[Ocfs-devel] Re: [Ocfs-users] OCFS 1.0.9-6 performance with EVA 6000 Storage

[Sunil Mushran]

Heartbeating in ocfs is currently per volume. The nmthread reads 36
sectors and writes 1 sector every second or so. The io in vmstat you see
is due to heartbeat.

As far as the mount is concerned, the mount thread waits for the
nmthread the stabilize, 10 secs or so.

We are working on making the heartbeat configurable. 1.0.12 will have
some stuff regarding that.... hb and timeout values. It will not be
activated by default. We are still working out the details. That will
reduce the hb related io.

If you want to use 51 mounts, make sure your hardware can handle the io.
For e.g., if you see ocfs msgs like, "Removing nodes" and "Adding nodes"
without a node performing any mount/umount, you have a problem. In
anycase, you should use 1.0.11 at the least. In 1.0.10, we doubled the
timeout from 1.0.9.

Hope this helps.
Sunil

On Tue, 2004-06-01 at 18:04, Jeram wrote:
> Dear All...
> 
> I need some information regarding OCFS performance in my Linux Box, herewith
> is my environment details :
> 1. We are using RHAS 2.1 with kernel 2.4.9-e.27 Enterprise
> 2. OCFS version : 2.4.9-e-enterprise-1.0.9-6
> 3. Oracle RDBMS : 9.2.0.4 RAC with 5 Nodes
> 4. Storage = EVA 6000 with 8 TB SIZE
> 5. We have 1 DiskGroup and 51 LUNs configured in EVA6000.
> My Question is :
> 1. It takes arround 15 minutes to mount arround 51 ocfs file system, is this
> a normal situation?
> 2. I monitor the OS using VMSTAT without starting the RAC server, column IO
> (bo and bi) it's giving 3 digits value continuously, then I unmount all the
> OCFS filesystem, again monitor the IO using VMSTAT,  column IO (bo and bi)
> it's giving 1 digits value, any idea why this is happen?
> I have raised this issue to HP engineers who provide the HW, have not got
> the answer yet.
> Thanks in advance
> Rgds/Jeram  
>  
> 
> 
> 
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