Hi everyone,
I''m running kernel 2.6.32-0.65.rc8.git5.fc13.x86_64. And I ran
"btrfs-vol -b", however for 10G of data I still have 9G of metadata!
How do I fix this ?
[root@matrix ~]# btrfs-vol -b /
ioctl returns 0
You have mail in /var/spool/mail/root
[root@matrix ~]# btrfs-show
failed to read /dev/sr0
Label: none uuid: 06b0d069-b1cb-48c4-b26f-c5088a2360d2
Total devices 1 FS bytes used 10.43GB
devid 1 size 25.72GB used 19.02GB path /dev/dm-1
Btrfs Btrfs v0.19
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On Sun, Dec 06, 2009 at 10:50:45AM +0200, Ahmed Kamal wrote:> Hi everyone, > > I''m running kernel 2.6.32-0.65.rc8.git5.fc13.x86_64. And I ran > "btrfs-vol -b", however for 10G of data I still have 9G of metadata! > How do I fix this ? > > [root@matrix ~]# btrfs-vol -b / > ioctl returns 0 > You have mail in /var/spool/mail/root > [root@matrix ~]# btrfs-show > failed to read /dev/sr0 > Label: none uuid: 06b0d069-b1cb-48c4-b26f-c5088a2360d2 > Total devices 1 FS bytes used 10.43GB > devid 1 size 25.72GB used 19.02GB path /dev/dm-1Used means something different here than it does to df. It just means that we''ve preallocated 19GB of space on the drive as either data or metadata, but it doesn''t say if that space is actively used by the FS yet or not. In other words, btrfs-show could tell you that 19GB has been used, but df could say that 0 bytes are in use in the FS. This is because btrfs allocates from devices to create chunks at a specific raid level and then does suballocations inside those chunks. -chris -- 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
> In other words, btrfs-show could tell you that 19GB has been used, but > df could say that 0 bytes are in use in the FS.Thanks Chris for the clarification. So despite saying 19G are used, I shouldn''t be worried about running out of disk space, since these are just pre-allocated areas. Perhaps btrfs-show should show how much areas are really used, besides how much are just pre-allocated. The thing is, I keep monitoring that number to avoid ENOSPC and now I know that number is not accurate. Thanks for the stellar work Regards -- 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