ZFS 数据集在重新启动时消失

Question

我已经在 Centos 7 中安装了 ZFS(0.6.5) 并且我还创建了一个 zpool，除了我的数据集在重新启动时消失之外，一切正常。
我一直在尝试借助各种在线资源和博客来调试此问题，但无法获得理想的结果。
重新启动后，当我发出zfs list命令时，我得到"no datasets available"，并zpool list给出了"no pools available" 经过大量在线研究，我可以通过使用zpool import -c cachefile手动导入缓存文件来使其工作，但是我仍然必须在重新启动之前运行zpool set cachefile=/etc/zfs/zpool.cache Pool以便在重新启动后稍后导入它。

这是什么systemctl status zfs-import-cache 好像，

zfs-import-cache.service - Import ZFS pools by cache file Loaded: loaded (/usr/lib/systemd/system/zfs-import-cache.service; static) Active: inactive (dead)

cat /etc/sysconfig/zfs

# ZoL userland configuration.

# Run `zfs mount -a` during system start?
ZFS_MOUNT='yes'

# Run `zfs unmount -a` during system stop?
ZFS_UNMOUNT='yes'

# Run `zfs share -a` during system start?
# nb: The shareiscsi, sharenfs, and sharesmb dataset properties.
ZFS_SHARE='yes'

# Run `zfs unshare -a` during system stop?
ZFS_UNSHARE='yes'

# Specify specific path(s) to look for device nodes and/or links for the
# pool import(s). See zpool(8) for more information about this variable.
# It supersedes the old USE_DISK_BY_ID which indicated that it would only
# try '/dev/disk/by-id'.
# The old variable will still work in the code, but is deprecated.
#ZPOOL_IMPORT_PATH="/dev/disk/by-vdev:/dev/disk/by-id"

# Should the datasets be mounted verbosely?
# A mount counter will be used when mounting if set to 'yes'.
VERBOSE_MOUNT='no'

# Should we allow overlay mounts?
# This is standard in Linux, but not ZFS which comes from Solaris where this
# is not allowed).
DO_OVERLAY_MOUNTS='no'

# Any additional option to the 'zfs mount' command line?
# Include '-o' for each option wanted.
MOUNT_EXTRA_OPTIONS=""

# Build kernel modules with the --enable-debug switch?
# Only applicable for Debian GNU/Linux {dkms,initramfs}.
ZFS_DKMS_ENABLE_DEBUG='no'

# Build kernel modules with the --enable-debug-dmu-tx switch?
# Only applicable for Debian GNU/Linux {dkms,initramfs}.
ZFS_DKMS_ENABLE_DEBUG_DMU_TX='no'

# Keep debugging symbols in kernel modules?
# Only applicable for Debian GNU/Linux {dkms,initramfs}.
ZFS_DKMS_DISABLE_STRIP='no'

# Wait for this many seconds in the initrd pre_mountroot?
# This delays startup and should be '0' on most systems.
# Only applicable for Debian GNU/Linux {dkms,initramfs}.
ZFS_INITRD_PRE_MOUNTROOT_SLEEP='0'

# Wait for this many seconds in the initrd mountroot?
# This delays startup and should be '0' on most systems. This might help on
# systems which have their ZFS root on a USB disk that takes just a little
# longer to be available
# Only applicable for Debian GNU/Linux {dkms,initramfs}.
ZFS_INITRD_POST_MODPROBE_SLEEP='0'

# List of additional datasets to mount after the root dataset is mounted?
#
# The init script will use the mountpoint specified in the 'mountpoint'
# property value in the dataset to determine where it should be mounted.
#
# This is a space separated list, and will be mounted in the order specified,
# so if one filesystem depends on a previous mountpoint, make sure to put
# them in the right order.
#
# It is not necessary to add filesystems below the root fs here. It is
# taken care of by the initrd script automatically. These are only for
# additional filesystems needed. Such as /opt, /usr/local which is not
# located under the root fs.
# Example: If root FS is 'rpool/ROOT/rootfs', this would make sense.
#ZFS_INITRD_ADDITIONAL_DATASETS="rpool/ROOT/usr rpool/ROOT/var"

# List of pools that should NOT be imported at boot?
# This is a space separated list.
#ZFS_POOL_EXCEPTIONS="test2"

# Optional arguments for the ZFS Event Daemon (ZED).
# See zed(8) for more information on available options.
#ZED_ARGS="-M"

我不确定这是否是一个已知问题，如果是，是否有任何解决方法？也许是一种在重启后保留我的数据集的简单方法，最好是没有缓存文件的开销。

Answer 1

好的，所以池在那里，这意味着问题出在您的 zfs.cache 上，它不是持久的，这就是为什么在您重新启动时它会丢失其配置。我建议做的是运行：

      zpool import zfsPool 
      zpool list 

并检查它是否可用。重新启动服务器并查看它是否恢复，如果没有，则执行相同的步骤并运行：

      zpool scrub

只是为了确保您的游泳池等一切正常。

请同时发布以下内容：

      /etc/default/zfs.conf
      /etc/init/zpool-import.conf

或者，如果您正在寻找解决此问题的方法，您当然可以将其设置如下。

将值从 1 更改为 0：

    /etc/init/zpool-import.conf

并将以下内容添加到您的 /etc/rc.local 中：

    zfs mount -a

这样就行了。

Answer 2

请确保启用了 zfs 服务（目标）。这就是在启动/关闭时处理池导入/导出的内容。

zfs.target loaded active active ZFS startup target

你永远不应该为此而挣扎。如果有机会，请在 zfs 发行版上运行更新，因为我知道在过去的几个版本中，初创公司的服务有所改进：

[root@zfs2 ~]# rpm -qi zfs
Name        : zfs
Version     : 0.6.5.2
Release     : 1.el7.centos