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    PC unbootable after capture fails

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    • Tom ElliottT
      Tom Elliott
      last edited by

      What if you redo the check disk but add the /R switch?

      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

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      1 Reply Last reply Reply Quote 1
      • dolfD
        dolf
        last edited by

        I scanned for bad sectors the day before yesterday, and there were none, so it should be fine.

        Resizing the file system in debug mode now. There is no indication of progress, so I’m guessing that is uses ntfsresize, but the output is piped elsewhere? Is the output of ntfsresize logged somewhere?

        1 Reply Last reply Reply Quote 0
        • dolfD
          dolf
          last edited by

          There’s the problem!

          0_1468366660855_NTFS.png

          The partclone log shows the same thing which I snapped here:

          0_1468366923475_partclone.jpg

          Is the “ntfs flag” the same thing as the “dirty flag”? I could clear it using ntfsfix --clear-dirty /dev/sda2, but I would like to see why it failed in the first place…

          But I tried it in any case. First a dry run:

          0_1468367623696_ntfsfix-n.jpg

          Then the real deal:

          0_1468367634413_ntfsfix.jpg

          With no luck.

          Wayne WorkmanW 2 Replies Last reply Reply Quote 0
          • Wayne WorkmanW
            Wayne Workman @dolf
            last edited by

            @dolf It’s not a dirty flag that I’ve seen before - here’s an article on the Windows Dirty bit:
            https://wiki.fogproject.org/wiki/index.php?title=Windows_Dirty_Bit

            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
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            • Wayne WorkmanW
              Wayne Workman @dolf
              last edited by Wayne Workman

              @dolf During the capture debug task, can you run these commands?
              fdisk -l
              lsblk

              Please give us the output of both.

              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
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              • dolfD
                dolf
                last edited by

                0_1468368584025_20160713_020714.jpg

                Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                • Wayne WorkmanW
                  Wayne Workman @dolf
                  last edited by

                  @dolf is that from the reference machine or after deployment?

                  Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
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                  • dolfD
                    dolf
                    last edited by

                    @Wayne-Workman What do you mean? It’s right after the previous images, same computer, same everything. The output of lsblk and fdisk -l was taken right after the Volume is corrupt. You should run chkdsk. error.

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                    • dolfD
                      dolf
                      last edited by

                      Just to verify that this is not a hardware issue, I restored the image to another PC using CloneZilla, and tried to capture using FOG. Same results! The resize step totally corrupts the MFT, leaving the PC unbootable.

                      Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                      • Wayne WorkmanW
                        Wayne Workman @dolf
                        last edited by Wayne Workman

                        @dolf Just throwing this out there, is it possible to successfully capture a non-resizable multiple partition image and deploy it? This would just be a test to see if the resizing is the issue or not.

                        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
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                        • dolfD
                          dolf
                          last edited by

                          Is the partition table manipulated in any way when capturing a non-resizable multiple partition image? If not, it probably works just like CloneZilla, which I’m using now. And that works.

                          I’ll test your idea as soon as I have time. For now, I’m trying to work around the issue to save time. Working through the night to get the image ready. 200 PCs to deploy soon…

                          Where can I find the exact ntfsresize command used by FOS? I looked at the fog.upload script while in FOS, and there was a call to shrinkPartition or something like that, but I couldn’t find where the call to ntfsresize happens. I would like to type that exact command on a terminal and see what happens.

                          Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                          • Wayne WorkmanW
                            Wayne Workman @dolf
                            last edited by Wayne Workman

                            @dolf said in PC unbootable after capture fails:

                            Where can I find the exact ntfsresize command used by FOS?

                            it’s in the init, but you can view the source code of the init in your trunk source. It’s here, line 196 to be exact.

                            <Trunk Directory>/src/buildroot/package/fog/scripts/usr/share/fog/lib/funcs.sh

                            0_1468382423288_Screenshot from 2016-07-12 22-59-28.png

                            Also some stuff around 460 and 490 and 508
                            0_1468382552577_Screenshot from 2016-07-12 23-02-07.png

                            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
                            Daily Clean Installation Results:
                            https://fogtesting.fogproject.us/
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                            • dolfD
                              dolf
                              last edited by

                              Back at it! I tried resizing with GParted, which is known to very carefully check everything before touching the drive. I simply booted GParted Live, and resized the big partition, sda2 to a minimum. Here is the log: gparted_details.htm

                              Maybe FOG could learn from (or even directly use) GParted in this regard 🙂

                              Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                              • Wayne WorkmanW
                                Wayne Workman @dolf
                                last edited by Wayne Workman

                                @dolf I am not sure why resizing isn’t working for you. I’ve created hundreds of images with fog - most re-sizable - for Windows 7, 8, 8.1, 10, ubuntu, CentOS, Fedora - I’ve not had the problems that you’ve had. All my co-workers use resizable. We have probably 30 different hardware models from various manufacturers at work, they all work fine with fog. Many community members here use resizable images, seldom do issues with resizing come up.

                                We need to troubleshoot what’s going on with your particular setup - and see what can be done.

                                I particularly think something is wrong with the MBR. After deploying a resizable image (captured by fog), you can boot to a linux live disk and likely be able to mount the HDD and read all the files just fine, copy to and fro, and run other diagnostics. I really doubt that the resizing is breaking it, I really think it’s something with the MBR.

                                As a sort of test, after capturing a resizable image with fog, you can trade out the mbr fog captured with the mbr that CloneZilla captured, set permissions, and try to deploy. See what happens.

                                Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
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                                dolfD 1 Reply Last reply Reply Quote 0
                                • dolfD
                                  dolf @Wayne Workman
                                  last edited by

                                  @Wayne-Workman Good to hear that it works for you. The fact that it usually works, but didn’t work for me is the definition of an edge case. And things should not break when edge cases happen.

                                  I just realized that I unknowingly tested exactly what you suggested, and that’s probably why it worked. When I try to resize the problematic image, however, I get this: gparted_details_bad.htm

                                  Still, GParted wins, because it safely terminates before destroying the disk. FOG should, too.

                                  This discussion shows that most people aren’t really sure why this happens. We could use the following algorithm to work around the problem (expanding on what GParted does):

                                  increment := "1GB or a certain percentage of the disk size"
                                  partition = /dev/sda2
                                  
                                  calibrate partition
                                  
                                  target_size := check file system on partition for errors and fix them and get estimate of smallest supported shrunken size
                                  
                                  if there are errors
                                    stop
                                  
                                  do
                                    simulate resizing to target_size
                                    target_size += increment
                                  while simulation fails and target_size < disk_size
                                  
                                  if target_size < disk_size
                                    // this means the simulation must have succeeded for the current value of target_size
                                    actually resize the file system
                                    actually resize the partition
                                    // note that file systems and partitions are not the same thing, and are not necessarily the same size... TODO: this is yet another edge case to consider
                                  
                                  // if all simulations failed, we just don't resize the disk, and the capture process can still continue uninterrupted
                                  
                                  
                                  Tom ElliottT 1 Reply Last reply Reply Quote 0
                                  • dolfD
                                    dolf
                                    last edited by

                                    Sorry, actually no, the image where the resize succeeded has the same mbr, but fewer files in sda2 (about 10GB less than the one that fails to resize).

                                    The suggestion for making the capture process safer still holds, though 🙂

                                    I even tested it: If I resize to 70GB instead of the minimum (about 66GB), it works just fine. I suspect that it isn’t possible to know exactly what the minimum size of an NTFS partition will be without simulating. That’s probably why the authors of ntfsresize include messages like this (emphasis mine):

                                    • Estimating smallest shrunken size supported …
                                    • You might resize at 71189536768 bytes or 71190 MB (freeing 178764 MB).
                                    • Please make a test run using both the -n and -s options before real resizing!

                                    Luckily, simulation takes about 10 seconds for a 250GB drive, so it won’t be a large performance hit.

                                    Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                                    • Wayne WorkmanW
                                      Wayne Workman @dolf
                                      last edited by

                                      @dolf I agree with all of that. How good are you with shell script?

                                      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
                                      Daily Clean Installation Results:
                                      https://fogtesting.fogproject.us/
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                                      • Tom ElliottT
                                        Tom Elliott @dolf
                                        last edited by

                                        @dolf While I understand what you’re saying, I don’t think it should continue going. I agree it should not, in the least, actually resize the partition unless we know absolutely all will continue fine down the road (which is not very practical, as I don’t know of a way to “dry_run” the fog system before actually performing tasks to test for all these edge cases. The reason there are different image types (resize, non-resize, raw) is to allow people to use what will suit them best. If resize is going to cause issues, I think it wise to fail to upload, but not attempt altering the disk.

                                        Can you post the contents of your image’s (broken please) d1.fixed_size_partitions file? I suspect what’s occurring is an unexpected partition is resizing, thus moving the start sector of the next partition. That I can fix, though I don’t know where to begin.

                                        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                        dolfD 1 Reply Last reply Reply Quote 1
                                        • dolfD
                                          dolf @Tom Elliott
                                          last edited by

                                          @Wayne-Workman I’m not great at shell scripting. I google about 5 pages for every line I write. I mostly do Python, PHP and C.

                                          @Tom-Elliott I’ll have to dissapoint you 😛

                                          1
                                          
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                                          • Tom ElliottT
                                            Tom Elliott
                                            last edited by

                                            Another thing comes to mind as well.

                                            FOG Does run some math to calculate the smallest size of the partition plus a little more (wiggle room if you will). I may need to see an upload again using debug and at the point it’s testing (once complete) break out and see what is showing for the ntfsresize variable.

                                            lsblk and fdisk -l would also, possibly, be extremely helpful as well (before AND after).

                                            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                                            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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