Hi,
We would like to force resync on standby if uuid_compare rule==4 ONLY.
Why?? We are seeing DRBD files corrupted consistently and each time corruption
is seen rule is 4. Mail chain below has full details.
Yes this is a work around because we are on DRBD-8.0.16
snmpd version upgrade is a strict NO, NO.
Whenever we observed the following two lines, we recreated metadata on
secondary node and there was not file corruption seen.
File Corruption: Content of other files are seen in snmpd.conf file. File
corrupted is always snmpd.conf
--> uuid_compare()=0 by rule 4
--> No resync, but 78 bits in bitmap! <<<< Number of bits
is variable. >>>>
invalidate and invalidate-remote options are available under drbdadm tool, but
can only be invoked externally???
We would like to kick of sync only when we hit uuid_compare() by rule 4.
Work around below needs tweaking:
case 0:
INFO("Lak: 0 by Rule 4, current state = %d current role =
%d ! \n",
mdev->state.conn, mdev->state.role);
/* !self_pri && !peer_pri */
if (mdev->state.conn == WFBitMapT) {
drbd_start_resync(mdev, SyncTarget);
}
else if (mdev->state.conn == WFBitMapS) {
drbd_start_resync(mdev, SyncSource);
}
else if (mdev->state.conn == SyncTarget) {
drbd_start_resync(mdev, SyncTarget);
}
else if (mdev->state.conn == SyncSource) {
drbd_start_resync(mdev, SyncSource);
}
else if (mdev->state.role == Secondary) {
drbd_start_resync(mdev, SyncTarget);
}
return 0;
dmesg output on Standby Controller:
drbd0: Lak: 0 by Rule 4, current state = 9 current role = 2 !
drbd0: State change failed: Refusing to be inconsistent on both nodes
drbd0: state = { cs:WFReportParams st:Secondary/Unknown ds:UpToDate/DUnknown
r--- }
drbd0: wanted = { cs:SyncTarget st:Secondary/Unknown ds:Inconsistent/DUnknown
r--- }
LAK
From: [email protected]
To: [email protected]
Date: Wed, 3 Nov 2010 06:50:46 +0000
Subject: [DRBD-user] Issue with uuid_compare by rule 4
Hi,
DRBD -Version 8.0.16 (Code for uuid_compare by rule 4 is same in all DRBD-8.x.y
versions)
We are consistently seeing content of snmpd.conf get corrupted -- sometimes it
shows iptables and sometimes it has some wierd binary data.
In all the instances we have seen corruption, Pattern observed from dmesg
uuid_compare()=0 by rule 4
No resync, but 78 bits in bitmap! <<<< Number of bits is
variable. >>>>
>From drbd change log history we see that UUID_COMPARISON algorith was
>improved.
* Sat Apr 07 2007 21:32:39 +0200 Philipp Reisner <phil(at)linbit.com>
- drbd (8.0.2-1)
* Improved the robustness of the UUID based algorithm that decides about the
resync direction.
We would like to force sync in the rule 4 by doing the following, need your
help in this regard.
case 0:
/* !self_pri && !peer_pri */
if (mdev->state.conn == WFBitMapT) {
drbd_start_resync(mdev, SyncTarget);
}
else if (mdev->state.conn == WFBitMapS) {
drbd_start_resync(mdev, SyncSource);
}
else if (mdev->state.conn == SyncTarget) {
drbd_start_resync(mdev, SyncTarget);
}
else if (mdev->state.conn == SyncSource) {
drbd_start_resync(mdev, SyncSource);
}
return 0;
Testcase we are running:
Reset active board every 5 mins on a Redundant Setup.
dmesg output:
11-02 22:10:23 unknown kernel drbd0: drbd_sync_handshake:
11-02 22:10:23 unknown kernel drbd0: self
52A974873622A8A8:0000000000000000:D1A184CD02C8EE0D:BD9572546D8C332D
11-02 22:10:23 unknown kernel drbd0: peer
77F8DC91C89BA0F9:52A974873622A8A8:D1A184CD02C8EE0C:BD9572546D8C332D
11-02 22:10:23 unknown kernel drbd0: uuid_compare()=-1 by rule 5
11-02 22:10:23 unknown kernel drbd0: peer( Unknown -> Primary ) conn(
WFReportParams -> WFBitMapT ) pdsk( DUnknown -> UpToDate )
11-02 22:10:23 unknown kernel drbd0: conn( WFBitMapT -> WFSyncUUID )
11-02 22:10:23 unknown kernel drbd0: conn( WFSyncUUID -> SyncTarget ) disk(
UpToDate -> Inconsistent )
11-02 22:10:23 unknown kernel drbd0: Began resync as SyncTarget (will sync 324
KB [81 bits set]).
11-02 22:10:23 unknown kernel drbd0: Resync done (total 1 sec; paused 0 sec;
324 K/sec)
11-02 22:10:23 unknown kernel drbd0: conn( SyncTarget -> Connected ) disk(
Inconsistent -> UpToDate )
11-02 22:10:24 unknown kernel drbd0: local disk flush failed with status -95,
disabling disk-flushes
11-02 22:14:13 unknown kernel drbd0: peer( Primary -> Secondary )
11-02 22:14:14 unknown kernel drbd0: role( Secondary -> Primary )
11-02 22:14:14 unknown kernel EXT3 FS on drbd0, internal journal
11-02 22:14:14 unknown kernel SELinux: initialized (dev drbd0, type ext3), uses
xattr
11-02 22:14:18 unknown kernel drbd0: peer( Secondary -> Unknown ) conn(
Connected -> TearDown ) pdsk( UpToDate -> DUnknown )
11-02 22:14:18 unknown kernel drbd0: Creating new current UUID
11-02 22:14:18 unknown kernel drbd0: meta connection shut down by peer.
11-02 22:14:18 unknown kernel drbd0: asender terminated
11-02 22:14:18 unknown kernel drbd0: Terminating asender thread
11-02 22:14:19 unknown kernel drbd0: Connection closed
11-02 22:14:19 unknown kernel drbd0: conn( TearDown -> Unconnected )
11-02 22:14:19 unknown kernel drbd0: receiver terminated
11-02 22:14:19 unknown kernel drbd0: Restarting receiver thread
11-02 22:14:19 unknown kernel drbd0: receiver (re)started
11-02 22:14:19 unknown kernel drbd0: conn( Unconnected -> WFConnection )
11-02 22:15:16 unknown kernel drbd0: Handshake successful: DRBD Network
Protocol version 86
11-02 22:15:16 unknown kernel drbd0: conn( WFConnection -> WFReportParams )
11-02 22:15:16 unknown kernel drbd0: Starting asender thread (from
drbd0_receiver [1495])
11-02 22:15:16 unknown kernel drbd0: Considerable difference in lower level
device sizes: 18768s vs. 32176s
11-02 22:15:16 unknown kernel drbd0: drbd_sync_handshake:
11-02 22:15:16 unknown kernel drbd0: self
77F8DC91C89BA0F9:77F8DC91C89BA0F9:A1454CD240FF75F4:52A974873622A8A8
11-02 22:15:16 unknown kernel drbd0: peer
77F8DC91C89BA0F8:0000000000000000:A1454CD240FF75F4:52A974873622A8A8
11-02 22:15:16 unknown kernel drbd0: uuid_compare()=0 by rule 4
11-02 22:15:16 unknown kernel drbd0: No resync, but 78 bits in bitmap!
11-02 22:15:16 unknown kernel drbd0: peer( Unknown -> Secondary ) conn(
WFReportParams -> Connected ) pdsk( DUnknown -> UpToDate )
11-02 22:19:20 unknown kernel drbd0: role( Primary -> Secondary )
11-02 22:19:20 unknown kernel drbd0: peer( Secondary -> Unknown ) conn(
Connected -> Disconnecting ) pdsk( UpToDate -> DUnknown )
LAK
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