Dear all,
I have a strange Problem on a two node cluster, with an DRBD volume.
Each time I try to create a new logical volume I see this error:
c-r0212034:~# lvcreate -L 2G --name foo rep
device-mapper: reload ioctl failed: Invalid argument
Aborting. Failed to activate new LV to wipe the start of it.
I red a lot about this in the internet, but unfortunately it was not
possible to fix it till yet.
Please find some helpful output below:
# pvcreate /dev/drbd0
Physical volume "/dev/drbd0" successfully created
# vgcreate rep /dev/drbd0
Volume group "rep" successfully created
# pvscan
PV /dev/sda2 VG pve lvm2 [930.82 GB / 836.00 MB free]
PV /dev/drbd0 VG rep lvm2 [699.98 GB / 699.98 GB free]
# pvs
PV VG Fmt Attr PSize PFree
/dev/dm-3 rep lvm2 a- 699.98G 699.98G
/dev/sda2 pve lvm2 a- 930.82G 836.00M
LVM-Filter in lvm.conf: filter = ["a|sd.*|", "a|drbd.*|", "r|.*|"]
My drbd.conf:
global {
usage-count no;
# minor-count dialog-refresh disable-ip-verification
}
common {
protocol C;
handlers {
# fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
# split-brain "/usr/lib/drbd/notify-split-brain.sh root";
# out-of-sync "/usr/lib/drbd/notify-out-of-sync.sh root";
# before-resync-target
"/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";
# after-resync-target
/usr/lib/drbd/unsnapshot-resync-target-lvm.sh;
}
startup {
# wfc-timeout degr-wfc-timeout outdated-wfc-timeout
wait-after-sb
}
disk {
# on-io-error fencing use-bmbv no-disk-barrier no-disk-flushes
# no-disk-drain no-md-flushes max-bio-bvecs
}
net {
# sndbuf-size rcvbuf-size timeout connect-int
ping-int ping-timeout max-buffers
# max-epoch-size ko-count allow-two-primaries
cram-hmac-alg shared-secret
# after-sb-0pri after-sb-1pri after-sb-2pri
data-integrity-alg no-tcp-cork
}
syncer {
# rate after al-extents use-rle cpu-mask verify-alg csums-alg
rate 1000M;
}
}
resource r0 {
protocol C;
startup {
wfc-timeout 15; # wfc-timeout can be dangerous
(http://forum.proxmox.com/threads/3465-Is-it-safe-to-use-wfc-timeout-in-DRBD-configuration)
degr-wfc-timeout 60;
become-primary-on both;
}
net {
cram-hmac-alg sha1;
shared-secret "my-secret";
allow-two-primaries;
after-sb-0pri discard-zero-changes;
after-sb-1pri discard-secondary;
after-sb-2pri disconnect;
}
on c-r0212034 {
device /dev/drbd0;
disk /dev/pve/r0;
address 10.8.11.1:7788;
meta-disk internal;
}
on c-r0212035 {
device /dev/drbd0;
disk /dev/pve/r0;
address 10.8.11.2:7788;
meta-disk internal;
}
}
Syslog:
Oct 8 23:06:30 c-r0212034 kernel: device-mapper: table: 253:4:
linear: dm-linear: Device lookup failed
Oct 8 23:06:30 c-r0212034 kernel: device-mapper: ioctl: error adding
target to table
# lvcreate -L 2G -n foo rep -vvvv
#lvmcmdline.c:914 Processing: lvcreate -L 2G -n foo rep -vvvv
#lvmcmdline.c:917 O_DIRECT will be used
#config/config.c:950 Setting global/locking_type to 1
#locking/locking.c:223 File-based locking selected.
#config/config.c:927 Setting global/locking_dir to /var/lock/lvm
#activate/activate.c:362 Getting target version for linear
#ioctl/libdm-iface.c:1606 dm version OF [16384]
#ioctl/libdm-iface.c:1606 dm versions OF [16384]
#activate/activate.c:362 Getting target version for striped
#ioctl/libdm-iface.c:1606 dm versions OF [16384]
#lvcreate.c:302 Setting logging type to disk
#config/config.c:950 Setting activation/mirror_region_size to 512
#lvcreate.c:895 Finding volume group "rep"
#locking/file_locking.c:164 Locking /var/lock/lvm/V_rep WB
#filters/filter-regex.c:172 /dev/ram0: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop0: Skipping (regex)
#device/dev-io.c:439 Opened /dev/sda RO
#device/dev-io.c:260 /dev/sda: size is 1953124352 sectors
#device/dev-io.c:340 WARNING: /dev/sda already opened read-only
#device/dev-io.c:515 /dev/sda: Immediate close attempt while
still referenced
#device/dev-io.c:485 Closed /dev/sda
#device/dev-io.c:439 Opened /dev/sda RW O_DIRECT
#device/dev-io.c:134 /dev/sda: block size is 4096 bytes
#filters/filter.c:124 /dev/sda: Skipping: Partition table
signature found
#device/dev-io.c:485 Closed /dev/sda
#device/dev-io.c:439 Opened /dev/drbd0 RW O_DIRECT
#device/dev-io.c:134 /dev/drbd0: block size is 4096 bytes
#label/label.c:160 /dev/drbd0: lvm2 label detected
#cache/lvmcache.c:965 lvmcache: /dev/drbd0: now in VG
#orphans_lvm2 (#orphans_lvm2)
#format_text/format-text.c:1095 /dev/drbd0: Found metadata at
8704 size 632 (in area at 4096 size 192512) for rep
(JwEqO3-epv4-evmI-hlcg-owfl-pjrT-foel0n)
#cache/lvmcache.c:965 lvmcache: /dev/drbd0: now in VG rep with 1 mdas
#cache/lvmcache.c:752 lvmcache: /dev/drbd0: setting rep VGID
to JwEqO3epv4evmIhlcgowflpjrTfoel0n
#cache/lvmcache.c:1002 lvmcache: /dev/drbd0: VG rep: Set
creation host to c-r0212034.
#filters/filter-regex.c:172 /dev/dm-0: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram1: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop1: Skipping (regex)
#device/dev-io.c:439 Opened /dev/sda1 RW O_DIRECT
#device/dev-io.c:134 /dev/sda1: block size is 4096 bytes
#label/label.c:184 /dev/sda1: No label detected
#label/label.c:287 <backtrace>
#device/dev-io.c:485 Closed /dev/sda1
#filters/filter-regex.c:172 /dev/root: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram2: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop2: Skipping (regex)
#device/dev-io.c:439 Opened /dev/sda2 RW O_DIRECT
#device/dev-io.c:134 /dev/sda2: block size is 4096 bytes
#label/label.c:160 /dev/sda2: lvm2 label detected
#cache/lvmcache.c:965 lvmcache: /dev/sda2: now in VG
#orphans_lvm2 (#orphans_lvm2)
#format_text/format-text.c:1095 /dev/sda2: Found metadata at
18432 size 1590 (in area at 4096 size 192512) for pve
(KLwqKx-bXU4-4cZO-ZtxL-tO0g-8Cop-Ex5ubf)
#cache/lvmcache.c:965 lvmcache: /dev/sda2: now in VG pve with 1 mdas
#cache/lvmcache.c:752 lvmcache: /dev/sda2: setting pve VGID to
KLwqKxbXU44cZOZtxLtO0g8CopEx5ubf
#cache/lvmcache.c:1002 lvmcache: /dev/sda2: VG pve: Set
creation host to c-r0212034.
#device/dev-io.c:485 Closed /dev/sda2
#filters/filter-regex.c:172 /dev/dm-2: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram3: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop3: Skipping (regex)
#device/dev-io.c:439 Opened /dev/dm-3 RW O_DIRECT
#device/dev-io.c:134 /dev/dm-3: block size is 4096 bytes
#label/label.c:160 /dev/dm-3: lvm2 label detected
#cache/lvmcache.c:1133 Duplicate PV
ayC0bjchgYw0zf2ye3nTDIYbn3qjLwge on /dev/drbd0 - using dm /dev/dm-3
#cache/lvmcache.c:965 lvmcache: /dev/dm-3: now in VG
#orphans_lvm2 (#orphans_lvm2) with 1 mdas
#format_text/format-text.c:1095 /dev/dm-3: Found metadata at
8704 size 632 (in area at 4096 size 192512) for rep
(JwEqO3-epv4-evmI-hlcg-owfl-pjrT-foel0n)
#cache/lvmcache.c:965 lvmcache: /dev/dm-3: now in VG rep with 1 mdas
#cache/lvmcache.c:752 lvmcache: /dev/dm-3: setting rep VGID to
JwEqO3epv4evmIhlcgowflpjrTfoel0n
#cache/lvmcache.c:1002 lvmcache: /dev/dm-3: VG rep: Set
creation host to c-r0212034.
#filters/filter-regex.c:172 /dev/ram4: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop4: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram5: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop5: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram6: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop6: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram7: Skipping (regex)
#filters/filter-regex.c:172 /dev/loop7: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram8: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram9: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram10: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram11: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram12: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram13: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram14: Skipping (regex)
#filters/filter-regex.c:172 /dev/ram15: Skipping (regex)
#label/label.c:270 Using cached label for /dev/dm-3
#label/label.c:270 Using cached label for /dev/dm-3
#format_text/format-text.c:476 Read rep metadata (5) from
/dev/dm-3 at 8704 size 632
#metadata/pv_manip.c:272 /dev/dm-3 0: 0 179194: NULL(0:0)
#format_text/archiver.c:123 Archiving volume group "rep" metadata
(seqno 5).
#metadata/lv_manip.c:1822 Creating logical volume foo
#metadata/pv_map.c:47 Allowing allocation on /dev/dm-3 start
PE 0 length 179194
#metadata/pv_manip.c:272 /dev/dm-3 0: 0 512: foo(0:0)
#metadata/pv_manip.c:272 /dev/dm-3 1: 512 178682: NULL(0:0)
#format_text/format-text.c:566 Writing rep metadata to
/dev/dm-3 at 9728 len 881
#format_text/format-text.c:662 Pre-Committing rep metadata (6)
to /dev/dm-3 header at 4096
#format_text/archiver.c:363 Creating volume group backup
"/etc/lvm/backup/rep" (seqno 6).
#format_text/format-text.c:852 Writing rep metadata to
/etc/lvm/backup/.lvm_c-r0212034_8388_1357441257
#format_text/format-text.c:896 Committing rep metadata (6)
#format_text/format-text.c:897 Renaming
/etc/lvm/backup/rep.tmp to /etc/lvm/backup/rep
#format_text/format-text.c:662 Committing rep metadata (6) to
/dev/dm-3 header at 4096
#locking/file_locking.c:244 Locking LV
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH (R)
#metadata/metadata.c:1858 Finding volume group for uuid
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
#label/label.c:270 Using cached label for /dev/dm-3
#label/label.c:270 Using cached label for /dev/dm-3
#format_text/format-text.c:476 Read rep metadata (6) from
/dev/dm-3 at 9728 size 881
#metadata/metadata.c:1864 Found volume group "rep"
#activate/activate.c:447 Getting device info for rep-foo
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
NF [16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH NF
[16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo NF [16384]
#mm/memlock.c:99 Locking memory
#mm/memlock.c:130 memlock_count inc to 1
#config/config.c:927 Setting activation/missing_stripe_filler to
/dev/ioerror
#activate/dev_manager.c:632 Getting device info for rep-foo
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
OF [16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH OF
[16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo OF [16384]
#activate/dev_manager.c:632 Getting device info for
rep-foo-real
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-real]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-real OF
[16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-real
OF [16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo-real OF [16384]
#activate/dev_manager.c:632 Getting device info for
rep-foo-cow
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-cow]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-cow OF
[16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-cow
OF [16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo-cow OF [16384]
#activate/dev_manager.c:632 Getting device info for
rep-foo_mlog
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-_mlog]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-_mlog OF
[16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-_mlog
OF [16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo_mlog OF [16384]
#activate/dev_manager.c:823 Checking kernel supports striped
segment type for foo
#ioctl/libdm-iface.c:1606 dm deps (253:3) OF [16384]
#libdm-deptree.c:1187 Creating rep-foo
#ioctl/libdm-iface.c:1606 dm create rep-foo
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
NF [16384]
#libdm-common.c:607 rep-foo: Stacking NODE_ADD (253,4) 0:6 0660
#libdm-deptree.c:1463 Loading rep-foo table
#libdm-deptree.c:1413 Adding target: 0 4194304 linear 253:3 384
#ioctl/libdm-iface.c:1606 dm table (253:4) OF [16384]
#ioctl/libdm-iface.c:1606 dm reload (253:4) NF [16384]
#ioctl/libdm-iface.c:1623 device-mapper: reload ioctl failed:
Invalid argument
#libdm-deptree.c:1538 <backtrace>
#activate/dev_manager.c:1089 <backtrace>
#activate/dev_manager.c:1116 <backtrace>
#activate/activate.c:579 <backtrace>
#mm/memlock.c:118 Unlocking memory
#mm/memlock.c:137 memlock_count dec to 0
#libdm-common.c:312 Created /dev/mapper/rep-foo
#lvcreate.c:803 Aborting. Failed to activate new LV to wipe the start of it.
#locking/file_locking.c:239 Locking LV
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH (NL)
#metadata/metadata.c:1858 Finding volume group for uuid
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
#label/label.c:270 Using cached label for /dev/dm-3
#label/label.c:270 Using cached label for /dev/dm-3
#format_text/format-text.c:476 Read rep metadata (6) from
/dev/dm-3 at 9728 size 881
#metadata/metadata.c:1864 Found volume group "rep"
#activate/activate.c:447 Getting device info for rep-foo
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
OF [16384]
#mm/memlock.c:99 Locking memory
#mm/memlock.c:130 memlock_count inc to 1
#activate/dev_manager.c:632 Getting device info for rep-foo
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
OF [16384]
#ioctl/libdm-iface.c:1606 dm deps (253:4) OF [16384]
#activate/dev_manager.c:632 Getting device info for
rep-foo-real
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-real]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-real OF
[16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-real
OF [16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo-real OF [16384]
#activate/dev_manager.c:632 Getting device info for
rep-foo-cow
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-cow]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-cow OF
[16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-cow
OF [16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo-cow OF [16384]
#activate/dev_manager.c:632 Getting device info for
rep-foo_mlog
[LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-_mlog]
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-_mlog OF
[16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH-_mlog
OF [16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo_mlog OF [16384]
#ioctl/libdm-iface.c:1606 dm info (253:4) OF [16384]
#libdm-deptree.c:830 Removing rep-foo (253:4)
#ioctl/libdm-iface.c:1606 dm remove (253:4) NF [16384]
#libdm-common.c:623 rep-foo: Stacking NODE_DEL (replaces other
stacked ops)
#mm/memlock.c:118 Unlocking memory
#mm/memlock.c:137 memlock_count dec to 0
#libdm-common.c:374 Removed /dev/mapper/rep-foo
#locking/file_locking.c:234 Unlocking LV
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
#metadata/metadata.c:1858 Finding volume group for uuid
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
#label/label.c:270 Using cached label for /dev/dm-3
#label/label.c:270 Using cached label for /dev/dm-3
#format_text/format-text.c:476 Read rep metadata (6) from
/dev/dm-3 at 9728 size 881
#metadata/metadata.c:1864 Found volume group "rep"
#activate/activate.c:447 Getting device info for rep-foo
#ioctl/libdm-iface.c:1606 dm info
LVM-JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH
NF [16384]
#ioctl/libdm-iface.c:1606 dm info
JwEqO3epv4evmIhlcgowflpjrTfoel0nRC7uHcquGNP3nLrV0xKm4ugMvFEVs1PH NF
[16384]
#ioctl/libdm-iface.c:1606 dm info rep-foo NF [16384]
#metadata/pv_manip.c:272 /dev/dm-3 0: 0 512: NULL(0:0)
#metadata/pv_manip.c:272 /dev/dm-3 1: 512 178682: NULL(0:0)
#format_text/format-text.c:566 Writing rep metadata to
/dev/dm-3 at 10752 len 632
#format_text/format-text.c:662 Pre-Committing rep metadata (7)
to /dev/dm-3 header at 4096
#format_text/archiver.c:363 Creating volume group backup
"/etc/lvm/backup/rep" (seqno 7).
#format_text/format-text.c:852 Writing rep metadata to
/etc/lvm/backup/.lvm_c-r0212034_8388_227330571
#format_text/format-text.c:896 Committing rep metadata (7)
#format_text/format-text.c:897 Renaming
/etc/lvm/backup/rep.tmp to /etc/lvm/backup/rep
#format_text/format-text.c:662 Committing rep metadata (7) to
/dev/dm-3 header at 4096
#locking/file_locking.c:59 Unlocking /var/lock/lvm/V_rep
#device/dev-io.c:485 Closed /dev/drbd0
#device/dev-io.c:485 Closed /dev/dm-3
It looks like there is a problem with the LVM filter?? I already tried
a lot of different filters, but it didnt helped. I have the same
configuration perfectly running on an other cluster.
Home somebody of can help me! Thanks a lot...
Best regards,
Markus
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