我最近擦拭了我的盒子并安装了我喜欢并且很棒的 20.10！这一次我决定我想生活在边缘并使用实验性的 zfs 支持，但是在安装包和更新一段时间后，我现在有一个奇怪的问题，我的引导 zpool 太满了。
每当我在软件更新程序中点击“立即更新”时，我都会收到如下消息：
The upgrade needs a total of 254 M free space on disk '/boot'. Please free at least an additional 194 M of disk space on '/boot'. You can remove old kernels using 'sudo apt autoremove', and you could also set COMPRESS=xz in /etc/initramfs-tools/initramfs.conf to reduce the size of your initramfs.
我运行sudo apt autoremove了它并没有删除任何内容，我犹豫要更改我的 initramfs 上的压缩，因为这更像是对可能的较低问题的补丁（也许我错了哈哈）。
我仍然可以手动升级，sudo apt update && sudo apt upgrade但每次都会收到此错误：
ERROR couldn't save system state: Minimum free space to take a snapshot and preserve ZFS performance is 20%.
当我跑步时，zpool list我得到：
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
bpool 1.88G 1.69G 185M - - 47% 90% 1.00x ONLINE -
rpool 460G 165G 295G - - 10% 35% 1.00x ONLINE -
所以我的引导池容量为 90%...
我还尝试zsysctl service gc -a删除快照，但这似乎并没有改变 bpool 的使用...
所以也许我需要改变我的 bpool 分配大小？我怎么做？
当我升级/安装时，我也遇到了一些奇怪的 initramfs 故障，但我不确定这是否相关？
Setting up initramfs-tools (0.137ubuntu12) ...
update-initramfs: deferring update (trigger activated)
Setting up linux-firmware (1.190.1+system76~1605123765~20.10~3894207) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-29-generic
I: The initramfs will attempt to resume from /dev/nvme0n1p2
I: (UUID=05a735a7-9e82-494e-be9b-171b1c132af5)
I: Set the RESUME variable to override this.
Error 24 : Write error : cannot write compressed block
E: mkinitramfs failure cpio 141 lz4 -9 -l 24
update-initramfs: failed for /boot/initrd.img-5.8.0-29-generic with 1.
dpkg: error processing package linux-firmware (--configure):
installed linux-firmware package post-installation script subprocess returned error exit status 1
Processing triggers for initramfs-tools (0.137ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-29-generic
I: The initramfs will attempt to resume from /dev/nvme0n1p2
I: (UUID=05a735a7-9e82-494e-be9b-171b1c132af5)
I: Set the RESUME variable to override this.
Error 24 : Write error : cannot write compressed block
E: mkinitramfs failure cpio 141 lz4 -9 -l 24
update-initramfs: failed for /boot/initrd.img-5.8.0-29-generic with 1.
dpkg: error processing package initramfs-tools (--configure):
installed initramfs-tools package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
linux-firmware
initramfs-tools
ZSys is adding automatic system snapshot to GRUB menu
E: Sub-process /usr/bin/dpkg returned an error code (1)
runningzfs list -t snapshot显示了 bpool 的一堆快照：
NAME USED AVAIL REFER MOUNTPOINT
bpool/BOOT/ubuntu_fjp6bn@autozsys_z4aetj 72K - 237M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_mtxh3h 72K - 237M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_72y92u 105M - 357M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_lo8d22 85.2M - 337M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_y7ihca 104M - 336M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_qs6vz5 85.2M - 318M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_cyg6vx 72K - 337M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_r6e64v 56K - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_nrhjqi 56K - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_kgfl6b 104M - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_nw3nk0 85.1M - 199M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_m1b6l9 104M - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_hnt98o 85.1M - 199M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_rj8ttq 64K - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_da1f4s 0B - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_ljdo3n 0B - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_danwfz 0B - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_4sjbka 104M - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_gl3ru4 0B - 218M -
bpool/BOOT/ubuntu_fjp6bn@autozsys_tdbgin 0B - 218M -
rpool/ROOT/ubuntu_fjp6bn@autozsys_z4aetj 71.7M - 5.10G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_mtxh3h 217M - 5.25G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_72y92u 33.3M - 5.43G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_lo8d22 30.2M - 5.30G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_y7ihca 224M - 5.42G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_qs6vz5 27.8M - 5.23G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_cyg6vx 56.3M - 5.51G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_r6e64v 56.6M - 5.29G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_nrhjqi 30.6M - 5.29G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_kgfl6b 7.01M - 5.25G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_nw3nk0 29.6M - 5.17G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_m1b6l9 222M - 5.32G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_hnt98o 27.7M - 5.13G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_rj8ttq 26.2M - 5.17G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_da1f4s 155M - 5.29G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_ljdo3n 24.9M - 5.61G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_danwfz 181M - 5.74G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_4sjbka 498M - 5.66G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_gl3ru4 0B - 5.92G -
rpool/ROOT/ubuntu_fjp6bn@autozsys_tdbgin 0B - 5.92G -
但是我对 zfs 或 zsys 不够坚定，不知道我是否可以只销毁快照？