Some Linux distributions started adding btrfs support in their installers. Unfortunately, you can''t specify your own mkfs.btrfs parameters, so the best an installer can produce is a btrfs filesystem made on one partition. Is it possible to turn a 1-disk (partition) btrfs filesystem into RAID-1? Suppose you have your / btrfs filesystem on /dev/vda3, and there is a free /dev/vdb3 partition which you would like to use to have btrfs RAID-1 - what are the options to set it up like this? A command like: btrfs device add /dev/vdb3 / will, I suppose, simply make RAID-0 and double your available storage - are there any options to make it RAID-1? Or, will it be RAID-1 after I do: btrfs filesystem balance / ? -- Tomasz Chmielewski http://wpkg.org -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi, > Is it possible to turn a 1-disk (partition) btrfs filesystem into > RAID-1? Not yet, but I''m pretty sure it''s on the roadmap. - Chris. -- Chris Ball <cjb@laptop.org> One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 11/10/2010 19:06, Chris Ball wrote:> Hi, > > > Is it possible to turn a 1-disk (partition) btrfs filesystem into > > RAID-1? > > Not yet, but I''m pretty sure it''s on the roadmap. > > - Chris.Is it possible to view the raid levels of data and meta data for an existing btrfs filesystem? It''s easy to pick them when creating the system, but I couldn''t find any way to view them afterwards. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Oct 12, 2010 at 11:32:07AM +0200, David Brown wrote:> On 11/10/2010 19:06, Chris Ball wrote: > >Hi, > > > > > Is it possible to turn a 1-disk (partition) btrfs filesystem into > > > RAID-1? > > > >Not yet, but I''m pretty sure it''s on the roadmap. > > > >- Chris. > > Is it possible to view the raid levels of data and meta data for an > existing btrfs filesystem? It''s easy to pick them when creating the > system, but I couldn''t find any way to view them afterwards."btrfs f df" will show them, except for few kernel releases when the ioctl() was broken. -- Tomasz Torcz 72->| 80->| xmpp: zdzichubg@chrome.pl 72->| 80->| -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Oct 12, 2010 at 11:34:31AM +0200, Tomasz Torcz wrote:> On Tue, Oct 12, 2010 at 11:32:07AM +0200, David Brown wrote: > > Is it possible to view the raid levels of data and meta data for an > > existing btrfs filesystem? It''s easy to pick them when creating the > > system, but I couldn''t find any way to view them afterwards. > > "btrfs f df" will show them, except for few kernel releases when the ioctl() > was broken.Umm... hrm@vlad:~ $ sudo btrfs fi df /mnt/ [sudo] password for hrm: Data: total=303.01GB, used=302.16GB Metadata: total=3.01GB, used=476.77MB System: total=11.88MB, used=36.00KB This is the latest btrfs git kernel and tools. What should I be seeing here? Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk == PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- emacs: Emacs Makes A Computer Slow. ---
On Tue, Oct 12, 2010 at 10:49:35AM +0100, Hugo Mills wrote:> On Tue, Oct 12, 2010 at 11:34:31AM +0200, Tomasz Torcz wrote: > > On Tue, Oct 12, 2010 at 11:32:07AM +0200, David Brown wrote: > > > Is it possible to view the raid levels of data and meta data for an > > > existing btrfs filesystem? It''s easy to pick them when creating the > > > system, but I couldn''t find any way to view them afterwards. > > > > "btrfs f df" will show them, except for few kernel releases when the ioctl() > > was broken. > > Umm... > > hrm@vlad:~ $ sudo btrfs fi df /mnt/ > [sudo] password for hrm: > Data: total=303.01GB, used=302.16GB > Metadata: total=3.01GB, used=476.77MB > System: total=11.88MB, used=36.00KB > > This is the latest btrfs git kernel and tools. What should I be > seeing here?Do you have this patch applied? http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg06239.html -- Tomasz Torcz 72->| 80->| xmpp: zdzichubg@chrome.pl 72->| 80->| -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 12/10/2010 11:34, Tomasz Torcz wrote:> On Tue, Oct 12, 2010 at 11:32:07AM +0200, David Brown wrote: >> On 11/10/2010 19:06, Chris Ball wrote: >>> Hi, >>> >>> > Is it possible to turn a 1-disk (partition) btrfs filesystem into >>> > RAID-1? >>> >>> Not yet, but I''m pretty sure it''s on the roadmap. >>> >>> - Chris. >> >> Is it possible to view the raid levels of data and meta data for an >> existing btrfs filesystem? It''s easy to pick them when creating the >> system, but I couldn''t find any way to view them afterwards. > > "btrfs f df" will show them, except for few kernel releases when the ioctl() > was broken. >I guess it''s time to update my System Rescue CD to a version with the btrfs command rather than just btrfsctl etc. Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html