I've installed Snapshot on two of my sites. The first one

I've installed Snapshot on two of my sites.

The first one ran great!

The 2nd one says it is starting but nothing happens?

I have all the same settings?

How can I trouble shoot?

  • Paul

    @pgowder,

    Sorry for the delay. I'll try and help. Reading the replies to the questions from Ari. You are running two individual non-Multisite WordPress site, correct. On one Snapshot works but on the other no. Hmm.

    What exactly does not work? How exactly are you initiating a Snapshot backup? Are you seeing any errors on the screen?
    Are the sites about the same site?
    Do you have FTP access? In you do try looking at the logs from Snapshot in wp-content/uploads/snapshots/_logs/ You might need to try again to create an archive via snapshot to ensure you have the latest log file.

  • Paul

    @pgowder,

    Other questions:

    Do both site have similar wp-config.php settings as far as memory ( http://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP ) and debug ( http://codex.wordpress.org/Editing_wp-config.php#Debug )

    Also go to Snapshots > Settings. There is a panel 'System Info' which will report various parameters of your site. I would expect these to be pretty close since they are running on the same server. But some settings may be unique. Please advise what is different between the two sites.

  • pgowder

    Sorry for the delay. I'll try and help. Reading the replies to the questions from Ari. You are running two individual non-Multisite WordPress site, correct. On one Snapshot works but on the other no. Hmm.

    Yes, that is correct.

    What exactly does not work? How exactly are you initiating a Snapshot backup? Are you seeing any errors on the screen?

    I'm clicking run now on the All Snapshots page.

    It shows that it is creating archive. After a few minutes I refresh, and it show that the next snapshot is on the regular scheduled date. No error, but backup didn't finish.

    Are the sites about the same site?
    Do you have FTP access? In you do try looking at the logs from Snapshot in wp-content/uploads/snapshots/_logs/ You might need to try again to create an archive via snapshot to ensure you have the latest log file.

    What do you mean same site?

    I do have ftp access. I'll get the log.

  • pgowder

    Here is the log from today.

    2014-03-12 14:44:26: init
    2014-03-12 14:44:29: table: wp_commentmeta segment: 1/11
    2014-03-12 14:44:29: table: wp_commentmeta segment: 1/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 2/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 2/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 3/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 3/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 4/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 4/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 5/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 5/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 6/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 6/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 7/11
    2014-03-12 14:44:30: table: wp_commentmeta segment: 7/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 8/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 8/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 9/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 9/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 10/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 10/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 11/11
    2014-03-12 14:44:31: table: wp_commentmeta segment: 11/11
    2014-03-12 14:44:32: table: wp_comments segment: 1/4
    2014-03-12 14:44:32: table: wp_comments segment: 1/4
    2014-03-12 14:44:33: table: wp_comments segment: 2/4
    2014-03-12 14:44:33: table: wp_comments segment: 2/4
    2014-03-12 14:44:33: table: wp_comments segment: 3/4
    2014-03-12 14:44:33: table: wp_comments segment: 3/4
    2014-03-12 14:44:34: table: wp_comments segment: 4/4
    2014-03-12 14:44:34: table: wp_comments segment: 4/4
    2014-03-12 14:44:35: table: wp_links segment: 1/1
    2014-03-12 14:44:35: table: wp_links segment: 1/1
    2014-03-12 14:44:35: table: wp_options segment: 1/1
    2014-03-12 14:44:35: table: wp_options segment: 1/1
    2014-03-12 14:44:35: table: wp_postmeta segment: 1/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 1/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 2/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 2/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 3/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 3/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 4/798
    2014-03-12 14:44:35: table: wp_postmeta segment: 4/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 5/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 5/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 6/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 6/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 7/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 7/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 8/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 8/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 9/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 9/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 10/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 10/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 11/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 11/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 12/798
    2014-03-12 14:44:36: table: wp_postmeta segment: 12/798
    2014-03-12 14:44:37: table: wp_postmeta segment: 13/798
    2014-03-12 14:44:37: table: wp_postmeta segment: 13/798
    2014-03-12 14:44:37: table: wp_postmeta segment: 14/798
    2014-03-12 14:44:37: table: wp_postmeta segment: 14/798
    2014-03-12 14:44:37: table: wp_postmeta segment: 15/798
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    2014-03-12 14:44:37: table: wp_postmeta segment: 16/798
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    2014-03-12 14:44:37: table: wp_postmeta segment: 17/798
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    2014-03-12 14:44:37: table: wp_postmeta segment: 18/798
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    2014-03-12 14:44:38: table: wp_postmeta segment: 19/798
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    2014-03-12 14:44:38: table: wp_postmeta segment: 20/798
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    2014-03-12 14:44:38: table: wp_postmeta segment: 21/798
    2014-03-12 14:44:38: table: wp_postmeta segment: 21/798
    2014-03-12 14:44:38: table: wp_postmeta segment: 22/798
    2014-03-12 14:44:38: table: wp_postmeta segment: 22/798
    2014-03-12 14:44:38: table: wp_postmeta segment: 23/798
    2014-03-12 14:44:38: table: wp_postmeta segment: 23/798
    2014-03-12 14:44:38: table: wp_postmeta segment: 24/798
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    2014-03-12 14:44:38: table: wp_postmeta segment: 25/798
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    2014-03-12 14:44:38: table: wp_postmeta segment: 26/798
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    2014-03-12 14:44:39: table: wp_postmeta segment: 27/798
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    2014-03-12 14:44:39: table: wp_postmeta segment: 29/798
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    2014-03-12 14:44:39: table: wp_postmeta segment: 31/798
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    2014-03-12 14:44:39: table: wp_postmeta segment: 32/798
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    2014-03-12 14:44:40: table: wp_postmeta segment: 33/798
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    2014-03-12 14:44:40: table: wp_postmeta segment: 34/798
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    2014-03-12 14:44:40: table: wp_postmeta segment: 35/798
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    2014-03-12 14:44:40: table: wp_postmeta segment: 36/798
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    2014-03-12 14:44:40: table: wp_postmeta segment: 37/798
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    2014-03-12 14:44:41: table: wp_postmeta segment: 38/798
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    2014-03-12 14:44:41: table: wp_postmeta segment: 39/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 39/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 40/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 40/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 41/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 41/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 42/798
    2014-03-12 14:44:41: table: wp_postmeta segment: 42/798
    2014-03-12 14:44:42: table: wp_postmeta segment: 43/798
    2014-03-12 14:44:42: table: wp_postmeta segment: 43/798
    2014-03-12 14:44:42: table: wp_postmeta segment: 44/798
    2014-03-12 14:44:42: table: wp_postmeta segment: 44/798
    2014-03-12 14:44:42: table: wp_postmeta segment: 45/798
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    2014-03-12 14:44:42: table: wp_postmeta segment: 46/798
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    2014-03-12 14:44:44: table: wp_postmeta segment: 53/798
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    2014-03-12 14:44:44: table: wp_postmeta segment: 55/798
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    2014-03-12 14:44:45: table: wp_postmeta segment: 56/798
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    2014-03-12 14:44:45: table: wp_postmeta segment: 57/798
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    2014-03-12 14:44:45: table: wp_postmeta segment: 58/798
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    2014-03-12 14:44:46: table: wp_postmeta segment: 60/798
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    2014-03-12 14:44:46: table: wp_postmeta segment: 62/798
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    2014-03-12 14:44:47: table: wp_postmeta segment: 63/798
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    2014-03-12 14:44:48: table: wp_postmeta segment: 66/798
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    2014-03-12 14:44:49: table: wp_postmeta segment: 70/798
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    2014-03-12 14:44:49: table: wp_postmeta segment: 71/798
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    2014-03-12 14:44:49: table: wp_postmeta segment: 72/798
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    2014-03-12 14:45:56: table: wp_postmeta segment: 205/798
    2014-03-12 14:45:56: table: wp_postmeta segment: 205/798
    2014-03-12 14:45:56: table: wp_postmeta segment: 206/798
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    2014-03-12 14:45:59: table: wp_postmeta segment: 213/798
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    2014-03-12 14:46:00: table: wp_postmeta segment: 214/798
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    2014-03-12 14:46:00: table: wp_postmeta segment: 215/798
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    2014-03-12 14:46:01: table: wp_postmeta segment: 216/798
    2014-03-12 14:46:01: table: wp_postmeta segment: 216/798
    2014-03-12 14:46:01: table: wp_postmeta segment: 217/798
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    2014-03-12 14:46:03: table: wp_postmeta segment: 218/798
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    2014-03-12 14:46:05: table: wp_postmeta segment: 219/798
    2014-03-12 14:46:05: table: wp_postmeta segment: 219/798
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    2014-03-12 14:46:07: table: wp_postmeta segment: 220/798
    2014-03-12 14:46:09: table: wp_postmeta segment: 221/798
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    2014-03-12 14:46:10: table: wp_postmeta segment: 222/798

  • Paul

    @pgowder,

    Are the sites about the same site?

    I meant are the sites about the same SIZE? (darn auto-correct!)

    Thanks for the log. So that is where it end nothing else past the last line you provided?

    What about the information from the Snapshots > Settings > System Info panel?

    Besides the 'run now' option have you tried running it interactively? Edit the Snapshot item. Go to the 'When to Archive' section and select 'Run Immediately' from the drop down. Then go to the bottom and submit the form.

    I'm hoping this will have some better errors. You might also want to enable WP_DEBUG in your wp-config.php so it will actually report the issue.

  • Paul

    @pgowder,

    Seeing lots of errors in the log?

    And that is the beauty of turing on WP_DEBUG. It will show every single warning/error from not only Snapshot but all other plugins as well as any from WordPress. Does it give any more details. Can you provide a link so I can download the entire log file and review?

    Files is 0%.

    Did you select any files for this archive? As we are testing can we stick first to the core WP database tables only. Trying to still figure out of the issue is just the size of the site and want to get a few runs with just database tables first. Then expand to files and non-core DB tables.

    Also on Snapshot > Settings go to the bottom of the page output. You should see the setting for 'Compression Library'. Which option are you using? Default is PclZIP. Might want to try switching that to ZipArchive. For larger sites ZipArchive seems to have better luck. Though it is marginal.

  • Paul

    @pgowder,

    It says destination complete. But the db files did not upload. And it didn't finish files.

    I'm not really sure anymore. Something is going on at the server level as it appears snapshot just stops. No errors or anything reported. The strange part is snapshot works on one of your sites on the same server. At this point I don't really have an answer. It very well could be something outside of Snapshot and even WordPress which is preventing the completion of the task.

  • Paul

    @pgowder,

    Do you have access to the server logs to see if there are any PHP errors or Apache errors being encountered? How long does the sync task generally run? Does it appear to be stopping almost immediately or does it run for a while before being stopped? If it does run for a while it could be a PHP timeout. Most server configurations have a PHP setting 'max_execution_time' set yo 30 or 60 seconds. So it could be that your system is stopping the snapshot sync. I'm not saying snapshot is without fault of issue. But so far I've not seen any evidence this is something with snapshot.

  • pgowder

    Do you have access to the server logs to see if there are any PHP errors or Apache errors being encountered?

    I have access to the logs. There are no errors related to this. I'm running again now just to make sure.

    How long does the sync task generally run? Does it appear to be stopping almost immediately or does it run for a while before being stopped? If it does run for a while it could be a PHP timeout. Most server configurations have a PHP setting 'max_execution_time' set yo 30 or 60 seconds. So it could be that your system is stopping the snapshot sync. I'm not saying snapshot is without fault of issue. But so far I've not seen any evidence this is something with snapshot.

    For most sites, isn't it going to take more than 60 seconds?

    Can you set something in the script to continue running or to refresh the task?

  • Paul

    @pgowder,

    Hmm. Can I have access to your site so I can see this first-hand. Something is going on and I just don't know what to tell you to look for. Generally if this is an error with the Dropbox connection Snapshot will write it to the logs. Again is sounds like something is just killing snapshot after it runs a while.

    Please use the contact form https://premium.wpmudev.org/contact/
    On the drop down select 'I have a different question'. In the body reference this thread and mention my name. Please provide wp-admin and if you can FTP access so I can try adding some debug output to Snapshot.

  • Paul

    @pgowder,

    Ok. I've made some progress. I was able to watch the logs during the run now processing. I was able to get the sync to complete but I had to exclude the postmeta table.

    You had the segment size on Snapshots > Settings to very low at 1000 records. I upped this to 10,000 and still wad not able to get the postmeta table included. There is something with the dumping of records that is just taking too long. You have see this following from your previous post.

    2014-03-12 14:45:56: table: wp_postmeta segment: 205/798
    2014-03-12 14:45:56: table: wp_postmeta segment: 206/798
    2014-03-12 14:45:56: table: wp_postmeta segment: 206/798
    2014-03-12 14:45:57: table: wp_postmeta segment: 207/798

    Even with the segment size set at 1000 record the output should be much quicker on a server. Basically what snapshot is doing is dumping sections or records from the wp_postmeta table so records 1-1000, then 1001-2000, then 2001-3000, etc. On each segment it writes to the end of a master files. Once all the records are dumped it compresses the file and adds it to the zip archive. But the process just keeps getting stopped in the middle of the dump processing.

    From what I can tell when I set the segment size to 10,000 from the logs I was seeing 26/80, 27/80 almost at 5 second intervals. So even at 80 segments * 10,000 segment size = 800,000 that is a lot of records. Still I've see Snapshot handle gigs of database tables.

    Excluding the wp_postmeta I was able to get the snapshot process to finish.

  • Paul

    @pgowder,

    Any update?

    I was able to download a copy of your postmeta table. It is barely 7Mb in size. Still it took almost 10 minutes to generate on your system.

    Once I had the table I added it to one of my large sites on my public server. Ran snapshot just on the table and it was dumped in 5.6 seconds. Ran a full snapshot and the complete 285M archive was generated in less than a minute.

    So again I'm not sure. This sounds like something on your server but not being a system admin I really don't know what to suggest. You have two issues.

    1. You appear to have a timeout which will stop long running PHP processes. Snapshot will attempt to extend the timeout used in PHP. But this does not always work as the server can still stop long running processes.

    2. You seems to have very slow disk I/O. Meaning writes to files is very slow for some reason. Again not sure why.

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