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

Marcelo Pereira marcelops at gmail.com
Wed Feb 6 05:12:51 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.


Hi Lars,

Thanks for your message!

The IO is not blocked. It is in fact working properly.

I just noticed the flag and was trying to find out what that means, and how
to fix it.

Thanks,

--Marcelo



On Tue, Feb 5, 2013 at 3:53 AM, Lars Ellenberg <lars.ellenberg at linbit.com>wrote:

> On Mon, Feb 04, 2013 at 05:44:48PM -0500, Marcelo Pereira wrote:
> > 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.
>
> Is IO in fact blocked?
> Or are you just worrying about that flag in /proc/drbd ?
>
> We cache the result of our drbd_congested() hook whenever it is called
> by the VM subsystem or generic writeout path, or the like.
> We used to not reset that information actively.
> So it reset only when "someone" called into that hook again later.
>
> This means that flag may display stale information /proc/drbd.
> Fixed in 8.3.14 and above.
>
>         Lars
>
> > I have checked the logs (/var/log/messages), and there is nothing there
> from
> > DRBD.
> >
> > 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?
> >
> > Thanks,
>
>
> --
> : Lars Ellenberg
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com
>
> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
> __
> please don't Cc me, but send to list   --   I'm subscribed
>
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