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(solved) Problem updating a not so old gentoo(2 months old)
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keenblade
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PostPosted: Tue Jul 02, 2013 4:58 am    Post subject: Reply with quote

zmedico, I have solved the problem with the logic I learned from you. Thank you very much.
eyoung100, thanks for your suggestion. I was about to do it, but fortunately I did not have to.
TomWij, thanks for your help, suggestions and the time you spend.
I love this community. Both friendly and knowledgeable people are all around us.
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Need help to get it working: "x-fi surround 5.1"
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keenblade
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PostPosted: Tue Jul 02, 2013 5:06 am    Post subject: Reply with quote

zmedico wrote:
I do all of my big updates in a chroot (a btrfs snapshot of my root fs), so I never have to worry about stuff like that.

I am very interested in this. Do you have a tutorial or doc about doing updates in chroot with btrfs snapshot? Is btrfs matured enough to be used as main fs?
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Need help to get it working: "x-fi surround 5.1"
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zmedico
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PostPosted: Tue Jul 02, 2013 7:01 am    Post subject: Reply with quote

keenblade wrote:
zmedico wrote:
I do all of my big updates in a chroot (a btrfs snapshot of my root fs), so I never have to worry about stuff like that.

I am very interested in this. Do you have a tutorial or doc about doing updates in chroot with btrfs snapshot?


No, but it's pretty simple to do once you've learned how to use btrfs. What I do is create a subvolume for my root fs, and set that as the default subvolume. The default subvolume is the one that is mounted by default. You can also use rootflags=subvol=foo in your kernel parameters to choose a different subvolume at boot time if necessary. To access all of the subvolumes, you just mount the device somewhere with mount option subvol=/ (btrfs allows you to mount the same device on multiple mount points simultaneously).

keenblade wrote:
Is btrfs matured enough to be used as main fs?


It's very mature and stable for common use cases. I have noticed some mis-configurations that make it unstable, leading to a hung system, but typically not data loss. The problems I've experienced are limited to two specific mis-configurations:

  • when the "discard" mount option is enabled for a device that does not support TRIM
  • when an extremely large filesystem (1TB or more) is mounted with "space_cache" mount option _not_ enabled


As long as I avoid these 2 misconfigurations, it's very reliable for me. I trust it with all my data (of course I do backups).
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keenblade
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PostPosted: Tue Jul 02, 2013 10:14 pm    Post subject: Reply with quote

Zac, thanks again. I'll play with btrfs and chroot on a test machine.
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steveL
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PostPosted: Wed Jul 03, 2013 7:50 am    Post subject: Reply with quote

Nice one zmedico. Added to favourite tips page (under Advanced Usage ;)
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