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Forum Discussion
Time Machine verification failure (again)
I know this has been discussed before but it seems like a perennial question. The problem occurred with my ReadyNAS Duo every few months and this is the second time it has happened with my RN102 ...
There were a couple of posts on this back in 2011-2012 - but just a few, and none after that. So this might not be a ReadyNAS issue per se.
One poster on the older threads said that he had isolated his problem. It apparently only occurred when time machine was running during a raid scrub. His work-around was to find a free utility on the Mac, which let him "window" time machine, so it didn't run during times the NAS was busy.
Sorry, when I said perennial, I meant 'out there'. There are threads numerous sites about this problem and they tend to point at the hardware as the cause.
I did a search before posting and didn't see a mention of a utility though I already started using a Time Machine scheduler to try to avoid overwhelming the system at busy times a few years ago in an attempt to get around this problem and since then, Time Machine only backs up once a day.
Yesterday's backup was incredibly slow, 1.4GB took about four hours, then today's seemed to stall at 279MB of 900MB before finally giving the dreaded message.
It was claimed way back when on here that it was a known bug in Lion - three (almost four) full OS X iterations ago. Since I originally encountered the problem back on Lion, on a PowerPC system, it continued through to my current Intel Mac via two entirely new system installations on clean drives and about eight completely replaced Time Machine backups. I might be forgiven for asking why it keeps happening to me (and the other poor victims) whilst others escape.
I can, however, say with absolute certainty, that it never happened before I started using a ReadyNAS for Time Machine backups.
okulo wrote:
...I can, however, say with absolute certainty, that it never happened before I started using a ReadyNAS for Time Machine backups.
I wasn't doubting you. Just saying its been a few years since anyone has posted this issue here, and I don't think any of the other posts were for OS6 systems.
It might be on Netgear's list anyway if there are support requests. You probably should report a bug at support.netgear.com (w/o opening a case if you want to avoid a charge).
Thanks.
My Mac is still busy creating a new backup so I am in the claustrophobic iPad environment. I will follow up your suggestion when I have a real keyboard in front of me.
Hi - happened here too.
My Time Machine appears to think that something has changed with the disk when there's been a firmware update or a power loss.
If my theory is correct, that this occurs because the ReadyNAS won't allow Time Machine to delete old backups (as seems arithmetically likely), it would mean that this was more likely to happen after an OS update on a Mac because the first Time Machine backup will have to accommodate all the changes in the new OS. I've noticed incremental updates cause a 7+GB backup. I imagine a full OS update is going to be at least that size but often with it comes additional updates such as Safari 9.0.
So, a large backup is more likely to reach the sparsebundle limit than a small one simply due to the fact that a large backup takes a bigger step towards filling the available space. I wouldn't like to comment about the new ReadyNAS OS as I didn't know about it until I read your post.
I'll be taking mine back to the supplier this Thursday and I'm very curious about what they are going to say, especially given Netgear's head in the sand **bleep**-Kafkaesque approach to the problem. But I won't be leaving the shop without a solution.
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