On Thu, 2014-03-13 at 00:05 -0600, Chris Murphy wrote: > On Mar 12, 2014, at 7:22 PM, Chris Murphy <li...@colorremedies.com> wrote: > > > I think you've stumbled into a bug. Since Btrfs directly supports multiple > > devices, it's like LVM or raid in this respect, and for LVM and RAID, > > anaconda might be eager to configure multiple device layouts this way. > > > > So I'm going to bet dollars to donuts this is a Btrfs raid0 volume. > > I just tried this with Rawhide, and it is rather easy to create a multiple > device Btrfs volume and maybe not realize it. The resulting volume uses data > profile single, metadata profile raid1. This can be confirmed with: > > btrfs fi df /
$ sudo btrfs fi df / ERROR: couldn't get space info - Inappropriate ioctl for device ERROR: get_df failed Inappropriate ioctl for device Note that / is ext4, not btrfs. > Data profile single allocations in 1GB chunks to the block device (partition) > with the most free space. When free space remaining among all devices is the > same, it round robin allocates in 1GB increments. The metadata being raid1 > means both SSD and HDD have a copy of the file system. > > The way data profile single works is it allocates in 1GB chunks to the block > device (partition) that has the most free space, until both have the same > free space remaining, and then it alternates between them in 1GB chunks. The > metadata however is raid1, so the SSD and the hard drive each have a copy of > the file system. > > So if yours is configured this way, it's probably not critical to change it. > The metadata going to the SSD isn't much, and since the HDD has much more > space probably all data chunks are allocated on it for the near/medium term. > But conversion to single device Btrfs is straightforward, three btrfs > commands will do it. And then some extras to reclaim the space on the SSD for > /var or / or whatever. I'm willing to try it if you give me step-by-step instructions. I have daily backups on a NAS so I can recover from disasters. poc -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
