[DRBD-user] slow disk speed - anyone has experience with it

[Jeremy Kusnetz]

I experience the same problem, I've just upgraded to 0.6.12 and 2.4.25.
I've had this problem with all the kernel and 0.6 drbd version I've
used.  I too am using protocol B.

	-----Original Message-----
	From: drbd-user-admin at nudlaug.linbit.com
[mailto:drbd-user-admin at nudlaug.linbit.com] On Behalf Of
dhz_bf at walla.co.il
	Sent: Thursday, April 22, 2004 7:35 AM
	To: drbd-user at nudlaug.linbit.com
	Subject: [DRBD-user] slow disk speed - anyone has experience
with it
	
	
 
I am using drbd 0.6.12 under Linux 2.4.25 and I am using protocol B
between the primary and secondary.
My machine is a NFS server for a number of diskless clients.
I have encountered a speed problem that occurs sporadically on the
server.  The problem occurs while there is a lot of disk activity (I am
running a process
that is copying a part of the disk to another location).  Sometimes, the
speed of the disk diminishes considerably during such an operation.
For example, the result of the normal "hdparm -t" command is ~24 MB/s.
When the slowdown occurs, the results are reduced to 1-3 MB/s.  Of
course, this slowdown impairs considerably the use of the system.
 
Does anyone has ay experience with such a phenomenum (with drbd or
without it)?  I will appreciate any insight on the problem and
suggestion on how to fix it.
 
Thanks,
 
Doron Zifrony
BladeFusion
dhz_bf at walla.co.il


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