[DRBD-user] out-of-sync based on AL

[Ross S. W. Walker]

> -----Original Message-----
> From: drbd-user-bounces at lists.linbit.com 
> [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of 
> Cristian Zamfir
> Sent: Wednesday, February 14, 2007 12:52 PM
> To: drbd-user at lists.linbit.com
> Subject: [DRBD-user] out-of-sync based on AL
> 
> 
> Hi,
> 
> I am trying to understand why the AL is marking 196MB as out of sync.
> I have two connected primaries A and B. After they are synced 
> I detach 
> B. In the mean time, the disk on A is not used. I reconnect B 
> and the on 
> disk bit map sees that no bytes are out-of-sync, but AL marks 
> 196MB as 
> out-of-sync.
> 
> In case I am misunderstandings something, can you please 
> explain a bit 
> how the AL works?
> 
> This is what dmesg says on node B:
> 
> 
> [11989.600828] drbd1: disk( UpToDate -> Diskless )
> [11994.007899] drbd1: disk( Diskless -> Attaching )
> [11994.040025] drbd1: Found 6 transactions (50 active extents) in 
> activity log.
> [11994.040067] drbd1: max_segment_size ( = BIO size ) = 32768
> [11994.050505] drbd1: reading of bitmap took 1 jiffies
> [11994.050759] drbd1: recounting of set bits took additional 0 jiffies
> [11994.050780] drbd1: 0 KB marked out-of-sync by on disk bit-map.
> [11994.050819] drbd1: Marked additional 196 MB as out-of-sync 
> based on AL.
> [11994.066857] drbd1: disk( Attaching -> Negotiating )
> [11994.066942] drbd1: Writing meta data super block now.
> [11994.067332] drbd1: conn( Connected -> WFBitMapT )
> [11994.067358] drbd1: Writing meta data super block now.
> [11994.079356] drbd1: conn( WFBitMapT -> WFSyncUUID )
> [11994.090853] drbd1: conn( WFSyncUUID -> SyncTarget ) disk( 
> Negotiating 
> -> Inconsistent )
> [11994.090895] drbd1: Began resync as SyncTarget (will sync 200704 KB 
> [50176 bits set]).
> [11994.090926] drbd1: Writing meta data super block now.
> [12014.611505] drbd1: Resync done (total 20 sec; paused 0 
> sec; 10032 K/sec)
> [12014.611562] drbd1: conn( SyncTarget -> Connected ) disk( 
> Inconsistent 
> -> UpToDate )
> [12014.611601] drbd1: Writing meta data super block now.

Interesting, what method did you use to detach and which version are you
running?

-Ross

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