, unplug it and plug it back in, and then the disk shows that I > can read and write. There are 2 users on this machine, one admin, one > standard, but it doesn't seem to matter whether one or both users are > logged in when this happens. > > Does anyone have any ideas on this? > I had a different symptom recently, where after a power cut Time Machine claimed that my external WD drive had "Ignore ownership on this volume" set. It didn't, even after dismounting and remounting. A reboot solved it in my case. Are you using the "Turbo driver" that came with the WD drive? I didn't install that on my system, since I found a cryptic comment on their web site which said that later versions of OS X give that speed up anyway. -- Paul Sture
From: Michael Fogler on 5 Jan 2010 07:59 >> I asked this before, but now I have more information. >> >> iMac 2.66 GHz, 4GB Ram. I have a Western Digital 500GB external drive >> used by Time Machine. Recently, all of the sudden I will get the >> message that Time Machine can't backup because the disk appears to be >> read only. I can launch Disk Utility, run Verify Disk (repair disk >> isn't available at that point) and it finds nothing wrong. After >> that, the disk now has that I can read and write. When I get the >> message that the backup disk appears to be read only, I can also eject >> the disk, unplug it and plug it back in, and then the disk shows that I >> can read and write. There are 2 users on this machine, one admin, one >> standard, but it doesn't seem to matter whether one or both users are >> logged in when this happens. >> >> Does anyone have any ideas on this? >> > > I had a different symptom recently, where after a power cut Time Machine > claimed that my external WD drive had "Ignore ownership on this volume" > set. It didn't, even after dismounting and remounting. > > A reboot solved it in my case. > > Are you using the "Turbo driver" that came with the WD drive? I didn't > install that on my system, since I found a cryptic comment on their web > site which said that later versions of OS X give that speed up anyway. I don't even know about Turbo driver, so I guess I'm not using it. I think I've narrowed this down that mine shows up as read only after the boot up in the morning (I shut down the computer each night before going to bed). This morning when I saw that the drive was said to be read only, I logged out and logged back in. And that returned the drive to read and write. Pretty strange. Any ideas? -- Michael Fogler http://michaelfogler.com
From: Kevin McMurtrie on 6 Jan 2010 12:08 In article <hhspq8$ffl$1(a)solani.org>, Michael Fogler <guitarist(a)michaelfogler.com> wrote: > I asked this before, but now I have more information. > > iMac 2.66 GHz, 4GB Ram. I have a Western Digital 500GB external drive > used by Time Machine. Recently, all of the sudden I will get the > message that Time Machine can't backup because the disk appears to be > read only. I can launch Disk Utility, run Verify Disk (repair disk > isn't available at that point) and it finds nothing wrong. After > that, the disk now has that I can read and write. When I get the > message that the backup disk appears to be read only, I can also eject > the disk, unplug it and plug it back in, and then the disk shows that I > can read and write. There are 2 users on this machine, one admin, one > standard, but it doesn't seem to matter whether one or both users are > logged in when this happens. > > Does anyone have any ideas on this? > > thanks, Mac OS X runs older unix permissions and newer hierarchical access control lists (ACLs) simultaneously in HFS+ disks. Unfortunately, support for it is extremely broken. Sometimes you can eliminate broken ACLs with this run as 'root' on the command line: chflags -R nouchg noschg /Volumes/your_disk_name chmod -N -R /Volumes/your_disk_name Do this for your backup disk only. -- I won't see Google Groups replies because I must filter them as spam
From: Michael Fogler on 6 Jan 2010 12:25
On 2010-01-06 12:08:47 -0500, Kevin McMurtrie <mcmurtrie(a)pixelmemory.us> said: > Michael Fogler <guitarist(a)michaelfogler.com> wrote: > >> I asked this before, but now I have more information. >> >> iMac 2.66 GHz, 4GB Ram. I have a Western Digital 500GB external drive >> used by Time Machine. Recently, all of the sudden I will get the >> message that Time Machine can't backup because the disk appears to be >> read only. I can launch Disk Utility, run Verify Disk (repair disk >> isn't available at that point) and it finds nothing wrong. After >> that, the disk now has that I can read and write. When I get the >> message that the backup disk appears to be read only, I can also eject >> the disk, unplug it and plug it back in, and then the disk shows that I >> can read and write. There are 2 users on this machine, one admin, one >> standard, but it doesn't seem to matter whether one or both users are >> logged in when this happens. >> >> Does anyone have any ideas on this? >> >> thanks, > > Mac OS X runs older unix permissions and newer hierarchical access > control lists (ACLs) simultaneously in HFS+ disks. Unfortunately, > support for it is extremely broken. > > Sometimes you can eliminate broken ACLs with this run as 'root' on the > command line: > > chflags -R nouchg noschg /Volumes/your_disk_name > > chmod -N -R /Volumes/your_disk_name > > Do this for your backup disk only. Is this done in Terminal? If so, how would I do this for backup disk only? -- Michael Fogler http://michaelfogler.com |