Shared Storage

[abhishek456]

Hi everyone,

I had a setup which consists of two linux devices with a shared storage.

Application on linux device needs to write to shared disks, and changes made on shared disk from one linux machine should immediately be visible to other linux machine

i made fstab entry for shared disk as fallows

/dev/sdb1   /mnt/share   ext3   rw,suid,dev,exec,auto,users,sync   1  1

i am assuming that sync will immediately push data to harddisk with out storing data in cache, so that changes will be visible on other linux machine immediately.

But i cannot achieve required things by doing as above

Changes are visible if i un-mount and re-mount hard disk again

Can anyone help me in resolving this issue.

Thanking in advance

[Irithori]

ext3 is *not* meant to be used on a shared storage.
This setup *will* lead to corrupted data.

- Apart from cluster file systems such as Global File System 2 ,
- you could go for a "network raid" with DRBD
- or try the inotify way in userspace via Lsyncd

[abhishek456]

ext3 is *not* meant to be used on a shared storage.
This setup *will* lead to corrupted data.

- Apart from cluster file systems such as Global File System 2 ,
- you could go for a "network raid" with DRBD
- or try the inotify way in userspace via Lsyncd

thanks Irithori for your quick reply

i will try ur suggestion tomorrow and update result

[abhishek456]

hi

According to requirement i had installed RHEL-6 on server. On top of it i installed KVM hypervisor and then installed two RHEL virtual machines. I need a shared storage which can serve both virtual machines. Virtual machines will do both read and write operations.

Can anyone suggest me how to make setup for shared storage.

Do i need to setup NFS for this or can i make it with normal hard disk

[Irithori]

Can you explain in detail, what kind of data needs to be on both VMs?

As IO is one of the most common bottlenecks anyway, it usually pays to sync data to multiple spindles,
instead of concentrating multiple VMs on one..

[abhishek456]

Can you explain in detail, what kind of data needs to be on both VMs?

As IO is one of the most common bottlenecks anyway, it usually pays to sync data to multiple spindles,
instead of concentrating multiple VMs on one..

oracle application will be writing some files on to shared storage

but as it's just a lab setup i made simple setup and i think there will not be much of disk activity.

data written by one oracle application from virtual machine on shared storage need to be accessed by oracle application on other virtual machine and vice-verse

[Irithori]

RAC comes to mind
RAC Documentation

[abhishek456]

RAC comes to mind
RAC Documentation

thanks irithori, url helps