I found out, that there must be a coherency between GFS access speed and
network bandwidth allthough i/o is going through FC to the RAID in my
4-node cluster.
It is 4 nodes each redundantly connected by 4GB-FC to the two
controllers of a FC-to-FC RAID System.
Devices are accessed through multipath-tools' /dev/mapper devices on the
primary path.
Each node has 1 100BaseT and 2 1000BaseTX network interfaces.
Before installing the cluster I did some performance tests such as
writing from /dev/zero to the RAID containing an XFS file system and now
with a GFS on it.
Here are some numbers:
FS heartbeat-network access-speed latency
----------------------------------------------------------
GFS 10MBit/s 50MB/s very high
GFS 100MBit/s 66MB/s high
GFS 1000MBit/s 100MB/s low
XFS 260MB/s none
What does GFS do over network when it is accessed by a node.
Does dlm use such a high network bandwith before the first bit is
written through FC to the RAID?
I had a VM on VMWare Server running on GFS that was interrupted every 10
seconds for one ore two seconds.
Now with 1000MBit/s it is not interrupted any more. But do not want to
waste more than 60% of our RAID's performance.
What can I do to speed up GFS?
Hope you have an idea.
Best regards
Christian
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