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One comment regarding backing up/archiving images: we have back up
copies stored on a RAID array for as long as there is space. Then
it's first in-first out. We archive on DVD. In both cases, we are
routinely compressing all the images. We can get 50%, and often more,
compression out of the image formats we use most often. If space is
limited, and there is time to occasionally do the compression/
decompression, that's a great way of getting more bang for your buck.
Best - MM
On Apr 19, 2006, at 12:25 PM, Hurley, Thomas D. wrote:
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We use a two-pronged strategy. For temporary archiving of data (up
to 6
months we, like many, like the user-friendliness of the USB drives
(200
GB is our current incarnation) and their speed of access for issues
related to alternative processing strategies. For archival
storage, we
use the current incarnation of DVD (8.5 GB double-layer) disks. The
capacity of these disks is equivalent to ~1 360 degree data set, plus
processing files, from most beamlines.
The one common feature of backup media is that they always change
[reel
tapes, TK50's, gigastore VCR tapes, 4 mm DAT's, 8 mm tapes, DLT's, are
all media I have had the pleasure of enduring]. I still have
nightmares
about those VCR tapes, in our hands they were an effective means of
permanently storing data with no hope of retrieval.
Tom Hurley
Indiana University
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of
James Holton
Sent: Wednesday, April 19, 2006 12:15 PM
To: Sergei Strelkov
Cc: [email protected]
Subject: Re: [ccp4bb]: How do you store your datasets?
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I use DVDs.
- They still have ~5x lower price/GB than hard drives.
- The media are stable (advertizing 100 years expected MTBF, as
opposed
to 3-5 years for hard drives and tapes)
- DVD-R cannot be overwritten, so it is appropriate for archiving
scientific data
- DVDs are "portable" in that a lot of people have drives that can
read
them. Since I am running a national user facility, we need to play to
the "lowest common demoninator" of what kind of read-back drives users
might have at home. Blu-Ray sounds neat and all, but I don't own a
Blu-Ray drive. Do you? I think it will be more like 5-10 years
before
DVD-ROM drives become as hard to find as CD-ROM drives are today.
-James
Sergei Strelkov wrote:
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Dear All,
as a followup to my earlier posting, I would like to
ask opinions on the optimal ways to save and keep
the collected data.
Tape is slow and cumbersome. Other options would be
(1) dedictated hard disks / RAID, and
(2) DVDs (which will probably be replaced by
BluRays or like within the next year or two).
Best wishes,
Sergei.
------------------------------------------------------------------------
--------
Mischa Machius, PhD
Associate Professor
UT Southwestern Medical Center at Dallas
5323 Harry Hines Blvd.; ND10.214A
Dallas, TX 75390-8816; U.S.A.
Tel: +1 214 645 6381
Fax: +1 214 645 6353
