[Talk] Reality check...
lukem at wasabisystems.com
Wed Sep 11 14:35:16 EST 2002
On Wed, Sep 11, 2002 at 01:40:25PM +1000, Steve Jenkin wrote:
| I had a thought & wanted a Reality Check on it.
| It seems too obvious not to have been thought of before, so what's the
| The cost of DLT & LTO tape media is ~$3/Gb.
| The cost of commodity IDE drives is ~$1-2/Gb. IDE enclosures with
| either Firewire or USB are cheap & readily available.
| Why aren't people moving away from tape media to removable IDE drives
| [and treat them just the same way as tapes. Normally kept on a shelf!]
| Fulfills 'Cheaper, faster, better'...
| What am I missing here?? Anyone heard of this being done?
A collegue of mine and I have discussed this exact issue.
The current thought is:
* Use our existing smaller tape (or cd-r or whatever) for
nightly backups of really important stuff (/home)
* Use external disks in firewire sleds (or other hot-pluggable
technologies; in 3-4 months serial ATA will become much more
prevalent and that supports hot plug), and back up the data
classified as "I need a backup of this on a semi regular
basis because it's a pain to get again" (pictures, software,
movies, etc). Use large capacity 5400rpm disks for this.
Take the hot plug sleds+drive and put them in a secure
A 100GB disk + infrastructure (external sled) is now cheaper than a
100GB tape + drive ($6K - $10K). I use `raw' figures in capacity
because gzip can compress better than a tape drive...
* now cheaper/MB
* random access
* smaller physical footprint (over drive + sled)
* slightly more resiliant, although you really don't want to
drop DLT tapes either.
This all said, I haven't deployed this myself. I'm still backing up
my primary personal data nightly onto a 12GB DDS-3, and my "media"
partition less regularly onto other disks and 20GB DDS-4. I do want
to move to this idea though.
Luke Mewburn <lukem at wasabisystems.com> http://www.wasabisystems.com
Luke Mewburn <lukem at netbsd.org> http://www.netbsd.org
Wasabi Systems - NetBSD hackers for hire
NetBSD - the world's most portable UNIX-like operating system
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