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

[Luis Murillo]

Yes, you would need some fiber setup with multiple drives and also
keep in mind that the place where you keep your data that you want to
backup must also provide the data as fast as possible...for example
over the network on a 100MBit network don't expect to reach 163MBps
speed on one drive...

-LM

On 3/4/08, Chris Knadle <Chris.Knadle at coredump.us> 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
>
>
>    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.
>
>
>  > 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.
>
>
>    -- Chris
>
>  --
>
>  Chris Knadle
>  Chris.Knadle at coredump.us
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-- 
LuisM