RE: [Xen-users] /home on domU

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

 

---

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of rajarshi das
Sent: 17 October 2006 16:14
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] /home on domU

Hi,

 

On SLES10, I have a separate /home partition on dom0 which is mounted read - write.

1) How do I mount a /home partition on domU? Do I need to create a file - backed VBD?

 

The second entry for disk=[ '/dev/....' ] in the sample xmexample corresponds to /usr. How do I create a entry for /home? 

 

I started by answering #2 below, but the answer here applies as well. /usr/... is almost allways read-only (unless you're instaling new applications or something), so it's feasible to mount this Read-Only across multiple domains - if the file-system is read-only by all clients, it's fine to mount it multiple times from different places, since the content isn't going to chnge ...

 

 

 

2) I created a file - backed VBD for the / partition on domU. Is it possible to mount the / (root) partition of dom0 as root partition in domU, and be able to write to it?  

 

 

Not unless your Dom0-root is an NFS-mounted "partition" (and I doubt that you'd use the word partition in that case).

 

Any read-write mounted file-system needs to have ONE AND ONLY ONE mountee - otherwise you'll end up with a crashed file-system, because there are BIG race-conditions that are cared for by locks inside the file-system driver, but if you're using two different file-system drivers with different address spaces, that isn't going to work.

 

Read-only filesystems can be mounted multiple times, and there are "special" file-systems that are capable of supporting multiple clients, but that's not your average rootfs for Dom0... It's either a case of "copy-on-write" implementations, or "cluser-file-system" [which may be COW-implementation, of course].

 

Filesystem choice is quite frequently discussed on this mailing list, so searching the archive would probably give you more answers than you can have questions...

--

Mats

 

 

Thanks in advance,

Rajarshi

---

Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users