Archived posting to the Leica Users Group, 2010/03/25

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Subject: [Leica] Tape back up for photographers
From: spencer at aotera.org (Spencer Cheng)
Date: Thu, 25 Mar 2010 09:01:30 -0400
References: <738445.1885.qm@web111708.mail.gq1.yahoo.com> <20100317201614.GB417@selenium.125px.com> <20100318144905.GC22732@mars-attacks.org> <25D10E3B-53AC-4092-9406-F91C2C2C8D8D@aotera.org> <20100318192008.GD417@selenium.125px.com> <60940A68-4EE4-45DD-89FC-996496721208@aotera.org> <4BA809CA.90304@csdco.com><0CBC8CD2-DBFE-458A-B340-15A4AE06FEB3@aotera.org> <4BA82A63.3050701@csdco.com><4BA8867D.5030304@hale-pohaku.com> <4BA95AD2.2090602@csdco.com><4BA9FF66.5090602@hale-pohaku.com> <4BAA433F.5050201@csdco.com> <C9237B13-EEB3-432E-9662-9716E5108973@aotera.org> <4BAB35A3.1060700@hale-pohaku.com>

Good point Dennis. This should be moved to the other mailing list.

Regards,
Spencer

On Mar 25, 2010, at 6:06, Dennis wrote:

> Hi Spencer,
> 
> I think we may want to put this over to the Imagestore list, but.
> 
> At some point, say over 10TB, and growing, I think you are reaching a 
> point of diminishing returns using disc drives for backup and/or 
> archiving. Managing a lot of disc drives manually becomes a tedious and 
> error prone task. This is where automation can be your friend. John's tape 
> library is more than I would expect a photographer to need but I would 
> want a library that accepts at least two drives in order to migrate data 
> to the next generation media. Typically these libraries are attached to 
> servers. I am not sure but expect that you can run them on a unix or 
> windows system, not sure about Mac.
> 
> It's likely that you will need a server to keep up with the performance of 
> the drive. LTO 4 can write data at speed of up to 120 MB/s.I  don't think 
> windows desktop can serve up that data rate. The drive can stream at lower 
> data rates but obviously the backup will take longer.
> 
> The LTO format is very reliable. They are not designed to be consumer 
> products, the typical customer is going to be a large corporation that 
> expects and gets a reliable product. The media life that John quoted 
> sounds like the spec to me. Once you write data to the tape you should 
> never have to check it. If you want I can discuss the read after write 
> that occurs in real time when data is written, the error correction that 
> is part of the LTO specification, and, importantly the servo tracking that 
> is important to ensuring data written can be read back on another drive. 
> Keep in mind that the major drive manufactures are HP, IBM, and Quantum 
> (Quantum acquired its seat as one of the technology providers of the LTO 
> Consortium when Quantum bought Certance, a spin off from Seagate)
> 
> Backup software is going to be selected from the library vendors list of 
> qualified vendors.
> 



In reply to: Message from profmason at yahoo.com (John Edwin Mason) ([Leica] Digital academia)
Message from tgray at 125px.com (Tim Gray) ([Leica] Digital academia)
Message from boklm at mars-attacks.org (nicolas vigier) ([Leica] Digital academia)
Message from spencer at aotera.org (Spencer Cheng) ([Leica] Digital academia)
Message from tgray at 125px.com (Tim Gray) ([Leica] Digital academia)
Message from spencer at aotera.org (Spencer Cheng) ([Leica] Digital academia)
Message from john.nebel at csdco.com (John Nebel) ([Leica] Digital academia)
Message from spencer at aotera.org (Spencer Cheng) ([Leica] Digital academia)
Message from john.nebel at csdco.com (John Nebel) ([Leica] Digital academia)
Message from dennis at hale-pohaku.com (Dennis) ([Leica] Digital academia)
Message from john.nebel at csdco.com (John Nebel) ([Leica] Digital academia)
Message from dennis at hale-pohaku.com (Dennis) ([Leica] Digital academia)
Message from john.nebel at csdco.com (John Nebel) ([Leica] Digital academia)
Message from spencer at aotera.org (Spencer Cheng) ([Leica] Tape back up for photographers)
Message from dennis at hale-pohaku.com (Dennis) ([Leica] Tape back up for photographers)