On 2016/06/21 8:30, Marc Grondin wrote: > Hi everyone, > > > I have a btrfs filesystem ontop of a 4x1tb mdraid raid5 array and I've > been getting confusing output on metadata usage. Seems that even tho > both data and metadata are in single profile metadata is reporting > double the space(as if it was in dupe profile) > > > > root@thebeach /h/marcg> uname -a > Linux thebeach 4.6.2-gentoo-GMAN #1 SMP Sat Jun 11 22:32:27 ADT 2016 > x86_64 Intel(R) Core(TM) i5-2320 CPU @ 3.00GHz GenuineIntel GNU/Linux > root@thebeach /h/marcg> btrfs --version > btrfs-progs v4.5.3 > root@thebeach /h/marcg> btrfs fi us /media/Storage2 > Overall: > Device size: 2.73TiB > Device allocated: 1.71TiB > Device unallocated: 1.02TiB > Device missing: 0.00B > Used: 1.38TiB > Free (estimated): 1.34TiB (min: 1.34TiB) > Data ratio: 1.00 > Metadata ratio: 1.00 > Global reserve: 512.00MiB (used: 0.00B) > > > Data,single: Size:1.71TiB, Used:1.38TiB > /dev/mapper/storage2 1.71TiB > > > Metadata,single: Size:3.00GiB, Used:1.53GiB > /dev/mapper/storage2 3.00GiB > > > System,single: Size:32.00MiB, Used:208.00KiB > /dev/mapper/storage2 32.00MiB > > > Unallocated: > /dev/mapper/storage2 1.02TiB > root@thebeach /h/marcg> btrfs fi df /media/Storage2 > Data, single: total=1.71TiB, used=1.38TiB > System, single: total=32.00MiB, used=208.00KiB > Metadata, single: total=3.00GiB, used=1.53GiB > GlobalReserve, single: total=512.00MiB, used=0.00B > root@thebeach /h/marcg> > > > I'm not sure if this is known and if it's btrfs-progs related or if it > is actually allocating that space. Could you tell me the location where you think metadata is reporting double the space? from fi us: > Metadata,single: Size:3.00GiB, Used:1.53GiB > /dev/mapper/storage2 3.00GiB from fi df: > Metadata,single: Size:3.00GiB, Used:1.53GiB > /dev/mapper/storage2 3.00GiB As far as I can see, Btrfs just allocates 3.00 GiB from /dev/mapper/storage2, Metadata,single size is the same as it (not double), and 1.53 GiB is used. The following is in my case where data is single and meta is dup. from fi us: Metadata,DUP: Size:384.00MiB, Used:221.36MiB /dev/vda3 768.00MiB from fi df: Metadata, DUP: total=384.00MiB, used=221.36MiB Here Btrfs allocates 768.0MiB from /dev/vda3 and it's twice as large as the size of Metadata,DUP(384.00MiB). I guess it means that "metadata is reporting double the space" as you said and your case it not the case. CMIIW. Thanks, Satoru > > > Thank you for reading. > > > Marc > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
