[DRBD-user] DRBD is deadly slow.

[Balreddy Medipally]

Hi,
 
   Actually these servers are in 1GBPS local LAN only and H/W is also same for both the servers.
 
IBM xserver 3650 M2, 8GB RAM, 2x Intel Xeon Processors, 300GBx4 SAS HDD, RAID 5, 1GBPSx2 NIC's.
 
MySQL5.1.42 Advanced version
Please suggest on this.
 
Thanks,
BalReddy

________________________________

From: James Perry [mailto:jperry at mezeo.com]
Sent: Tue 3/30/2010 7:18 PM
To: PN
Cc: Balreddy Medipally; drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] DRBD is deadly slow.


Read this! 

http://www.drbd.org/users-guide/s-configure-syncer-rate.html

On Mar 30, 2010, at 8:35 AM, PN wrote:


	Try to increase the syncer rate to a much higher number and restart DRBD on both nodes will definitely help to increase the sync speed.
	
	PN
	
	
	
	
	2010/3/30 Balreddy Medipally <balreddy.m at imimobile.com>
	

		 Hi All,
		
		       I am running DRBD 8.3.0 on RedHat Enterprise Linux AS 4.8 64-bit
		OS for production purpose. MySQL works superfast in when load was not
		there, when load was there it become deadly slow. Can any one please
		help me to make it faster.
		
		Here is my drbd.conf file.
		
		[root at imi-drbd1 ~]# cat /etc/drbd.conf
		resource drbd0 {
		protocol C;
		startup {
		become-primary-on both;
		}
		net {
		allow-two-primaries;
		cram-hmac-alg sha256;
		shared-secret DRBD2KVM123456;
		after-sb-0pri discard-least-changes;
		after-sb-1pri violently-as0p;
		after-sb-2pri violently-as0p;
		rr-conflict violently;
		}
		syncer {
		rate 44M;
		}
		
		on imi-drbd1 {
		        device           /dev/drbd0;
		        disk             /dev/sda2;
		        address          ipv4 192.168.168.1:7768 <http://192.168.168.1:7768/> ;
		        meta-disk        internal;
		}
		on imi-drbd2 {
		        device           /dev/drbd0;
		        disk             /dev/sda2;
		        address          ipv4 192.168.168.2:7768 <http://192.168.168.2:7768/> ;
		        meta-disk        internal;
		       }
		}
		[root at imi-drbd1 ~]#
		
		Thanks,
		BalReddy.
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	-- 
	Best Regards,
	PN Lai
	Storage Manager / HPC Specialist
	Galactic Computng Corp.
	Tel: 86-755-26733939 ext 826
	Mobile: 86-13823161729 / 852-60333151
	Fax: 86-755-26733780
	URL: http://www.galactic.com.hk <http://www.galactic.com.hk/> 
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James Perry
Principal Consultant
Mezeo Software
t: 713.244.0859
f: 713.244.0851
m: 713.444.0251


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