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Re: [gNewSense-users] Mounting/partitioning inside a VM

From: Kim Hawtin
Subject: Re: [gNewSense-users] Mounting/partitioning inside a VM
Date: Tue, 24 Apr 2012 11:28:34 +0930
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20120207 Icedove/3.0.11

On 21/04/12 19:08, Stayvoid wrote:
Perhaps the first question is, why do you want to slice up the file
system in this way?

I would consider it unusual to split off /tmp, /var, /var/tmp and
/var/mail in this way unless you were shifting a very large amount of mail.
I use this guide:

And then to separate disks, not all on the same volume/disk.
Because I can't access the disk via fdisk or parted. I'll investigate
this, but AFAICT it's a VPS specific issue.
So the only option I have is to use several disks. I assume those are
not separate in a physical sense.

If you can't use fdisk to label partitions, how are you adding these filesystems?

Are you running mke2fs on the raw disk device?

As you seem to be running a Xen VM, I would expect you are not going to
get a performance increase. It makes it much more likely that one of
these file systems is going to fill and halt which ever process that
doing the work in that file system.
I'm trying to secure the system, not to get a perf boost. Let me know
If I can achieve both.

You are running on a VPS.

Performance is not an option.

So keep it simple, otherwise it will be a complete arse to restore from backup.

Ok, for each new file system you will have to migrate them from the
'root' disk/partition to the new disk/partition.

    2) mount each file system, eg under /tmp
    3) copy the data from the 'root' file system to the new one
       eg rsync -av /tmp/ /mnt/
    4) unmount the file system from /mnt
This sounds strange. I will use my data if I unmount it. Is this correct?

No you will not lose the data. its on the new file system. which you then mount again in the right place.

Maybe I should do the following:
What do you think? Will it work?
How to separate /var/mail from /var in this case?

Your idea of fresh disk is meaningless on a VPS. Short of making the collective file systems *larger*, there is no net gain, IMHO.

With a VPS you have to balance up the trade off between complexity and degrading performance. Adding more file systems degrades performance as memory usage only goes up. Even if you don't have much data in those file systems.

Why are you *actually* trying to do and why?



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