On Jul 27, 2009, at 4:09 PM, Coert Waagmeester <lgro...@waagmeester.co.za
> wrote:
On Mon, 2009-07-27 at 12:37 +0200, Coert Waagmeester wrote:
On Mon, 2009-07-27 at 12:02 +0200, Alexander Dalloz wrote:
On Mon, 2009-07-27 at 08:30 +0200, Coert Waagmeester wrote:
Hello Roman,
I am running drbd 8.2.6 (the standard centos version)
have you considered to test the drbd-8.3 packages?
http://bugs.centos.org/view.php?id=3598
http://dev.centos.org/centos/5/testing/{i386,x86_64}/RPMS/
Thank you very much for this tip! It was one very obvious place
where I
did not look yet.
Would it be necessary to still recompile it for the TCP_NODELAY and
such?
I am just making sure, because
http://www.nabble.com/Huge-latency-issue-with-8.2.6-td18947965.html
makes it seem unnecessary.
Why do the repositories provide both DRBD 8.0.x and 8.2.6?
Here is a status update....
_______________________________________________________________________________
on both hosts I now run from the testing repository:
# rpm -qa | grep drbd
drbd83-8.3.1-5.el5.centos
kmod-drbd83-xen-8.3.1-4.el5.centos
_______________________________________________________________________________
Here is my config (slightly condensed):
-----------------------------------------------------
global {
usage-count yes;
}
common {
protocol C;
syncer { rate 50M; }
net {
# allow-two-primaries; }
sndbuf-size 0; }
# disk {no-disk-flushes;
# no-md-flushes; }
startup { wfc-timeout 0 ; }
}
resource xenfilesrv {
device /dev/drbd1;
disk /dev/vg0/xenfilesrv;
meta-disk internal;
on baldur.mydomain.local {
address 10.99.99.1:7788;
}
on thor.mydomain.local {
address 10.99.99.2:7788;
}
}
resource xenfilesrvdata {
device /dev/drbd2;
disk /dev/vg0/xenfilesrvdata;
meta-disk internal;
on baldur.mydomain.local {
address 10.99.99.1:7789;
}
on thor.mydomain.local {
address 10.99.99.2:7789;
}
}
_______________________________________________________________________________
xenfilesrv is a xen domU
in this domU i ran a dd with oflag direct:
---------------------------------------------------------
# dd if=/dev/zero of=1gig.file bs=1M count=1000 oflag=direct
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 147.997 seconds, 7.1 MB/s
Just before I ran the dd this popped up in the secondary hosts syslog:
----------------------------------------------------------------------
Jul 27 21:51:42 thor kernel: drbd2: Method to ensure write ordering:
flush
Jul 27 21:51:42 thor kernel: drbd1: Method to ensure write ordering:
flush
_______________________________________________________________________________
What more can I try?
To be quite honest, I have no idea what to do with/ where to find the
TCP_NODELAY socket options......
Use drbd option to disable flush/sync, but understand that during a
power failure or system crash data will not be consistent on disk and
you will need to sync the storage from the other server.
-Ross
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