zuzu on 14 Feb 2009 11:41:41 -0800

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Re: [PLUG] "pooled" storage

On Sat, Feb 14, 2009 at 1:06 PM, Mag Gam <magawake@gmail.com> wrote:
> This is more of a theoretical question.
> The advantage of pooled storage is it makes more efficient use of
> physical storage versus logical volume model. I was wondering if there
> is a filesystem technique with symbolic links which can emulate a
> pooled storage model similar to ZFS.

Yeah, I wish Linux had ZFS support for real instead of through FUSE
too.  (I think that's what you're saying, anyway.  Years ago Sun
promised to _eventually_ GPL OpenSolaris including ZFS; they were busy
GPL'ing Java first though.)

Infrant/Netgear Network Attached Storage (NAS) has X-RAID, and the
Drobo has BeyondRAID, which are like RAID-5 but dynamic to number of
disks.  I think the Infrant/Netgear ReadyNAS actually runs Linux, so
I'd be curious if X-RAID has been ported out into mainstream

There's also Venti/Fossil from Plan9 that I think has been ported to Linux.

> I was thinking of something like in this line, have x amount of
> physical filesystems:
> /physical/disk0
> /physical/disk1
> /physical/disk2
> /physical/disk3
> Then have a logical filesystem:
> /pool which would have softlinks (have to be) from /physical/diskX...so,
> ln -s /physical/disk0 /pool/d0;
> ln -s /physical/disk1 /pool/d1;
> ln -s /physical/disk2 /pool/d2;
> ln -s /physical/disk3 /pool/d3;
> But I am stuck on how to glue together these 4 logical links into one.
>  Is there a "meta data" technique I am not aware of?
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