debian-stretch - 重新启动后，DRBD 出现 Connected Diskless/Diskless 状态

Question

在无人注意的断电后，面临重大问题，每次重新启动 DBRB 想出连接无盘/无盘地位。

主要问题:

• dump-md response: Found meta data is "unclean"
• apply-al command terminated with exit code 20 with message open(/dev/nvme0n1p1) failed: Device or resource busy
• drbd resource config cannot be opened exclusive.

关于环境:

这个 drbd 资源通常用作 lvm 的块存储，它被配置为 proxmox ve 5.3-8 集群的(共享 lvm)存储。在 drbd 块设备之上配置了 lvm，但在 drbd 主机 lvm config 上，drbd 服务下面的设备(/dev/nvme0n1p1)被过滤掉(/etc/lvm/lvm.conf 如下所示)

drbd下的设备是PCIe NVMe设备

它有一些由 systemctl 显示的额外属性:

root@pmx0:~# systemctl list-units | grep nvme
sys-devices-pci0000:00-0000:00:01.1-0000:0c:00.0-nvme-nvme0-nvme0n1-nvme0n1p1.device             loaded active     plugged   /sys/devices/pci0000:00/0000:00:01.1/0000:0c:00.0/nvme/nvme0/nvme0n1/nvme0n1p1
sys-devices-pci0000:00-0000:00:01.1-0000:0c:00.0-nvme-nvme0-nvme0n1.device                       loaded active     plugged   /sys/devices/pci0000:00/0000:00:01.1/0000:0c:00.0/nvme/nvme0/nvme0n1

sytemctl 中列出的其他存储设备普通 SAS 磁盘看起来有点不同:

root@pmx0:~# systemctl list-units | grep sdb
sys-devices-pci0000:00-0000:00:01.0-0000:0b:00.0-host0-target0:2:1-0:2:1:0-block-sdb-sdb1.device loaded active     plugged   PERC_H710 1
sys-devices-pci0000:00-0000:00:01.0-0000:0b:00.0-host0-target0:2:1-0:2:1:0-block-sdb-sdb2.device loaded active     plugged   PERC_H710 2
sys-devices-pci0000:00-0000:00:01.0-0000:0b:00.0-host0-target0:2:1-0:2:1:0-block-sdb.device      loaded active     plugged   PERC_H710

使用 ls 列出 NVMe/sys/devices/..

root@pmx0:~# ls /sys/devices/pci0000:00/0000:00:01.1/0000:0c:00.0/nvme/nvme0/nvme0n1/nvme0n1p1
alignment_offset  dev  discard_alignment  holders  inflight  partition  power  ro  size  start  stat  subsystem  trace  uevent

事情并非如此:

再次重启没用

drbd 服务重启没用

drbdadm detach/disconnect/attach/service restart 没用

未在这些 drbd 节点上配置 nfs-kernel-server 服务(因此无法取消配置 nfs-server)

经过一番调查:

dump-md response: Found meta data is "unclean", please apply-al first apply-al command terminated with exit code 20 with this message: open(/dev/nvme0n1p1) failed: Device or resource busy

It seems that the problem is that this device (/dev/nvme0n1p1) used by my drbd resource config cannot be opened exclusive.

失败的 DRBD 命令:

root@pmx0:~# drbdadm attach r0
open(/dev/nvme0n1p1) failed: Device or resource busy
Operation canceled.
Command 'drbdmeta 0 v08 /dev/nvme0n1p1 internal apply-al' terminated with exit code 20
root@pmx0:~# drbdadm apply-al r0
open(/dev/nvme0n1p1) failed: Device or resource busy
Operation canceled.
Command 'drbdmeta 0 v08 /dev/nvme0n1p1 internal apply-al' terminated with exit code 20

root@pmx0:~# drbdadm dump-md r0
open(/dev/nvme0n1p1) failed: Device or resource busy

Exclusive open failed. Do it anyways?
[need to type 'yes' to confirm] yes

Found meta data is "unclean", please apply-al first
Command 'drbdmeta 0 v08 /dev/nvme0n1p1 internal dump-md' terminated with exit code 255

DRBD 服务状态/命令:

root@pmx0:~# drbd-overview
 0:r0/0  Connected Secondary/Secondary Diskless/Diskless
root@pmx0:~# drbdadm dstate r0
Diskless/Diskless
root@pmx0:~# drbdadm disconnect r0
root@pmx0:~# drbd-overview
 0:r0/0  . . .
root@pmx0:~# drbdadm detach r0
root@pmx0:~# drbd-overview
 0:r0/0  . . .

尝试重新附加资源 r0:

root@pmx0:~# drbdadm attach r0
open(/dev/nvme0n1p1) failed: Device or resource busy
Operation canceled.
Command 'drbdmeta 0 v08 /dev/nvme0n1p1 internal apply-al' terminated with exit code 20
root@pmx0:~# drbdadm apply-al r0
open(/dev/nvme0n1p1) failed: Device or resource busy
Operation canceled.
Command 'drbdmeta 0 v08 /dev/nvme0n1p1 internal apply-al' terminated with exit code 20

lsof，定影器零输出:

root@pmx0:~# lsof /dev/nvme0n1p1
root@pmx0:~# fuser /dev/nvme0n1p1
root@pmx0:~# fuser /dev/nvme0n1
root@pmx0:~# lsof /dev/nvme0n1

资源磁盘分区和 LVM 配置:

root@pmx0:~# fdisk -l /dev/nvme0n1
Disk /dev/nvme0n1: 1.9 TiB, 2048408248320 bytes, 4000797360 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x59762e31

Device         Boot Start        End    Sectors  Size Id Type
/dev/nvme0n1p1       2048 3825207295 3825205248  1.8T 83 Linux
root@pmx0:~# pvs
  PV             VG           Fmt  Attr PSize   PFree
  /dev/sdb2      pve          lvm2 a--  135.62g  16.00g
root@pmx0:~# vgs
  VG           #PV #LV #SN Attr   VSize   VFree
  pve            1   3   0 wz--n- 135.62g  16.00g
root@pmx0:~# lvs
  LV            VG           Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  data          pve          twi-a-tz--  75.87g             0.00   0.04
  root          pve          -wi-ao----  33.75g
  swap          pve          -wi-ao----   8.00g
root@pmx0:~# vi /etc/lvm/lvm.conf
root@pmx0:~# cat /etc/lvm/lvm.conf | grep nvm
        filter = [ "r|/dev/nvme0n1p1|", "a|/dev/sdb|", "a|sd.*|", "a|drbd.*|", "r|.*|" ]

DRBD 资源配置:

root@pmx0:~# cat /etc/drbd.d/r0.res
resource r0 {
        protocol C;
        startup {
                wfc-timeout  0;     # non-zero wfc-timeout can be dangerous (http://forum.proxmox.com/threads/3465-Is-it-safe-to-use-wfc-timeout-in-DRBD-configuration)
                degr-wfc-timeout 300;
        become-primary-on both;
        }
        net {
                cram-hmac-alg sha1;
                shared-secret "*********";
                allow-two-primaries;
                after-sb-0pri discard-zero-changes;
                after-sb-1pri discard-secondary;
                after-sb-2pri disconnect;
                #data-integrity-alg crc32c;     # has to be enabled only for test and disabled for production use (check man drbd.conf, section "NOTES ON DATA INTEGRITY")
        }
        on pmx0 {
                device /dev/drbd0;
                disk /dev/nvme0n1p1;
                address 10.0.20.15:7788;
                meta-disk internal;
        }
        on pmx1 {
                device /dev/drbd0;
                disk /dev/nvme0n1p1;
                address 10.0.20.16:7788;
                meta-disk internal;
        }
        disk {
                # no-disk-barrier and no-disk-flushes should be applied only to systems with non-volatile (battery backed) controller caches.
                # Follow links for more information:
                # http://www.drbd.org/users-guide-8.3/s-throughput-tuning.html#s-tune-disable-barriers
                # http://www.drbd.org/users-guide/s-throughput-tuning.html#s-tune-disable-barriers
                no-disk-barrier;
                no-disk-flushes;
        }
}

其他节点:

root@pmx1:~# drbd-overview
 0:r0/0  Connected Secondary/Secondary Diskless/Diskless

等等每个命令响应和配置都显示相同的节点 pmx0 上面...

Debian 和 DRBD 版本:

root@pmx0:~# uname -a
Linux pmx0 4.15.18-10-pve #1 SMP PVE 4.15.18-32 (Sat, 19 Jan 2019 10:09:37 +0100) x86_64 GNU/Linux
root@pmx0:~# cat /etc/debian_version
9.8
root@pmx0:~# dpkg --list| grep drbd
ii  drbd-utils                           8.9.10-2                       amd64        RAID 1 over TCP/IP for Linux (user utilities)
root@pmx0:~# lsmod | grep drbd
drbd                  364544  1
lru_cache              16384  1 drbd
libcrc32c              16384  2 dm_persistent_data,drbd
root@pmx0:~# modinfo drbd
filename:       /lib/modules/4.15.18-10-pve/kernel/drivers/block/drbd/drbd.ko
alias:          block-major-147-*
license:        GPL
version:        8.4.10
description:    drbd - Distributed Replicated Block Device v8.4.10
author:         Philipp Reisner <phil@linbit.com>, Lars Ellenberg <lars@linbit.com>
srcversion:     9A7FB947BDAB6A2C83BA0D4
depends:        lru_cache,libcrc32c
retpoline:      Y
intree:         Y
name:           drbd
vermagic:       4.15.18-10-pve SMP mod_unload modversions
parm:           allow_oos:DONT USE! (bool)
parm:           disable_sendpage:bool
parm:           proc_details:int
parm:           minor_count:Approximate number of drbd devices (1-255) (uint)
parm:           usermode_helper:string

坐骑:

root@pmx0:~# cat /proc/mounts
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,relatime 0 0
udev /dev devtmpfs rw,nosuid,relatime,size=24679656k,nr_inodes=6169914,mode=755 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=4940140k,mode=755 0 0
/dev/mapper/pve-root / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/rdma cgroup rw,nosuid,nodev,noexec,relatime,rdma 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=39,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=20879 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime,pagesize=2M 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
sunrpc /run/rpc_pipefs rpc_pipefs rw,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/sda1 /mnt/intelSSD700G ext3 rw,relatime,errors=remount-ro,data=ordered 0 0
lxcfs /var/lib/lxcfs fuse.lxcfs rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other 0 0
/dev/fuse /etc/pve fuse rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other 0 0
10.0.0.15:/samba/shp /mnt/pve/bckNFS nfs rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.0.0.15,mountvers=3,mountport=42772,mountproto=udp,local_lock=none,addr=10.0.0.15 0 0

Answer 1

尽管我的设置略有不同，但我遇到了类似的问题和错误消息:用于 DRBD 存储的 LVM 逻辑卷位于 MD raid1 之上。我不明白是什么导致了问题(系统停止了，我不得不冷启动)，但以下命令帮助我找到并解决了“繁忙”问题。

Code below from this blog

dmsetup info -c  => find Major and Minor of problematic device (253 and 2 in my case)

ls -la /sys/dev/block/253\:2/holders

包含指向/dev/dm-9 的链接

所有其他 drbd 设备的持有者指向类似 drbd3 -> ../../drbd3 的内容。

因此(警告:我不知道会造成什么损害。它对我有用):

dmsetup remove /dev/dm-9

drbdadm up RESOURCE