Estou executando drbd83 com ocfs2 em centos 5 e planejando usar packemaker com eles.
Há algum tempo, estou enfrentando drbd split brain problem.
version: 8.3.13 (api:88/proto:86-96)
GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 build by [email protected], 2012-05-07 11:56:36
1: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r-----
ns:0 nr:0 dw:112281991 dr:797551 al:99 bm:6401 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:60
Eu não posso mudar meu drbd para secundário.
drbdadm secondary r0
1: State change failed: (-12) Device is held open by someone
Command 'drbdsetup 1 secondary' terminated with exit code 11
Minha configuração de recurso drbd :
resource r0 {
syncer {
rate 1000M;
verify-alg sha1;
}
disk {
on-io-error detach;
}
handlers {
pri-lost-after-sb "/usr/lib/drbd/notify-split-brain.sh root";
}
net {
allow-two-primaries;
after-sb-0pri discard-younger-primary;
after-sb-1pri call-pri-lost-after-sb;
after-sb-2pri call-pri-lost-after-sb;
}
startup { become-primary-on both; }
on serving_4130{
device /dev/drbd1;
disk /dev/sdb1;
address 192.168.4.130:7789;
meta-disk internal;
}
on MT305-3182 {
device /dev/drbd1;
disk /dev/xvdb1;
address 192.168.3.182:7789;
meta-disk internal;
}
}
Status do status do ocfs2:
service ocfs2 status
Configured OCFS2 mountpoints: /data
lsof mostra que existe um processo relativo com drbd.
lsof | grep drbd
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
drbd1_wor 7782 root cwd DIR 253,0 4096 2 /
drbd1_wor 7782 root rtd DIR 253,0 4096 2 /
drbd1_wor 7782 root txt unknown /proc/7782/exe
E é um link simbólico morto:
# ls -l /proc/7782/exe
ls: cannot read symbolic link /proc/7782/exe: No such file or directory
lrwxrwxrwx 1 root root 0 May 4 09:56 /proc/7782/exe
# ps -ef | awk '$2 == "7782" { print $0 }'
root 7782 1 0 Apr22 ? 00:00:20 [drbd1_worker]
Observe que esse processo é agrupado em colchetes:
man ps :
args COMMAND command with all its arguments as a string. Modifications to the arguments may be shown. The
output in this column may contain spaces. A process marked <defunct> is partly dead, waiting to
be fully destroyed by its parent. Sometimes the process args will be unavailable; when this
happens, ps will instead print the executable name in brackets.
Então, a pergunta final é: como podemos recuperar manualmente o DRBD neste caso sem reinicializar ?
Responder a @andreask:
Minha tabela de partições:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
35G 6.9G 27G 21% /
/dev/xvda1 99M 20M 74M 22% /boot
tmpfs 1.0G 0 1.0G 0% /dev/shm
/dev/drbd1 100G 902M 100G 1% /data
Os nomes dos dispositivos:
# dmsetup ls --tree -o inverted
(202:2)
├─VolGroup00-LogVol01 (253:1)
└─VolGroup00-LogVol00 (253:0)
Preste atenção no dispositivo de bloco ( 253:0 ), é o mesmo da saída de lsof :
# lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID vCd152-amVZ-GaPo-H9Zs-TIS0-KI6j-ej8kYi
LV Write Access read/write
LV Status available
# open 1
LV Size 35.97 GB
Current LE 1151
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
Responder a @Doug:
# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 39.88 GB
PE Size 32.00 MB
Total PE 1276
Alloc PE / Size 1276 / 39.88 GB
Free PE / Size 0 / 0
VG UUID OTwzII-AP5H-nIbH-k2UA-H9nw-juBv-wcvmBq
ATUALIZAÇÃO Sex 17 de maio 16:08:16 ICT 2013
Aqui estão alguns idéias de Lars Ellenberg :
if the filesystem is still mounted ... oh well. unmount it. not lazy,
but really.
Tenho certeza que o OCFS2 já foi desmontado.
If nfs was involved, try
killall -9 nfsd
killall -9 lockd
echo 0 > /proc/fs/nfsd/threads
Não, o NFS não estava envolvido.
if lvm/dmsetup/kpartx/multipath/udev is involved, try
dmsetup ls --tree -o inverted
and check if there are dependencies from drbd.
Como você pode ver na saída acima, o LVM não está relacionado ao DRBD:
pvdisplay -m
--- Physical volume ---
PV Name /dev/xvda2
VG Name VolGroup00
PV Size 39.90 GB / not usable 20.79 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1276
Free PE 0
Allocated PE 1276
PV UUID 1t4hkB-p43c-ABex-stfQ-XaRt-9H4i-51gSTD
--- Physical Segments ---
Physical extent 0 to 1148:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 0 to 1148
Physical extent 1149 to 1275:
Logical volume /dev/VolGroup00/LogVol01
Logical extents 0 to 126
fdisk -l
Disk /dev/xvda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 13 104391 83 Linux
/dev/xvda2 14 5221 41833260 8e Linux LVM
Disk /dev/xvdb: 107.3 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/xvdb1 1 13054 104856223+ 83 Linux
if loop/cryptoloop/etc is involved, check if one of those is still
accessing them.
if some virtualization tecknique is in use, shut down/destroy all
containers/VMs that may have been accessing that drbd during their
life time.
Não, isso não acontece.
Sometimes it is just udev or equivalent doing a race.
Eu desativei a regra multipath e pare o udevd e nada mude.
Sometimes it is a unix domain socket or similar still held open (won't
necessary show up in lsof/fuser).
Se sim, como podemos descobrir esse soquete unix?
ATUALIZAÇÃO Qua 22 de maio 22:10:41 ICT 2013
Aqui está o stacktrace do processo de trabalho do DRBD ao despejar via chave mágica do SysRq :
kernel: drbd1_worker S ffff81007ae21820 0 7782 1 7795 7038 (L-TLB)
kernel: ffff810055d89e00 0000000000000046 000573a8befba2d6 ffffffff8008e82f
kernel: 00078d18577c6114 0000000000000009 ffff81007ae21820 ffff81007fcae040
kernel: 00078d18577ca893 00000000000002b1 ffff81007ae21a08 000000017a590180
kernel: Call Trace:
kernel: [<ffffffff8008e82f>] enqueue_task+0x41/0x56
kernel: [<ffffffff80063002>] thread_return+0x62/0xfe
kernel: [<ffffffff80064905>] __down_interruptible+0xbf/0x112
kernel: [<ffffffff8008ee84>] default_wake_function+0x0/0xe
kernel: [<ffffffff80064713>] __down_failed_interruptible+0x35/0x3a
kernel: [<ffffffff885d461a>] :drbd:.text.lock.drbd_worker+0x2d/0x43
kernel: [<ffffffff885eca37>] :drbd:drbd_thread_setup+0x127/0x1e1
kernel: [<ffffffff800bab82>] audit_syscall_exit+0x329/0x344
kernel: [<ffffffff8005dfb1>] child_rip+0xa/0x11
kernel: [<ffffffff885ec910>] :drbd:drbd_thread_setup+0x0/0x1e1
kernel: [<ffffffff8005dfa7>] child_rip+0x0/0x11
Não tenho certeza se essa região de pulsação do OCFS2 está impedindo que o DRBD mude para o secundário:
kernel: o2hb-C3E41CA2 S ffff810002536420 0 9251 31 3690 (L-TLB)
kernel: ffff810004af7d20 0000000000000046 ffff810004af7d30 ffffffff80063002
kernel: 1400000004000000 000000000000000a ffff81007ec307a0 ffffffff80319b60
kernel: 000935c260ad6764 0000000000000fcd ffff81007ec30988 0000000000027e86
kernel: Call Trace:
kernel: [<ffffffff80063002>] thread_return+0x62/0xfe
kernel: [<ffffffff8006389f>] schedule_timeout+0x8a/0xad
kernel: [<ffffffff8009a41d>] process_timeout+0x0/0x5
kernel: [<ffffffff8009a97c>] msleep_interruptible+0x21/0x42
kernel: [<ffffffff884b3b0b>] :ocfs2_nodemanager:o2hb_thread+0xd2c/0x10d6
kernel: [<ffffffff80063002>] thread_return+0x62/0xfe
kernel: [<ffffffff800a329f>] keventd_create_kthread+0x0/0xc4
kernel: [<ffffffff884b2ddf>] :ocfs2_nodemanager:o2hb_thread+0x0/0x10d6
kernel: [<ffffffff800a329f>] keventd_create_kthread+0x0/0xc4
kernel: [<ffffffff80032632>] kthread+0xfe/0x132
kernel: [<ffffffff8005dfb1>] child_rip+0xa/0x11
kernel: [<ffffffff800a329f>] keventd_create_kthread+0x0/0xc4
kernel: [<ffffffff80032534>] kthread+0x0/0x132
kernel: [<ffffffff8005dfa7>] child_rip+0x0/0x11