[dundee] ESATA Linux Support

Tue Mar 17 13:59:48 UTC 2009

this may do that job..

http://www.sentex.net/~mwandel/tech/changer.html

cheap dvd dual layer backup ;-)

hehehe

--- On Sun, 15/3/09, Simon Wells <swells at computing.dundee.ac.uk> wrote:
From: Simon Wells <swells at computing.dundee.ac.uk>
Subject: Re: [dundee] ESATA Linux Support
To: toxicnaan at yahoo.co.uk, "Tayside Linux User Group" <dundee at lists.lug.org.uk>
Cc: "Simon Wells" <swells at computing.dundee.ac.uk>
Date: Sunday, 15 March, 2009, 5:50 PM

Hi Lee,

I already have online replication of data both locally and remotely. I already
have a NAS running locally but wanted to have a decent offline backup solution.
With the questions about eSATA, I was looking for a way to consolidate all of
the various usb drives that I currently use for offline storage into a single
unit (so I can avoid the tangle of wires), using off the shelf hdd, and do it
reasonably cheaply using fairly standard Linux tools. It looks as though eSATA
fits the bill for me at this point.

It is debatable though as to whether RAID and other forms of online storage
constitutes a *backup* system. It goes some way towards enabling you to recover
from short term hardware failure but doesn't help when it comes to data
corruption where you need to restore from a known good backup.

Simon

Dr. Simon Wells
=============

E-mail: 	swells at computing.dundee.ac.uk
IM: 		sw3lls at yahoo.co.uk
Mail: 	School of Computing,
		Queen Mother Building,
		University of Dundee,
		Dundee, DD1 4HN.
WWW: 	http://quiddity.computing.dundee.ac.uk/swells/blog/
Phone: 	+44 (0)1382 386 526
Fax:		+44 (0)1382 385 509 (FAO: Simon Wells)

On 11 Mar 2009, at 00:00, Lee Hughes wrote:

> I've not used any esata, I *presume* it's looks like a normal sata
device, and should use normal sata drivers. I doubt esata uses a different
protocol or device driver than normal sata,.
> Why would it,  the the cable run's 'outside' of your machine.
..
> (and probably has about 17 different connectors(!) I think..... i may be
wrong!!  I'm sure
> any multiplexing that's going on, is done in hardware (i.e 1 cable, 4
disks)
> 
> If things are doom and gloomy on the esata , don't rule out using aoe
over gigabit ethernet, give you flexible storage over the network, and combine
that with some clever drdb -ing you can add as much fault tollerance as you
want.
> 
> http://mike.neir.org/weblog/619 is interesting.
> 
> You don't exactly say what your going to use the storage for, gigabit
ethernet cards and switches are cheap, and you can bond (if your using linux)
gigabit together, some people I've heard have got over 300mb/s of read/write
performance using this method, and striping aoe over different  disk and
systems. using drdb would add a layer of fault tollerance to the gig.
> If you go this route use PCIE gigabit adapters, not those made in pci
format, they are cheaper, but you'll only ever get around half the speed
that gigabit ethernet can go, as they just eat all the pci bus bandwidth....
> 
> 
> 
> 
> 
> 
> iscsi is interesting, but I just get more success with aoe at the moment
in terms of raw performance......
> 
> when you get it out of your head that storage is no longer attached to
system, but just
> out there on the network somewhere, you can start doing some very clever
things.
> 
> you don't need to bring a server down to add sata storage, just
configure it somewhere
> else and import it. Hotswap sata driver bays are nice, but expensive.
> 
> Replicate your storage array somewhere else, may to anothe building, now
your data
> is safe from falling asteriods.
> 
>  Using loopback devices, 'partitions' can be simple linux files
(all beit large), thus you can
> do clever thing with cow's .. mooooo.
> 
> 
> here some links....check em..
> 
> http://www.drbd.org/
> 
> http://www.linuxjournal.com/article/8149
> 
> http://en.wikipedia.org/wiki/ATA_over_Ethernet
> 
> http://www.mjmwired.net/kernel/Documentation/networking/bonding.txt
> 
> 
> A guide I wrote on using aoe vblade's with cow's.
> 
> http://www.etherboot.org/wiki/appnotes/cow
> 
> on the other hand, if you want to get a lot of storage, and want support
etc don't forget these people....
> 
> http://www.coraid.com/
> 
> http://www.coraid.com/PRODUCTS/SR2421
> 
> 24 Terrabytes anyone, almost enough space to store azmodie 'film'
collection ;-).
> 
> Cheers,
> Lee
> 
> --- On Mon, 9/3/09, Simon Wells <swells at computing.dundee.ac.uk>
wrote:
> From: Simon Wells <swells at computing.dundee.ac.uk>
> Subject: [dundee] ESATA Linux Support
> To: "Tayside Linux User Group" <dundee at lists.lug.org.uk>
> Cc: "Simon Wells" <swells at computing.dundee.ac.uk>
> Date: Monday, 9 March, 2009, 6:56 PM
> 
> Does anybody have any experience of using eSATA with Linux?
> 
> I have been looking
>  at something like the following:
>
http://www.amazon.co.uk/EdgeStore-DAS801T-Bay-eSATA-Enclosure/dp/B001H54JWW/ref=cm_cr_pr_sims_t
> 
> My plan would be to organise it as two separate JBOD arrays, using LVM,
and
> connected via eSATA. The two arrays will give me some measure of
redundancy and
> will make backing up my data much simpler. There is also a second remote
server
> that holds backups and very important data is also archived to DVD.
> 
> At the moment I am using a whole pile of separate external USB drives and
want
> to simplify the system by getting all of the drives into a single unit. Am
I
> missing anything? I have not used eSATA with Linux myself and would like
to know
> if there are any gotchas or things that I should be aware of.
> 
> Thanks,
> Simon
> 
> Dr. Simon Wells
> =============
> 
> E-mail: 	swells at computing.dundee.ac.uk
> IM: 		sw3lls at yahoo.co.uk
> Mail: 	School of Computing,
> 		Queen Mother Building,
> 
> 		University of Dundee,
> 		Dundee, DD1 4HN.
> WWW: 	http://quiddity.computing.dundee.ac.uk/swells/blog/
> Phone: 	+44 (0)1382 386 526
> Fax:		+44 (0)1382 385 509 (FAO: Simon Wells)
> 
> 
> 
> 
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