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| From: | "Stefan G. Weichinger" <lists@×××××.at> | ||
|---|---|---|---|
| To: | gentoo-user@l.g.o | ||
| Subject: | Re: [gentoo-user] btrfs: subvol without compression | ||
| Date: | Mon, 07 Jul 2014 12:46:59 | ||
| Message-Id: | 53BA96B8.2000303@xunil.at | ||
| In Reply to: | Re: [gentoo-user] btrfs: subvol without compression by Marc Joliet |
||
| 1 | Am 20.06.2014 12:07, schrieb Marc Joliet: |
| 2 | |
| 3 | > From my own google search, at least up to 2011 per-subvolume |
| 4 | > compression settings were not possible. Then, after subsequently |
| 5 | > searching on the btrfs wiki for a while, I finally found an answer: |
| 6 | > no. See this FAQ entry: |
| 7 | > |
| 8 | > https://btrfs.wiki.kernel.org/index.php/FAQ#Can_I_mount_subvolumes_with_different_mount_options.3F |
| 9 | > |
| 10 | > [...] |
| 11 | |
| 12 | This seems to be the same for the option nodatacow. |
| 13 | |
| 14 | I wanted to test this with VM-images in a separate subvolume, and with |
| 15 | this script: |
| 16 | |
| 17 | https://github.com/stsquad/scripts/blob/master/uncow.py |
| 18 | |
| 19 | It was mentioned here: |
| 20 | |
| 21 | https://btrfs.wiki.kernel.org/index.php/FAQ#Can_copy-on-write_be_turned_off_for_data_blocks.3F |
| 22 | |
| 23 | Does somebody already have experience with turning off COW for |
| 24 | specific files like VM images? |
| 25 | |
| 26 | I would like to take 2 demo VMs with me on my thinkpad, and there I |
| 27 | don't have that much flexibility to add another hdd w/ ext4 or something. |
| 28 | |
| 29 | As far as I have seen so far, for demoing the performance isn't too |
| 30 | bad anyway. |
| 31 | |
| 32 | Stefan |