Hi,

Not sure but...

You may not have the 8MB DLT7000. An early revision only had 4MB I believe which didn't provide the throughput expected so the device was rev'd by Quantum and given 8MB. Check with your tape vendor.

-----Original Message----- From: mgx@spruce.lsd.ornl.gov [mailto:mgx@spruce.lsd.ornl.gov] Sent: Thursday, March 25, 1999 2:18 PM To: Jason D. Kelleher Cc: mgx@spruce.lsd.ornl.gov; Will Harper; NetApp Toasters E-mail" Subject: Re: NDMP backup speeds

i'd love to see 35-45GB/hour. the netapps are on a 100MB full-duplex lan. we're using budtool 4.5/ndmp and the tapedevice is nrst0a (70GB/compressed). this is what the netapp thinks about the tape drive/scsi adapter:

slot 2: SCSI Host Adapter 2 (QLogic ISP 1040B) Firmware Version 2.26 Clock Rate 60MHz.

4: QUANTUM DLT7000 1E48 <------------------------

In-Band Enclosure Services 0 Swap Events, 0 Enclosure Events

where is my problem i wonder?

-- michael

On Thu, Mar 25, Jason D. Kelleher wrote:

In message 19990325105303.A7088@avatar.lsd.ornl.gov, mgx@spruce.lsd.ornl.g ov writes:

...

fwiw, i'm backing up my two F520's via ndmp to a DLT7000 and i'm averaging about 11.7GB/hour.

-- michael

That sounds slow.  We're readying an F740 for production and our
tests show ~3MB/s (~11GB/hr) over a 110mb full-duplex connection to
a Sun "backup server" with a DLT4000 jukebox.  That's theoretical
max on a DLT4000 and still plenty of room on the network.  Haven't
tried multiple concurrent dumps yet, so I'm not sure how well that
would scale.  You should see about triple the throughput to a
single DLT7000.

jason