Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
One or more of these parameters in drbd.conf increased performance
to the expected values, i am satisfied so far and will investigate
later. Maybe it was the sie of 5.6 Terrabytes that made the
drbd disk that slow ?
disk {
...
no-disk-flushes;
no-md-flushes;
no-disk-barrier;
}
On Tue, Feb 10, 2009 at 01:18:03PM +0100, Christoph Adomeit wrote:
>
> Hi,
>
> I have setup a new node to be a drbd primary.
>
> Later on I will have a secondary but that hardware is not even
> delivered to us. However, I wanted to finish the final configuration
> of the primary node now.
>
> So I have setup only a primary drbd setup of lvm above drbd, which works
> good. Filtered the disk sdb in lvm.conf for not getting
> lvm to use /dev/sdb instead of /dev/drbd0. Drbd is in standalone mode now.
>
> However, drbd is terribly slow, that server makes 300 MB/s writes
> on local disk but on top of drbd only 3 MB/s.
>
> /proc/drbd says:
> version: 8.3.0 (api:88/proto:86-89)
> GIT-hash: 9ba8b93e24d842f0dd3fb1f9b90e8348ddb95829 build by root at san01,
> 2009-02-09 16:18:25
> 0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r---
> ns:0 nr:0 dw:1350856 dr:1084 al:926 bm:669 lo:3 pe:0 ua:0 ap:2 ep:1
> wo:b oos:5819396636
>
> kernel 2.6.27-11-server from ubuntu, drbd 8.3 hand compiled by me.
>
> drbd.conf: nothing special
> resource san01cluster {
> protocol B;
> startup {
> wfc-timeout 10;
> degr-wfc-timeout 20;
> }
> disk { on-io-error detach; }
> syncer {
> rate 300M;
> }
>
> on san01 {
> device /dev/drbd0;
> disk /dev/sdb;
> address 10.65.1.10:7891;
> meta-disk internal;
> }
> on san02 {
> device /dev/drbd0;
> disk /dev/sdb;
> address 10.65.1.11:7891;
> meta-disk internal;
> }
> }
>
>
> root at san01:~# pvdisplay
> --- Physical volume ---
> PV Name /dev/drbd0
> VG Name vg0
> PV Size 5,42 TB / not usable 540,00 KB
> Allocatable yes
> PE Size (KByte) 4096
> Total PE 1420751
> Free PE 1395151
> Allocated PE 25600
> PV UUID
> ul9Xjf-6nET-zUb2-b1my-Qb7M-02t8-Ai4CpO
>
> lvdisplay
>
> root at san01:~# lvdisplay
> --- Logical volume ---
> LV Name /dev/vg0/images
> VG Name vg0
> LV UUID aewpzg-cMiC-cFVA-kBGi-2vMW-10Gz-LMs9Mu
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 100,00 GB
> Current LE 25600
> Segments 1
> Allocation inherit
> Read ahead sectors auto
> - currently set to 256
> Block device 254:0
>
>
> writes to /dev/vg0/images ares slow, while writes to sda1, the root
> filesystem are fast, tested with bonnie++
>
> Any idea what might be the reason for the server being so slow ?
>
> --
> Christoph Adomeit
> GATWORKS GmbH
> Reststrauch 191
> 41199 Moenchengladbach
> Sitz: Moenchengladbach
> Amtsgericht Moenchengladbach, HRB 6303
> Geschaeftsfuehrer:
> Christoph Adomeit, Hans Wilhelm Terstappen
>
> Christoph.Adomeit at gatworks.de Internetloesungen vom Feinsten
> Fon. +49 2166 9149-32 Fax. +49 2166 9149-10
> --
> Christoph Adomeit
> GATWORKS GmbH
> Reststrauch 191
> 41199 Moenchengladbach
> Sitz: Moenchengladbach
> Amtsgericht Moenchengladbach, HRB 6303
> Geschaeftsfuehrer:
> Christoph Adomeit, Hans Wilhelm Terstappen
>
> Christoph.Adomeit at gatworks.de Internetloesungen vom Feinsten
> Fon. +49 2166 9149-32 Fax. +49 2166 9149-10
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
--
Christoph Adomeit
GATWORKS GmbH
Reststrauch 191
41199 Moenchengladbach
Sitz: Moenchengladbach
Amtsgericht Moenchengladbach, HRB 6303
Geschaeftsfuehrer:
Christoph Adomeit, Hans Wilhelm Terstappen
Christoph.Adomeit at gatworks.de Internetloesungen vom Feinsten
Fon. +49 2166 9149-32 Fax. +49 2166 9149-10