[DRBD-user] can drbd be made to detect that it has failed to write to the underlying device in a 'long time'?

Todd Denniston Todd.Denniston at ssa.crane.navy.mil
Thu Apr 15 21:29:58 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.


Lars Ellenberg wrote:
> 
<SNIP>
> Hm.
> If the Secondary manages to get a "throughput" of more than one block
> per (ko-count*ping-intervall), we do not disconnect. If it "even"
> manages to get >= (4k) per ping intervall, ko-count won't trigger at all.
> 
> So a "very slow" but "not slow enough" write throughput on the Secondary
> will throttle the Primary to the same slowness.
> 
> On the Primary, if it still is responsive, try to watch the "ns:".
> If it still increases, this is what happens.
> 

Today the card reported an error at 12:54:20, and I had some data trapped.
seems after the secondary latched, the primary thought ti snuck in another 37
blocks...
Also seems a little weird that the Primary pe: does not match the Secondary
ua:, am I just reading something into the relationship there?


On the Primary I see:
Thu Apr 15 12:53:08 EST 2004
1: cs:Connected st:Primary/Secondary ns:916069744 nr:0 dw:14160120
dr:1124968985 pe:2 ua:0
Thu Apr 15 12:53:18 EST 2004
1: cs:Connected st:Primary/Secondary ns:916070324 nr:0 dw:14160700
dr:1124969025 pe:0 ua:0
Thu Apr 15 12:53:28 EST 2004
1: cs:Connected st:Primary/Secondary ns:916072940 nr:0 dw:14163316
dr:1124969045 pe:101 ua:0
<SNIP>
Thu Apr 15 12:53:58 EST 2004
1: cs:Connected st:Primary/Secondary ns:916073088 nr:0 dw:14163468
dr:1124969045 pe:138 ua:0
<SNIP>
Thu Apr 15 12:54:38 EST 2004
1: cs:Connected st:Primary/Secondary ns:916073088 nr:0 dw:14163468
dr:1124969045 pe:138 ua:0
Thu Apr 15 12:54:48 EST 2004
1: cs:StandAlone st:Primary/Unknown ns:916073088 nr:0 dw:14164676
dr:1124969045 pe:0 ua:0
Thu Apr 15 12:54:58 EST 2004
1: cs:StandAlone st:Primary/Unknown ns:916073088 nr:0 dw:14165564
dr:1124972281 pe:0 ua:0

And on the secondary:
Thu Apr 15 12:52:55 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241233272 dw:241233272 dr:0 pe:0
ua:0
Thu Apr 15 12:53:05 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241233376 dw:241233376 dr:0 pe:0
ua:0
Thu Apr 15 12:53:15 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241234352 dw:241234352 dr:0 pe:0
ua:0
Thu Apr 15 12:53:25 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241236948 dw:241236948 dr:0 pe:0
ua:96
Thu Apr 15 12:53:35 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241236948 dw:241236948 dr:0 pe:0
ua:96
Thu Apr 15 12:53:45 EST 2004
<SNIP>
Thu Apr 15 12:56:05 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241236948 dw:241236948 dr:0 pe:0
ua:96
Thu Apr 15 12:56:15 EST 2004
1: cs:Connected st:Secondary/Primary ns:0 nr:241236948 dw:241236948 dr:0 pe:0
ua:96
<Log Ends>

-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane) 
Harnessing the Power of Technology for the Warfighter



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