topic Re: HP Storage Works 2000 - HP MAS Storage in Operating System - Linux

HP Storage Works 2000 - HP MAS Storage

WW288996 — Wed, 15 Jul 2009 12:21:44 GMT

Hi,

We are using HP MAS Storage and we are mounting luns using iscsi.

Curently we have a problem which is described below,

We are mounted this iscsi storage in one of our linux server(server1). mount device it shows on server1 is sdd1 and we mounted to /test in server1.

And we also mounted the same storage in another server(server2) as /test.

But we could not able to see the changes happening one mount to another.
For example if I create a file in server1:/test mount it is not reflecting on server2:/test .

To see the file currently I am restarting the iscsi daemon and re-mounting the same to server2.

Please help me in this regard.

Is there any command/utility which will reflect the cahnges in storage on all servers dynamicaly.

Kindly please suggest on this.

Thanks in advance.

Re: HP Storage Works 2000 - HP MAS Storage

marsh_1 — Wed, 15 Jul 2009 12:28:05 GMT

hi,

if you try to share devices with two or more systems you need to have either a cluster file system in place or some other shared filesystem such as polyserve. if you do not do this you risk corruption to your data.

hth

Re: HP Storage Works 2000 - HP MAS Storage

WW288996 — Wed, 15 Jul 2009 12:30:09 GMT

Can I have this in my server.

If so please tell me how can I achieve this?

Re: HP Storage Works 2000 - HP MAS Storage

TTr — Wed, 15 Jul 2009 13:02:49 GMT

What you created is a very bad setup. Each server will modify the filesystem structure independently of the other server and you immediatelly have a corrupt unusable filesyste and loss of data.

>Can I have this in my server. If so please tell me how can I achieve this?

You need to buy and install very expensive software to your servers to achieve this.

Re: HP Storage Works 2000 - HP MAS Storage

WW288996 — Wed, 15 Jul 2009 13:12:53 GMT

server1 is RHEL4 and server2 is RHEL5

storage formatted from RHEL4 with ext3 filesystem.

What is the way where I can see changes happening on both the server.

Re: HP Storage Works 2000 - HP MAS Storage

marsh_1 — Wed, 15 Jul 2009 13:29:26 GMT

hi,

there are a number of options , try a google search on linux cluster and linux shared filesystem.

fwiw

Re: HP Storage Works 2000 - HP MAS Storage

marsh_1 — Wed, 15 Jul 2009 14:06:54 GMT

hi,

do you need access from both systems in real time ? would a snapshot or regular snapshots be sufficient for your needs ?

Re: HP Storage Works 2000 - HP MAS Storage

WW288996 — Thu, 16 Jul 2009 04:04:41 GMT

Yes I need to access this storage from both systems in real time.

from server1 I will copy some files which should reflect in server2 also. Because these files are used by machines who have access to server2.

Re: HP Storage Works 2000 - HP MAS Storage

Patrick Terlisten — Thu, 16 Jul 2009 04:48:42 GMT

Hello,

if you're using RHEL try GFS2 as cluster file system.

http://sources.redhat.com/cluster/gfs/

Hope this helps.

Best regards,
Patrick

Re: HP Storage Works 2000 - HP MAS Storage

WW288996 — Thu, 16 Jul 2009 04:55:59 GMT

If I format my storage with cluster filesystem(GFS) will it work like as ext3.

All my files are currently on ext3 filesystem.

please suggest.