[DRBD-user] DRBD and LVM Snapshot with 2 nodes configuration

Lars Ellenberg Lars.Ellenberg at linbit.com
Wed Apr 7 23:57:11 CEST 2004

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


> >No.  And, DBRD does not do any buffering.
> 
> Mhm ... why there is a option "-S, --sndbuf-size size", from the 
> drbdsetup man page:
> --- snip ---
> The  socket  send  buffer  is  used  to store packets sent to the 
> secondary node, which are not yet acknowledged (from a network point of 
> view) by the secondary node.

ok, so the NETWORK does some buffering.  thats a few KB.
And, with protocol B, the upper layers (file system and applications)
are only notified about "yes, block has been written", if it actually
WAS written to both physical disks.

	lge



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