Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi,
We are using drbd to replicate vm disk images. Each virtual disk is
configured on a separate volume (LVM) with an shared external metadata
volume. Recently we have changed from Ubuntu Precise running a 3.8
kernel to Trusty with 3.13 and now during system boot we see:
[4439]:drbd_md_sync_page_io(,262144s,READ) out of range md access!
However that only shows for devices which are using an index in the
metadata device != 0. If the sector size is 512bytes and metadata slots
are 128Mb then this read should be from the 0 position for that metadata
chunk suggesting that this is getting printed in error? The relevant
block from the kernel source in v3.13 is
if (sector < drbd_md_first_sector(bdev) ||
sector + 7 > drbd_md_last_sector(bdev))
dev_alert(DEV, "%s [%d]:%s(,%llus,%s) out of range md
access!\n",
current->comm, current->pid, __func__,
(unsigned long long)sector, (rw & WRITE) ? "WRITE"
: "READ");
Is my understanding correct that this is benign or is this something
that we should worry about?
Thanks,
James
These are all the messages recorded in syslog while the drbd devices are
being configured.
[ 435.302219] drbd: initialized. Version: 8.4.3 (api:1/proto:86-101)
[ 435.302224] drbd: srcversion: FD2AB826D8AFD9700421E57
[ 435.302226] drbd: registered as block device major 147
[ 435.924995] d-con 3b3a-420b-b760-f1ea494f154d-1-bin: Starting worker
thread (from drbdsetup [6921])
[ 435.940596] block drbd1000: disk( Diskless -> Attaching )
[ 435.940705] d-con 3b3a-420b-b760-f1ea494f154d-1-bin: Method to ensure
write ordering: flush
[ 435.940707] block drbd1000: max BIO size = 4096
[ 435.940711] block drbd1000: drbd_bm_resize called with capacity ==
5244928
[ 435.940720] block drbd1000: resync bitmap: bits=655616 words=10244
pages=21
[ 435.940722] block drbd1000: size = 2561 MB (2622464 KB)
[ 435.952494] block drbd1000: Writing the whole bitmap, size changed
[ 435.955598] block drbd1000: bitmap WRITE of 21 pages took 0 jiffies
[ 435.968355] block drbd1000: 2561 MB (655616 bits) marked out-of-sync
by on disk bit-map.
[ 436.061811] block drbd1000: bitmap READ of 21 pages took 0 jiffies
[ 436.061824] block drbd1000: recounting of set bits took additional 0
jiffies
[ 436.061826] block drbd1000: 2561 MB (655552 bits) marked out-of-sync
by on disk bit-map.
[ 436.061830] block drbd1000: disk( Attaching -> Inconsistent )
[ 436.061832] block drbd1000: attached to UUIDs
0000000000000004:0000000000000000:0000000000000000:0000000000000000
[ 436.122874] d-con 3b3a-420b-b760-f1ea494f154d-1-cfg: Starting worker
thread (from drbdsetup [7008])
[ 436.142018] block drbd1002: drbdsetup
[7008]:drbd_md_sync_page_io(,524288s,READ) out of range md access!
[ 436.142419] block drbd1002: disk( Diskless -> Attaching )
[ 436.142529] d-con 3b3a-420b-b760-f1ea494f154d-1-cfg: Method to ensure
write ordering: flush
[ 436.142532] block drbd1002: max BIO size = 4096
[ 436.142535] block drbd1002: drbd_bm_resize called with capacity == 264192
[ 436.142538] block drbd1002: resync bitmap: bits=33024 words=516 pages=2
[ 436.142540] block drbd1002: size = 129 MB (132096 KB)
[ 436.155712] block drbd1002: Writing the whole bitmap, size changed
[ 436.155772] block drbd1002: bitmap WRITE of 2 pages took 0 jiffies
[ 436.164093] block drbd1002: 129 MB (33024 bits) marked out-of-sync by
on disk bit-map.
[ 436.219949] block drbd1002: bitmap READ of 2 pages took 0 jiffies
[ 436.219952] block drbd1002: recounting of set bits took additional 0
jiffies
[ 436.219954] block drbd1002: 129 MB (32960 bits) marked out-of-sync by
on disk bit-map.
[ 436.219958] block drbd1002: disk( Attaching -> Inconsistent )
[ 436.219960] block drbd1002: attached to UUIDs
0000000000000004:0000000000000000:0000000000000000:0000000000000000
[ 436.276434] d-con 3b3a-420b-b760-f1ea494f154d-1-dat: Starting worker
thread (from drbdsetup [7051])
[ 436.278703] block drbd1003: drbdsetup
[7051]:drbd_md_sync_page_io(,786432s,READ) out of range md access!
[ 436.278748] block drbd1003: disk( Diskless -> Attaching )
[ 436.278853] d-con 3b3a-420b-b760-f1ea494f154d-1-dat: Method to ensure
write ordering: flush
[ 436.278856] block drbd1003: max BIO size = 4096
[ 436.278860] block drbd1003: drbd_bm_resize called with capacity ==
8390656
[ 436.278872] block drbd1003: resync bitmap: bits=1048832 words=16388
pages=33
[ 436.278873] block drbd1003: size = 4097 MB (4195328 KB)
[ 436.286634] block drbd1003: Writing the whole bitmap, size changed
[ 436.286957] block drbd1003: bitmap WRITE of 33 pages took 0 jiffies
[ 436.308142] block drbd1003: 4097 MB (1048832 bits) marked out-of-sync
by on disk bit-map.
[ 436.378622] block drbd1003: bitmap READ of 33 pages took 0 jiffies
[ 436.378658] block drbd1003: recounting of set bits took additional 0
jiffies
[ 436.378661] block drbd1003: 4097 MB (1048768 bits) marked out-of-sync
by on disk bit-map.
[ 436.378666] block drbd1003: disk( Attaching -> Inconsistent )
[ 436.378670] block drbd1003: attached to UUIDs
0000000000000004:0000000000000000:0000000000000000:0000000000000000
[ 436.415499] d-con 3b3a-420b-b760-f1ea494f154d-1-vol: Starting worker
thread (from drbdsetup [7057])
[ 436.419093] block drbd1001: drbdsetup
[7057]:drbd_md_sync_page_io(,262144s,READ) out of range md access!
[ 436.419187] block drbd1001: disk( Diskless -> Attaching )
[ 436.419379] d-con 3b3a-420b-b760-f1ea494f154d-1-vol: Method to ensure
write ordering: flush
[ 436.419383] block drbd1001: max BIO size = 4096
[ 436.419388] block drbd1001: drbd_bm_resize called with capacity ==
6293504
[ 436.419409] block drbd1001: resync bitmap: bits=786688 words=12292
pages=25
[ 436.419412] block drbd1001: size = 3073 MB (3146752 KB)
[ 436.429188] block drbd1001: Writing the whole bitmap, size changed
[ 436.429764] block drbd1001: bitmap WRITE of 25 pages took 0 jiffies
[ 436.441135] block drbd1001: 3073 MB (786688 bits) marked out-of-sync
by on disk bit-map.
[ 436.484556] block drbd1001: bitmap READ of 25 pages took 0 jiffies
[ 436.484584] block drbd1001: recounting of set bits took additional 0
jiffies
[ 436.484587] block drbd1001: 3073 MB (786624 bits) marked out-of-sync
by on disk bit-map.
[ 436.484592] block drbd1001: disk( Attaching -> Inconsistent )
[ 436.484596] block drbd1001: attached to UUIDs
0000000000000004:0000000000000000:0000000000000000:0000000000000000