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

dhz_bf at walla.co.il dhz_bf at walla.co.il
Thu Apr 22 13:35:18 CEST 2004

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


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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