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

[Magnus Lubeck]

Jeram: One question:

15 minutes, is that the time it takes to mount ALL 51 LUNs on ALL hosts (i.e
255 mounts), or is it for ONE node to mount 51 LUNs when all other hosts
have already mounted the LUNs?

There is a big difference when it comes to calculate availability. Usually
one does not have a BIG crash, requiering all nodes to be rebooted at the
same time.

How long does it take to mount the 51 LUNs on One box alone (with all others
already mounted)?

Best,
//magnus

-----Ursprüngliche Nachricht-----
Von: ocfs-users-bounces at oss.oracle.com
[mailto:ocfs-users-bounces at oss.oracle.com] Im Auftrag von Jeram
Gesendet: Mittwoch, 2. Juni 2004 03:34
An: Wim Coekaerts
Cc: ocfs-users at oss.oracle.com
Betreff: RE: [Ocfs-users] OCFS 1.0.9-6 performance with EVA 6000 Storage

Hi Wim...

Thanks for your quick respons, what is the best way to reduce the IO
Contention in my environment?
I start the LINUX Box one by One...if i start all the 5 nodes in parallel it
will give IO error....so for 51 LUNs it takes arround 15 minutes to get
complet.
Please advice...

Rgds/Jeram

-----Original Message-----
From: Wim Coekaerts [mailto:wim.coekaerts at oracle.com]
Sent: Wednesday, June 02, 2004 8:21 AM
To: Jeram
Cc: ocfs-users at oss.oracle.com; ocfs-devel at oss.oracle.com
Subject: Re: [Ocfs-users] OCFS 1.0.9-6 performance with EVA 6000 Storage


yeah it takes a long time, but you should be able to mount in parallel

you do one by one, you know how long it takes to mount one, so just time
51

also, iowait being high with 51 volumes and notihng running means that
you have bad io throughput, we have a customer tha thas more and has
Zero problems, but they have ons of hba's and tons of physical arrays
you probably end up exhausting the device queue if you only have 1

in 1.0.12 there will be a way to reduce the heartbeat to a few seconds
instead of 2 per second

Wim

On Wed, Jun 02, 2004 at 08:04:26AM +0700, 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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> Ocfs-users at oss.oracle.com
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