Hey all I've been trying to figure out why my system (home desktop) is taking so long to boot. Systemd-analyze tells me that my root filesystem partition (which is btrfs) takes ~11 seconds to become active, and I'm curious as to why and whether or not I can optimise this.
The primary disk has 4 partitions: a EFI/BIOS boot partion (for GRUB); a /boot partition (ext4); a swap partition; and the root partition. The disk itself is not particularly large (320 GB), and I'm using subvolumes to emulate partitions in btrfs. There are three top-level subvolumes, for /, /home, and /var, none of which have quotas, and I'm not at present doing snapshots because I backup every day to an external drive formatted with ext4. I've got a second 5 TB drive for multimedia that is also btrfs, but it only takes ~3 seconds to come online. I had been using a number of bind mounts from the multimedia drive to my home folder, so that $HOME/music and $HOME/videos point to the library, and replacing them with symlinks reduced the time by ~3 seconds, but it still doesn't account for why the root device takes so long. My fstab contains the following: # /dev/sdc4 LABEL=filesystem UUID=4ec80601-4799-4fa8-a711-0171c180f25b / btrfs rw,noatime,space_cache,autodefrag,subvol=rootvol 0 0 # /dev/sdc4 LABEL=filesystem UUID=4ec80601-4799-4fa8-a711-0171c180f25b /home btrfs rw,noatime,space_cache,autodefrag,subvol=homevol 0 0 # /dev/sdc4 LABEL=filesystem UUID=4ec80601-4799-4fa8-a711-0171c180f25b /var btrfs rw,noatime,space_cache,autodefrag,subvol=var 0 0 # /dev/sdc2 LABEL=boot UUID=ca281471-0aac-4090-8660-33b8b9fee5a3 /boot ext4 rw,relatime,data=ordered 0 2 # /dev/sdb1 LABEL=library UUID=97226949-50e0-4a78-899e-863f5b436bcc /mnt/library btrfs rw,noatime,space_cache,autodefrag 0 0 Can anyone offer any insights or advice?
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