Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
>>>in drbd: >>>you could play with "unplug-watermark" and "max-epoch-size" (and >>>possibly max-buffers). >>>when I say "play", I mean it. it could get better if you increase, >>>it could get better when you decrease, it could get better if you >>>adjust in opposite directions (where possible), and it could happen to >>>have no noticable effect at all, which is all very dependent on your >>>lower level io subsystem and on network timings and ... >> >>I know, than I can play with them, but there is another strange thing. When I disconnect secondary node(shutdown >>heartbeat, and drbd) I get lags also. Also I don't have much traffic on database(1256 writes per minute - so I's >>20KB per seconds, and only a few reads per minute), so playing with "net" parameters is not necessary in my case. I >>think that it is drbd bug or some stupid thing :) > > > what about al-extends? I have play with it(increase and decrease one) without positive results :( > how often do the bm: and al: numbers increase in /proc/drbd? > (watch -n1 cat /proc/drbd, and look at that) They don't change often, only a few single(+1) increases per hour. al-extends, and all "net", "syncer" directives have only sense when there is another node. When I only leave one node(primary) I still have laga. And it is strangest thing to me. It is x86_64 HA Cluster, but I have the same hardware in another location and there are no problems. Strange :)