[Linux-cluster] GFS2 for multimedia

[Brieseneck, Arne, VF-Group]

Hi Rabeeh,

In your case I would not go for GFS2. What you describe sounds like a
NFS solution to me. 
You don't need the overhead of a cluster filesystem when only one system
is directly connected to the disk(s)

On the other hand it would be much easier to implement.


Best Regards,
Arne

-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Rabeeh Khoury
Sent: Montag, 9. Juli 2007 23:16
To: linux-cluster at redhat.com
Subject: [Linux-cluster] GFS2 for multimedia

Hi All,

I would like to consult with you guys the usage GFS2 for home multimedia
usage.

Clearly GFS2 is intended for enterprise system and the following is not
where it was meant to be. But for the sake of the discussion -

The systems are 4 ARM based system every one running at 200MHz (low-end
systems) where on the master system a local SATA HDD /dev/sda and the
other 3 are connected to the master system via iSCSI running all GFS2
with DLM using Ethernet.

The details are as following -
1. Master system writes concurrently to 8 files and has 8 (files) x
10Mbps = 80Mbps (Mega bit per second) files write and 1 x 40Mbps file
read 2. The slaves has 3 (systems) x 1 (file per system) x 40Mbps =
120Mbps total file read from the master 3. Every I/O to the files are
all with O-direct, bypassing Linux cache buffer but GFS2 mounted to
cache D-entry etc...
4. There might be cases of single writer and multiple readers, and cases
of write only.
5. The slaves and master are in consumer home environment where shutting
down (gracefully or by force) is a common scenario.
6. Assume ARM CPUs have enough headroom for handling the required
workload, especially the master system.

The questions -
1. What are the risks and things can be missed in such environment?
2. Any idea if someone tried this before?
3. Other thoughts, suggestions, recommendations and ideas?

Regards,
Rabeeh


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