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| Are symbolic links to data dirs preserved in upgrade? http://forums.linhes.org/viewtopic.php?f=1&t=7251 |
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| Author: | tuatara [ Tue Dec 06, 2005 2:49 pm ] |
| Post subject: | Are symbolic links to data dirs preserved in upgrade? |
Hi there, I have a my /myth/video and /myth/tv dirs symbolically linked to /data/video and /data/tv respectively. /data is a the mount point for a large (400G) external disk. (There is a reason why - to do with preserving lots of tv and video data when moving to knoppmyth from std mythtv install.) I'm currently running R5A15.1, and I am looking to upgrade to R5A26. My question is: will the upgrade preserve my video and tv data given the symbolic links above? Many thanks for your help. Paul. |
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| Author: | cesman [ Tue Dec 06, 2005 3:08 pm ] |
| Post subject: | |
On an a auto-upgrade, /dev/hda1 (/) is wiped clean. So the question is where do you have those symlinks? |
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| Author: | tuatara [ Wed Dec 07, 2005 1:15 am ] |
| Post subject: | |
cesman wrote: On an a auto-upgrade, /dev/hda1 (/) is wiped clean. So the question is where do you have those symlinks?
Hi there - thanks for getting back to me. My structure is as follows: Code: ~$ mount /dev/hda1 on / type ext3 (rw,errors=remount-ro) none on /proc type proc (rw,nodiratime) /dev/hda3 on /cache type ext2 (rw,noatime) /dev/hda4 on /myth type ext3 (rw,noatime) sysfs on /sys type sysfs (rw) /dev/sda1 on /data type ext3 (rw,noatime) usbfs on /proc/bus/usb type usbfs (rw) ~$ On the internal disk: root and home are on /dev/hda1 (3.5GB) /myth is on /dev/hda4 (150GB) /cache is on /dev/hda3 (10GB) On the external disk: /data is on /dev/sda1 (400GB) Looking at /myth, you can see the links: Code: ~$ ls -l /myth
total 76 drwxr-xr-x 6 www-data www-data 4096 Oct 19 2004 avimanager drwxrwxr-x 2 mythtv mythtv 4096 Jun 18 10:34 backup drwxrwxr-x 3 mythtv mythtv 4096 Jun 18 19:52 gallery drwxrwxr-x 6 mythtv mythtv 4096 May 8 2005 games drwxrwxrwx 2 mythtv mythtv 12288 Dec 6 22:47 image_cache drwx------ 2 mythtv mythtv 16384 May 8 2005 lost+found drwxrwxr-x 220 mythtv mythtv 12288 Nov 16 20:49 music drwxrwxr-x 8 mythtv mythtv 4096 Nov 14 21:18 nuv2disc drwxrwxrwx 3 mythtv mythtv 4096 Nov 29 07:34 playlists drwxrwxr-x 3 mythtv mythtv 4096 Dec 5 22:23 tmp lrwxrwxrwx 1 root root 8 May 10 2005 tv -> /data/tv lrwxrwxrwx 1 root root 11 May 10 2005 video -> /data/video ~$ If I understand you, /dev/hda1 is wiped, but /dev/hda3 and 4 will remain unchanged. Therefore, my symbolic links in /myth will be preserved. However, since the external disk is mounted at /data - the mount point will disappear. So the symbolic links /myth/tv and /myth/video will point to nothing. As an aside, is it possible to change just the TV and VIDEO directories inside myth? Thanks for any advice you can provide. |
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| Author: | cecil [ Wed Dec 07, 2005 11:05 am ] |
| Post subject: | |
You can change any MythTV configuration you want. I'd suggest reading the MythTV docs is you have questions. |
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| Author: | tuatara [ Wed Dec 07, 2005 4:44 pm ] |
| Post subject: | Keeping data on external disk |
cecil wrote: You can change any MythTV configuration you want. I'd suggest reading the MythTV docs is you have questions.
Thanks - will do. So to conclude: - my video and TV data is on an external disk - that disk is mounted on /data. - /data will disappear during upgrade as /dev/hda1 is overwritten. The mount table will be replaced (right?) and the mount point will be deleted. The actual information on the external disk will not be touched. I think my question still stands: - how does one preserve tv/video data on an external disk during upgrade? Is the correct answer that I just do the upgrade, after which all the TV and video DB entries will point nowhere, then remount the external disk. Does the upgrade process check for Recordings and Videos that have missing data? (excuse my pickiness here - I want to be very careful not to lose this data. When I switched to knoppmyth from building mythtv myself, I had to manually reinsert all recordings for the kids saved stuff. What a pain!) Thanks again for your help. Cheers. Paul. |
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| Author: | tjc [ Wed Dec 07, 2005 5:56 pm ] |
| Post subject: | Re: Keeping data on external disk |
tuatara wrote: - /data will disappear during upgrade as /dev/hda1 is overwritten. The mount table will be replaced (right?) and the mount point will be deleted. The actual information on the external disk will not be touched.
I think my question still stands: - how does one preserve tv/video data on an external disk during upgrade? Since that disk won't be touched by the upgrade, and the MythTV code refuses to delete program entries from the database when it can't find the file on disk for exactly this reason, you don't have to do anything to preserve it. Also, during an upgrade even the /myth partition isn't touched so your links should still be there. To access it, save your current /etc/fstab and after recreating the mount point, either copy it back over or just cut and paste the entry for your data disk into the the post upgrade /etc/fstab. You can even just use the following sequence of post-upgrade commands as root. Code: mkdir /boot
# Remove the bogus entry for /dev/sda1 sed '/\/dev\/sda1/d' </etc/fstab >/etc/fstab.new # Add back the good one for it as /data echo '/dev/sda1 on /data type ext3 (rw,noatime)' >>/etc/fstab.new # Make sure it's not mounted umount /dev/sda1 # Flip the files mv /etc/fstab /etc/fstab.old mv /etc/fstab.new /etc/fstab # Remount the disk as /data mount /dev/sda1 |
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| Author: | tuatara [ Wed Dec 07, 2005 6:59 pm ] |
| Post subject: | I am good to go now... |
Thank you kindly for your help. Paul. |
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| Author: | tuatara [ Sat Dec 10, 2005 4:57 am ] |
| Post subject: | Upgrade trashes data... |
tjc wrote: Since that disk won't be touched by the upgrade, and the MythTV code refuses to delete program entries from the database when it can't find the file on disk for exactly this reason, you don't have to do anything to preserve it. Also, during an upgrade even the /myth partition isn't touched so your links should still be there.
Well - I completed the upgrade tonite, and I can report some emperical results: a) symbolic links were preserved. So on reboot just remounted the /data partition (great) b) all information in mythtv-setup is gone (channels, cards etc). Not a problem as its trivial to fix. however if the plan is to trash this data, we probably should run mythtv-setup after upgrade. (not so great) b) all information about music, videos and recorded tv programs is gone from the database (major bummer). After reboot, I remounted the external disk. Then checked the database, and "select * from recorded" gets nothing. From the front end, all music and video were empty until I rescanned music and video. bummer is that all the IMDB data and hand entered data is lost. Even worse is the loss of all information about recorded programs - I had a lot of the kids and S.O's programs in there, they will be royally p.o.'d when I break the news tomorrow morning. I'm looking at trying to manually reenter this data... ick. Is this a bug? If so is a pretty yukky one. I was upgrading from 15.1 to 26. Is it possible to reverse the upgrade? I did do a backup prior to upgrading. (sigh) I'm going to bed - this is one I need to walk away from for a day or so... Yours unhappily. Paul. |
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| Author: | tjc [ Sat Dec 10, 2005 10:12 am ] |
| Post subject: | Re: Upgrade trashes data... |
tuatara wrote: b) all information in mythtv-setup is gone (channels, cards etc). Not a problem as its trivial to fix. however if the plan is to trash this data, we probably should run mythtv-setup after upgrade. (not so great)
b) all information about music, videos and recorded tv programs is gone from the database (major bummer). Did you remember to do a backup (using /usr/local/bin/mythbackup)? This is called out quite clearly in the upgrade instructions: http://www.mysettopbox.tv/doc.html#autoupgrade and http://www.knoppmythwiki.org/index.php?page=KnoppMythInstall#autoupgrade If you have a backup the upgrade should restore from it automatically. I've typically got well over 100 recordings and 1000 songs on the KnoppMyth box and they come through every upgrade just fine. If you actually did do a backup, which wasn't restored by the upgrade for some reason, you can always run the restore (using /usr/local/bin/mythrestore) manually. |
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| Author: | tuatara [ Sun Dec 11, 2005 5:05 am ] |
| Post subject: | Re: Upgrade trashes data... |
tjc wrote: tuatara wrote: b) all information in mythtv-setup is gone (channels, cards etc). Not a problem as its trivial to fix. however if the plan is to trash this data, we probably should run mythtv-setup after upgrade. (not so great) b) all information about music, videos and recorded tv programs is gone from the database (major bummer). Did you remember to do a backup (using /usr/local/bin/mythbackup)? This is called out quite clearly in the upgrade instructions: http://www.mysettopbox.tv/doc.html#autoupgrade and http://www.knoppmythwiki.org/index.php?page=KnoppMythInstall#autoupgrade If you have a backup the upgrade should restore from it automatically. I've typically got well over 100 recordings and 1000 songs on the KnoppMyth box and they come through every upgrade just fine. If you actually did do a backup, which wasn't restored by the upgrade for some reason, you can always run the restore (using /usr/local/bin/mythrestore) manually. Hey there, Yes I did the backup - but I used backup from the Knoppmyth menu. I remember reading that it was the same. Of course the command line is better - you are sure to see if there were errors. When I restore now - it blanks the DB. So I assume my backup failed. Sigh. Nearly there with a manual restore. Thanks Paul. |
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| Author: | tjc [ Sun Dec 11, 2005 10:48 am ] |
| Post subject: | Re: Upgrade trashes data... |
tuatara wrote: Yes I did the backup - but I used backup from the Knoppmyth menu. I remember reading that it was the same. Of course the command line is better - you are sure to see if there were errors. Correct on both counts. tuatara wrote: When I restore now - it blanks the DB. So I assume my backup failed.
Ugh... Have you looked in the /myth/backup directory to see if there is anything in the mythconverg.sql file? Were there any errors produced by the restore? I'm wondering if you can just pull out the data for the recorded programs and maybe the settings and feed them in mysql since everything else can be reconstructed. Code: grep "\`settings\`" /myth/backup/mythconverg.sql
grep "\`recorded\`" /myth/backup/mythconverg.sql |
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| Author: | tuatara [ Mon Dec 12, 2005 2:01 am ] |
| Post subject: | Re: Upgrade trashes data... |
tjc wrote: tuatara wrote: Yes I did the backup - but I used backup from the Knoppmyth menu. I remember reading that it was the same. Of course the command line is better - you are sure to see if there were errors. Correct on both counts. tuatara wrote: When I restore now - it blanks the DB. So I assume my backup failed. Ugh... Have you looked in the /myth/backup directory to see if there is anything in the mythconverg.sql file? Were there any errors produced by the restore? I'm wondering if you can just pull out the data for the recorded programs and maybe the settings and feed them in mysql since everything else can be reconstructed. Code: grep "\`settings\`" /myth/backup/mythconverg.sql grep "\`recorded\`" /myth/backup/mythconverg.sql Checked - the backup file exists, but is empty! Interestingly an old backup file (mythconverg.sql.bak) is there from June with valid data. Its old but I should be able to copy some lines from it for some of the 'recorded' data. Thanks for the hints. Note for the future - dont use the GUI backup, use the command line one. |
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| Author: | tjc [ Mon Dec 12, 2005 8:03 pm ] |
| Post subject: | Re: Upgrade trashes data... |
tuatara wrote: Checked - the backup file exists, but is empty! So sorry to hear that. Rotten luck...  tuatara wrote: Thanks for the hints. Note for the future - dont use the GUI backup, use the command line one.
Yeah, or check the file. I'm very paranoid about this myself... |
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