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IDS Forum

RE: ontape pipe restore times

Posted By: Paul Watson
Date: Friday, 17 August 2012, at 2:45 p.m.

In Response To: RE: ontape pipe restore times (Art S. Kagel)

Or compress the data

Cheers
Paul

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art S.
Kagel
Sent: Friday, August 17, 2012 1:42 PM
To: ids@iiug.org
Subject: RE: ontape pipe restore times [28069]

Your network is 100 megaBITS per second which at 8bits per byte works out to

12 megaBYTES per second. You are getting maximum throughput now. To get more

you will have to upgrade your network infrastructure an nic cards to GB or
better.

Art

Sent from my Galaxy SRIIIMARK JALKIEWICZ <mark.jalkiewicz@verizon.net>
wrote:11.50.FC8 AIX 5.3

I am looking to see if there is anyway an ontape pipe restore could be mande

to restore faster. (ontape -s -L 0 -t STDIO | rsh server ontape -p -t
STDIO).
During my testing the best thruput I can realize so far is around
12meg/second. The network is local , fast ethernet 100meg/second.

Instance is 300 gigs, out of which there are 200 gigs of used space . Out of

that metric is ~105 gigs of total used blobspace blob pages. So far the best

thruput obtained is around 3000 pages/second (12 mg/second ) which equates
to
around 4.5 hours to restore. I have tried allocating more transport buffers
(ARCHIVE_BUF_COUNT) from the default of 4 to 24 (and even higher) and
increased TAPEBLK to much higher values (16384) but that had no impact at
all.
It pretty much appears with pipe restores the transfer rate is limited by
the
OS and/or network somehow. FYI, using a tape dev I can restore the server <
2
hrs so that kind of pushes blame away from i/o.

Regards,

Mark

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