On Tue, Oct 30, 2012 at 3:40 PM, ching <lschin...@gmail.com> wrote: > On 10/30/2012 08:17 PM, cwillu wrote: >>>> If there is a lot of small files, then the size of metadata will be >>>> undesirable due to deduplication >>> >>> Yes, that is a fact, but if that really matters depends on the use-case >>> (e.g., the small files to large files ratio, ...). But as btrfs is designed >>> explicitly as a general purpose file system, you usually want the good >>> performance instead of the better disk-usage (especially as disk space isn't >>> expensive anymore). >> As I understand it, in basically all cases the total storage used by >> inlining will be _smaller_, as the allocation doesn't need to be >> aligned to the sector size. >> > > if i have 10G small files in total, then it will consume 20G by default. > > ching
No. No they will not. As I already explained. root@repository:/mnt$ mount ~/inline /mnt -o loop root@repository:/mnt$ mount ~/inline /mnt2 -o loop,max_inline=0 root@repository:/mnt$ mount /dev/loop0 on /mnt type btrfs (rw) /dev/loop1 on /mnt2 type btrfs (rw,max_inline=0) root@repository:/mnt$ time for x in {1..243854}; do echo "some stuff" > /mnt/$x; done real 1m5.447s user 0m38.422s sys 0m18.493s root@repository:/mnt$ time for x in {1..243854}; do echo "some stuff" > /mnt2/$x; done real 1m49.880s user 0m40.379s sys 0m26.210s root@repository:/mnt$ df /mnt /mnt2 Filesystem 1K-blocks Used Available Use% Mounted on /dev/loop0 10485760 266952 8359680 4% /mnt /dev/loop1 10485760 1311620 7384236 16% /mnt2 root@repository:/mnt$ btrfs fi df /mnt Data: total=1.01GB, used=256.00KB System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=1.00GB, used=130.22MB Metadata: total=8.00MB, used=0.00 root@repository:/mnt$ btrfs fi df /mnt2 Data: total=2.01GB, used=953.05MB System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=1.00GB, used=164.03MB Metadata: total=8.00MB, used=0.00 root@repository:/mnt$ btrfs fi show Label: none uuid: e5440337-9f44-4b2d-9889-80ab0ab8f245 Total devices 1 FS bytes used 130.47MB devid 1 size 10.00GB used 3.04GB path /dev/loop0 Label: none uuid: cfcc4149-3102-465d-89b8-0a6bb6a4749a Total devices 1 FS bytes used 1.09GB devid 1 size 10.00GB used 4.04GB path /dev/loop1 Btrfs Btrfs v0.19 Any questions? -- 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