[DRBD-user] Concurrent local write detected! [DISCARD L]

Andreas Kurz andreas at hastexo.com
Thu Jan 19 12:39:12 CET 2012

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


Hello,

On 01/18/2012 12:39 PM, Alessandro Bono wrote:
> Hi
> 
> installing a kvm virtual machine on a drbd disk cause these logs on host
> machine
> 
> [2571736.830557] block drbd0: kvm[7083] Concurrent local write detected! [DISCARD L] new: 48981951s +32768; pending: 48981951s +32768
> [2571736.857671] block drbd0: kvm[7083] Concurrent local write detected! [DISCARD L] new: 48982015s +512; pending: 48982015s +512
> [2571736.884479] block drbd0: kvm[7083] Concurrent local write detected! [DISCARD L] new: 48982016s +3584; pending: 48982016s +3584
> [2571736.911285] block drbd0: kvm[7083] Concurrent local write detected! [DISCARD L] new: 48982023s +28672; pending: 48982023s +28672
> [2571798.062440] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 66639863s +4096; pending: 66639855s +8192
> [2571798.089232] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 66639871s +512; pending: 66639871s +512
> [2571798.116014] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 66639872s +3584; pending: 66639872s +3584
> [2571798.143110] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 66639879s +57344; pending: 66639879s +53248
> [2571932.144089] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 64914183s +24576; pending: 64914215s +65536
> [2572014.253295] block drbd0: kvm[7083] Concurrent local write detected! [DISCARD L] new: 78267975s +65536; pending: 78267975s +65536
> [2572317.294655] block drbd0: kvm[7083] Concurrent local write detected! [DISCARD L] new: 45901543s +12288; pending: 45901543s +12288
> [2572346.510458] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 64619831s +65536; pending: 64619831s +65536
> [2572402.322369] block drbd0: kvm[7082] Concurrent local write detected! [DISCARD L] new: 64818567s +61440; pending: 64818567s +61440
> [2572402.349160] block drbd0: kvm[7082] Concurrent local write detected! [DISCARD L] new: 64818687s +512; pending: 64818687s +512
> [2572402.376182] block drbd0: kvm[7082] Concurrent local write detected! [DISCARD L] new: 64818688s +3584; pending: 64818688s +3584
> [2572403.429157] block drbd0: kvm[7082] Concurrent local write detected! [DISCARD L] new: 64896055s +65536; pending: 64896055s +65536
> [2572422.493968] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 57422703s +65536; pending: 57422703s +65536
> [2572889.505644] block drbd0: kvm[7080] Concurrent local write detected! [DISCARD L] new: 75415135s +65536; pending: 75415135s +65536
> 
> on mailing list I found some reference to iscsi not on a vm directly
> installed on drbd
> 
> vm guest is a windows 2003 server r2 with virtio disk drivers

Are you using latest version of the virtio drivers and do the errors
also occur if you run the machine without them?

> vm host is an ubuntu server with kernel 2.6.38-13 and drbd 8.3.12 from git
> qemu-kvm 0.12.3+noroms-0ubuntu9.16

can you show us the options you use to start the VM ... or a "virsh
dumpxml" output

> 
> cat /proc/drbd
> version: 8.3.12 (api:88/proto:86-96)
> GIT-hash: 465da64362f0aece357e9015c50ed849e2458abd debian/changelog
> debian/control build by root at nebbiolo-dev, 2011-12-29 16:00:53

... is this the complete config? Please show us a "drbdadm dump all" and
the full "cat /proc/drbd"

Regards,
Andreas

-- 
Need help with DRBD?
http://www.hastexo.com/now

> 
> 
> cat /etc/drbd.d/r0.res
> resource r0 {
>  syncer {
>     rate 25M;
>     csums-alg sha1;
>     verify-alg sha1;
>   }
> 
>   net {
>     cram-hmac-alg "sha1";
>     shared-secret "xxxxxxxxxx";
>   }
> 
>   disk {
>     no-disk-flushes;
>     no-md-flushes;
>   }
> 
>   on ga1 {
>     device     /dev/drbd0;
>     disk       /dev/ga1/winsrv;
>     address    10.12.24.242:7788;
>     meta-disk  internal;
>   }
> 
>   on ga2 {
>     device    /dev/drbd0;
>     disk      /dev/ga2/winsrv;
>     address   10.12.24.243:7788;
>     meta-disk internal;
>   }
> 
> }
> 
> 
> Is there a workaround/solution?
> 
> thanks
> 



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