From: Alan McKinnon <alan.mckinnon@gmail.com>
To: Pandu Poluan <pandu@poluan.info>, gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] bindmount or symlink?
Date: Tue, 13 Mar 2012 13:38:39 +0200 [thread overview]
Message-ID: <20120313133839.48022a23@khamul.example.com> (raw)
In-Reply-To: <CAA2qdGVAK2GcZs34CGd+dk6Q5QefJnnkjHOjA3dvSVxjH903eQ@mail.gmail.com>
On Tue, 13 Mar 2012 16:00:08 +0700
Pandu Poluan <pandu@poluan.info> wrote:
> On Tue, Mar 13, 2012 at 15:15, Canek Peláez Valdés <caneko@gmail.com>
> wrote:
> >
> > You are; but in an incredible complicated and convulted way.
> >
> > If I'm understanding you, you want:
> >
> > fstab:
> > /dev/XX /mnt/p1 ...
> > /dev/YY /mnt/p2 ...
> >
> > and then
> >
> > /usr/portage -> /mnt/p1
> > /usr/src -> /mnt/p2
> >
> > (or using bindmounting, whatever).
> >
> > This makes no sense at all (at least not to me), when you can
> > simply:
> >
> > fstab:
> > /dev/XX /usr/portage ...
> > /dev/YY /usr/src ...
> >
> > and get the same split filesystem, but without all the complication
> > you are proposing.
> >
> > Unless there is something I don't understand, in which case I'm not
> > following your reasoning.
> >
>
> The point is: It's not just 2 (two) directories, but several of them,
> and I just can't see myself creating a partition (or an LV) for each
> and everyone of them.
>
> So, here's my thoughts:
>
> There are 2 filesystems that are suitable for different purposes:
> * reiserfs = for space efficiency (w/o notail option) and/or no inode#
> limitation
> * ext4 = for general purpose
>
> The directories I'm going to split:
>
> /usr/share ==> ext4
> /usr/portage ==> reiserfs
> /usr/portage/packages ==> ext4
> /usr/portage/distfiles ==> ext4
> /usr/src ==> reiserfs
> /var/cache/rtorrent (don't ask) ==> reiserfs
> /var/spool/postfix ==> ext4
> /var/lib/postgresql ==> ext4
>
> Now, I create 2 partitions:
>
> /dev/sdc1 (reiserfs) --> /mnt/Persistent1
> /dev/sdd1 (ext4) --> /mnt/Persistent2
>
> Then I create subdirectories:
>
> /mnt/Persistent1/portage
> /mnt/Persistent1/src
> /mnt/Persistent1/rtorrent
>
> /mnt/Persistent2/share
> /mnt/Persistent2/packages
> /mnt/Persistent2/distfiles
> /mnt/Persistent2/postfix
> /mnt/Persistent2/postgresql
>
> Finally, I need to redirect the directories-I-want-to-split to the
> above subdirs under /mnt/Persistent[12]
>
> SO.
>
> mount -o bind ... or ln -s ?
>
> Rgds,
Ah, now I see. You have many sub-directories of /usr that you don't
want to be part of the same volume as /usr. This is quite valid, I can
think of several lines of reasoning:
- you'd rather not have the pain of dealing with many smaller
filesystems even if LVM is available.
- you just want a large storage area for "stuffs", and don't feel like
finding out how much space each one needs
- you'd rather keep the bulk of /usr static and don't growing much
So instead make two big mount points in /mnt, one each for the
destination filesystem types you are interested in and link the
subdirectories there to the right place in /usr.
You want bindmounts for that.
Someone else here (I forget whom) did the same thing with his home
directories and /var. It's a valid need, but rare. And nobody else
understood his reasoning for a long time either :-)
OT: I can't wait for the day when ZFS- and btrfs-like filesystems are
the norm and we can dispense with all this physical disk, partitions,
LVM, volumes, file systems and mounting nonsense.
I want this model: I have X bytes of storage, I would like Y bytes to
be mounted here with these charactertics, and Z bytes mounted there
with those characteristics. Kernel, make it so, thanksverymuch and
have a nice day
--
Alan McKinnnon
alan.mckinnon@gmail.com
next prev parent reply other threads:[~2012-03-13 11:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 5:04 [gentoo-user] bindmount or symlink? Pandu Poluan
2012-03-13 5:11 ` Canek Peláez Valdés
2012-03-13 5:39 ` Pandu Poluan
2012-03-13 5:45 ` Canek Peláez Valdés
2012-03-13 6:59 ` Alan McKinnon
2012-03-13 8:05 ` Pandu Poluan
2012-03-13 8:15 ` Canek Peláez Valdés
2012-03-13 8:52 ` Philipp Riegger
2012-03-13 9:00 ` Pandu Poluan
2012-03-13 9:12 ` Canek Peláez Valdés
2012-03-13 10:35 ` Nilesh Govindrajan
2012-03-13 11:38 ` Alan McKinnon [this message]
2012-03-13 10:58 ` Alan McKinnon
2012-03-13 18:06 ` Walter Dnes
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