A very nice treatment of the pros and cons of the backblaze pod
is given by the Bioteam at
http://bioteam.net/tag/backblaze/
While the pods are not for every use, it is important not to make the
usual mistakes of newsgroup postings:
1) If A is better than B, then B is no good.
2) If it doesn't solve my problem, then no one else
should use it either.
The Bioteam's series of postings would be very helpful to anyone
building a pod if it should turn out to be what they do need.
dan feenberg
On Fri, 22 Feb 2013, Bill Bogstad wrote:
On Fri, Feb 22, 2013 at 1:08 PM, Dan Ritter <[email protected]> wrote:
On Fri, Feb 22, 2013 at 01:05:55PM -0500, Bill Bogstad wrote:
That's close to 50 million 4GByte video files. Here's their blog
entry about it:
http://blog.backblaze.com/2013/02/20/180tb-of-good-vibrations-storage-pod-3-0/
Note that backblaze does all their redundancy on a cross-pod
basis, not inside a pod. Their model is that any pod can fail
without disturbing the overall system. As a result, they don't
do hotswap or RAID, and they don't care much about performance.
It does look like BackBlaze's hardware probably doesn't do hotswap.
However, even if they don't use it, he could always do software RAID.
In fact, it sounds like they use software RAID6 with LVM. Or at
least they did the in the second iteration of their storage pods:
http://blog.backblaze.com/2011/07/20/petabytes-on-a-budget-v2-0revealing-more-secrets/
As for performance, I seem to recall that last night Peter said that
once a file is "in place"; it doesn't move around very much. So
performance doesn't sound like the primary issue.
Bill Bogstad
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