[DRBD-user] /proc/drbd, 5th flag, "d"

Marcelo Pereira marcelops at gmail.com
Mon Feb 4 23:44:48 CET 2013

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

Hello Everyone,

I just noticed a flag on one of the DRBD resources, as shown below:

> [ /]# cat /proc/drbd
> version: 8.3.13 (api:88/proto:86-96)
> GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 build by dag at Build64R6,
> 2012-05-07 11:52:13
>  0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
>     ns:2081916088 nr:520248 dw:2082436336 dr:1001913178 al:1585314 bm:132 lo:0
> pe:0 ua:0 ap:0 ep:1 wo:b oos:0
>  1: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r---d-
>     ns:1035652 nr:0 dw:1035652 dr:7682 al:270 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1
> wo:b oos:0

The DRBD manual says about the "d" on the 5th flag:

> Locally blocked I/O. Normally. May be one of the following flags:
>     d: I/O blocked for a reason internal to DRBD, such as a transient disk
> state.

I have checked the logs (/var/log/messages), and there is nothing there from

There server is running on:
* CentOS 6.3
* Kernel 2.6.32-220
Any suggestion on how to find out what is causing that flag to be up?



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