We clone our production data daily (tape to tape). We run 2 (week
days) and 3 (weekend) streams. We are cloning with fiber attached lto3
drives. We see consistent speeds of 75 to 80 MB/sec per stream (Thanks
Thierry for the I/O graphs in your reporting tool) and peaks of 100 to
120 MB/sec.
We don't clone from disk to tape, we stage production data to tape and
then clone. It just seems to work better this way for us.
Ken
On Thu, Sep 4, 2008 at 6:55 PM, Brian O'Neill <oneill AT oinc DOT net> wrote:
> Hey Curtis...
>
> I'm cloning from a fiber-connected Quantum DX3000 (14 "drives", max targets
> set to 1 on each) to a SCSI-connected LTO-3 (really a dual drive PX502
> library, but I only write to one drive at a time). I get at least 70MB/s
> according to Networker. Occasionally there are very short pauses - I'm not
> sure if this is due to not being able to pump the data fast enough (although
> I seem to hit 130MB/s easily enough) or just overhead in mounting the
> virtual tapes (I unmount and mark them read-only before the first clone
> operation).
>
>
> Curtis Preston wrote:
>>
>> Recently there was some discussion about VTLs and cloning. In that
>> discussion, a number of people seemed pretty happy with their cloning
>> performance/speed. This conflicted with what I usually hear, that
>> cloning was slow and inefficient - and that's NOT just on NetWorker.
>>
>>
>> What kinds of speeds are you getting with YOUR clones, and what are you
>> cloning from and to?
>>
>> I'd REALLY like to hear about anyone cloning to LTO-3, LTO-4, or devices
>> of similar speeds, especially if you're cloning from disk to tape.
>>
>>
>> ________________________________________________________
>> Curtis Preston | VP Data Protection
>> GlassHouse Technologies, Inc.
>>
>> T: +1 760 710 2004 | C: +1 760 419 5838 | F: +1 760 710 2009
>> cpreston AT glasshouse DOT com | www.glasshouse.com
>> <http://www.glasshouse.com/> Infrastructure :: Optimized
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> This email and any files transmitted with it are confidential and intended
>> solely for the use of the individual or entity to whom they are addressed.
>> If you have received this email in error please notify the system manager.
>> This message contains confidential information and is intended only for the
>> individual named. If you are not the named addressee you should not
>> disseminate, distribute or copy this e-mail.
>>
>> To sign off this list, send email to listserv AT listserv.temple DOT edu and
>> type
>> "signoff networker" in the body of the email. Please write to
>> networker-request AT listserv.temple DOT edu if you have any problems with
>> this
>> list. You can access the archives at
>> http://listserv.temple.edu/archives/networker.html or
>> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
>
> To sign off this list, send email to listserv AT listserv.temple DOT edu and
> type
> "signoff networker" in the body of the email. Please write to
> networker-request AT listserv.temple DOT edu if you have any problems with
> this
> list. You can access the archives at
> http://listserv.temple.edu/archives/networker.html or
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
>
--
They that can give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety.
--Benjamin Franklin
To sign off this list, send email to listserv AT listserv.temple DOT edu and
type "signoff networker" in the body of the email. Please write to
networker-request AT listserv.temple DOT edu if you have any problems with this
list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
|
