On 01/08/17, E V wrote: > In general I think btrfs takes time proportional to the size of your > metadata to mount. Bigger and/or fragmented metadata leads to longer > mount times. My big backup fs with >300GB of metadata takes over > 20minutes to mount, and that's with the space tree which is > significantly faster then space cache v1. > Hmm my raid1 doesn't seem near to full or has a significant Metadata so I don't I'm on this case: # btrfs fi show /media/raid1/ Label: 'raid1' uuid: c9db91e6-0ba8-4ae6-b471-8fd4ff7ee72d Total devices 2 FS bytes used 516.18GiB devid 1 size 931.51GiB used 518.03GiB path /dev/sdd devid 2 size 931.51GiB used 518.03GiB path /dev/sde
# btrfs fi df /media/raid1/ Data, RAID1: total=513.00GiB, used=512.21GiB System, RAID1: total=32.00MiB, used=112.00KiB Metadata, RAID1: total=5.00GiB, used=3.97GiB GlobalReserve, single: total=512.00MiB, used=0.00B I tried the space_cache=v2 just to see if it would do any difference but nothing changed # cat /etc/fstab | grep raid1 UUID=c9db91e6-0ba8-4ae6-b471-8fd4ff7ee72d /media/raid1 btrfs rw,noatime,compress=lzo,space_cache=v2 0 0 # time umount /media/raid1 && time mount /media/raid1/ real 0m0.807s user 0m0.237s sys 0m0.441s real 0m5.494s user 0m0.618s sys 0m0.116s I did a couple of rebalances on metadata and data and it improved a bit: # btrfs balance start -musage=100 /media/raid1/ # btrfs balance start -dusage=10 /media/raid1/ [.. incremental dusage 10 -> 95] # btrfs balance start -dusage=95 /media/raid1 Down to 3.7 sec # time umount /media/raid1 && time mount /media/raid1/ real 0m0.807s user 0m0.237s sys 0m0.441s real 0m3.790s user 0m0.430s sys 0m0.031s I think maybe the next step is to disable compression if I want to mount it faster. Is this normal for BTRFS that performance would degrade after some time? Regards, -- Leonidas Spyropoulos A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? -- 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