[nylug-talk] Recommendations for encrypted tape drive(s)?

[Brandorr]

veritas-bu at mailman.eng.auburn.edu is a good list for this kind of
question, even if you aren't using NBU.

-Brian

On Tue, Mar 4, 2008 at 10:14 PM, Peter C. Norton <spacey-nylug at lenin.net> wrote:
> On Tue, Mar 04, 2008 at 07:25:14PM -0500, Chris Knadle wrote:
>  > On Tuesday 04 March 2008, Luis Murillo wrote:
>  > > Ok, I agree some of the data you provide is not something I can go up
>  > > against at...but one thing I can say that you missed is the LTO4
>  > > speed...the LTO4 can reach speeds of up to 240MBps on an ideal system
>  > > but since that's not always correct, I've seen the drives work around
>  > > 160MBps and would consider a drive that is doing less that 150MBps to
>  > > be having performance issues...at least on SCSI :)
>  >
>  >    Just out of curiosity I wanted to know how long it would take to back up
>  > the 30 TB number that Peter mentioned (with a single device):
>  >
>  >     Rate        Time
>  > ---------------------------
>  >    240 MB/s   36.4 hours
>  >    160 MB/s   54.6 hours
>  >    120 MB/s   72.8 hours
>
>  Yeah, so 240, or 160 is the "tolerable" timeframe for weekend fully
>  backups, or montly weekend full backups, with incrimentals taken
>  periodically. Considering the sun thumper (aka x4500
>  http://www.sun.com/servers/x64/x4500/) can hold 46 ide data disks once
>  you've mirrored the root disks, the 30TB  starting point is only about
>  70% of the capacity of a single system in a rack at an "affordable"
>  price (that is, a fair fraction of most other solutions that put this
>  much storage into a single enclosed device).
>
>
>  >
>  >    So if an LTO4 is the fastest drive available and a company wants to do a
>  > full backup every 24 hours (most probably don't but some do), then it seems
>  > like a lot more than a single tape device is required.
>
>  Does anyone do full backups on "large" systems daily to tape? I've
>  never seen it managed any other way except perhaps a copy to
>  annother disk system (eg. databases dumps to disk) followed by full
>  dumps and incrimentals afterwards).
>
>
>  > > The scenario I wrote about it's completely true...I've seen it happen
>  > > on the drives that I support.
>  >
>  >    Yeah, at those kinds of data rates I'd believe that.  That's probably an
>  > interesting profile to consider concerning kernel scheduling.
>
>  Yep. All of it is super cool now.
>
>
>  -Peter
>
>  --
>  The 5 year plan:
>  In five years we'll make up another plan.
>  Or just re-use this one.
>
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-- 
- Brian Gupta

http://opensolaris.org/os/project/nycosug/

http://www.genunix.org/wiki/index.php/OpenSolaris_New_User_FAQ