Total fs size does not match with the actual size of the setup
The btrfs setup only have one device of size 7 GiB but when I run df, the total size shown is 15 GiB. Running btrfs --repair displays an error cache and super generation don't match, space cache will be invalidated. How can I correct the total fs size as shown in df? -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Total fs size does not match with the actual size of the setup
On Mon, Oct 28, 2013 at 04:09:18AM +0800, Lester B wrote: The btrfs setup only have one device of size 7 GiB but when I run df, the total size shown is 15 GiB. Running btrfs --repair I'd recommend not running btrfs check --repair unless you really know what you're doing, or you've checked with someone knowledgable and they say you should try it. On a non-broken filesystem (as here), it's probably OK, though. displays an error cache and super generation don't match, space cache will be invalidated. This is harmless. How can I correct the total fs size as shown in df? You can't. It's an artefact of the fact that you've got a RAID-1 (or RAID-10, or --mixed and DUP) filesystem, and that the standard kernel interface for df doesn't allow us to report the correct figures -- see [1] (and the subsequent entry as well) for a more detailed description. Hugo. [1] https://btrfs.wiki.kernel.org/index.php/FAQ#Why_does_df_show_incorrect_free_space_for_my_RAID_volume.3F -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Nothing right in my left brain. Nothing left in --- my right brain. signature.asc Description: Digital signature
Re: Total fs size does not match with the actual size of the setup
2013/10/28 Hugo Mills h...@carfax.org.uk: On Mon, Oct 28, 2013 at 04:09:18AM +0800, Lester B wrote: The btrfs setup only have one device of size 7 GiB but when I run df, the total size shown is 15 GiB. Running btrfs --repair I'd recommend not running btrfs check --repair unless you really know what you're doing, or you've checked with someone knowledgable and they say you should try it. On a non-broken filesystem (as here), it's probably OK, though. displays an error cache and super generation don't match, space cache will be invalidated. This is harmless. How can I correct the total fs size as shown in df? You can't. It's an artefact of the fact that you've got a RAID-1 (or RAID-10, or --mixed and DUP) filesystem, and that the standard kernel interface for df doesn't allow us to report the correct figures -- see [1] (and the subsequent entry as well) for a more detailed description. Hugo. [1] https://btrfs.wiki.kernel.org/index.php/FAQ#Why_does_df_show_incorrect_free_space_for_my_RAID_volume.3F -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Nothing right in my left brain. Nothing left in --- my right brain. But my setup is a simple one without any RAID levels or other things so at least df size column should show the actual size of my setup. -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Total fs size does not match with the actual size of the setup
On 2013/10/27 10:27 PM, Lester B wrote: 2013/10/28 Hugo Mills h...@carfax.org.uk: On Mon, Oct 28, 2013 at 04:09:18AM +0800, Lester B wrote: The btrfs setup only have one device of size 7 GiB but when I run df, the total size shown is 15 GiB. Running btrfs --repair I'd recommend not running btrfs check --repair unless you really know what you're doing, or you've checked with someone knowledgable and they say you should try it. On a non-broken filesystem (as here), it's probably OK, though. displays an error cache and super generation don't match, space cache will be invalidated. This is harmless. How can I correct the total fs size as shown in df? You can't. It's an artefact of the fact that you've got a RAID-1 (or RAID-10, or --mixed and DUP) filesystem, and that the standard kernel interface for df doesn't allow us to report the correct figures -- see [1] (and the subsequent entry as well) for a more detailed description. Hugo. [1] https://btrfs.wiki.kernel.org/index.php/FAQ#Why_does_df_show_incorrect_free_space_for_my_RAID_volume.3F -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Nothing right in my left brain. Nothing left in --- my right brain. But my setup is a simple one without any RAID levels or other things so at least df size column should show the actual size of my setup. Could you send us the output of the following?: btrfs fi df mountpoint (where mountpoint is the path where the btrfs is mounted.) -- __ Brendan Hide http://swiftspirit.co.za/ http://www.webafrica.co.za/?AFF1E97 -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Total fs size does not match with the actual size of the setup
sudo btrfs fi df mountpoint Data: total=5.62GB, used=4.96GB System: total=32.00MB, used=4.00KB Metadata: total=512.00MB, used=288.70MB -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
