if you are doing (automatic) savegroup cloning, that's all you get
in fact, cloning can't duplex, it actually un-muxes. only one stream is
ever sent to a clone tape at a time
but every nsrclone process gets one stream, so to multiplex, you use
more than one tape
due to this obvious defeciency, we stopped using automatic cloning,
instead scripting something to determine the savesets to clone and
splitting them N ways and running nsrclone on each group
something like this:
mminfo -a -q "pool=VTL" -q "copies=1" -r
"ssid,ssflags,client,sscreate,ssbrowse,ssretent,totalsize(14),level,name
" | sort -ub +2 +0 | grep -v " vr" | grep -v " ssid " | awk -f
~/bin/sizeclone.awk
# split by hand into files at /var/tmp/clone/setN
cd /var/tmp/clone
foreach SET (set?)
batch <<!
echo working /var/tmp/clone/$SET
nsrclone -v -b "Period Clone" -S -f /var/tmp/clone/$SET |& tee
/var/tmp/log.$SET
!
end
where sizeclone.awk splits them into ~2TB chunks:
# cat bin/sizeclone.awk
BEGIN { { a = 1 }
{ tot = 0 }
{ sets = 0 }
{ totsets = 1 } }
{ if ( a == 1 ) {
print "cloneset ", a++ ," starts after ", $1 , $3 , $9 } }
{ s = s + $7 }
{ print $1 }
{ sets ++ }
{ if ( s >= 2048779069440 ) {
print " ( ", sets ," savesets, data size ", s/1099511627776
, "TB )"
print "cloneset ", a++ ," starts after ", $1 , $3 , $9
tot = tot + s
totsets = sets + totsets
sets=0
s=$7 } }
END {
print " ( ", sets ," savesets, data size ", s/1099511627776
, "TB )"
tot = tot + s
totsets = sets + totsets - 1
print "\nTotals: savesets", totsets, ", clonesets", a-1, ", data
size", tot/1099511627776 , "TB" }
HTH
Jerry
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Tim Verbois
Sent: Wednesday, January 23, 2008 2:44 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Cloning parallelism
Hello,
Environment:
VTL
L700 (LTO3 + LTO2 drives)
Legato 7.3.2 from SUN
Server + storage node
is it possible to have the parallelism on a cloning set to 2? I changed
the setting in the java interface, but it doesn't change a thing.
Why do I want to do that? We clone from VTL to L700 LTO3 tape drives.
The speed of an LTO3 drive is 70 MB/s native and can reach 100 MB when
compressed. Our VTL can supply data at a speed of 70 MB/s. A client
can do a restore at max 50 MB/s. So while we clone at a speed of 70
MB/s compressable data, we lose at least 20 MB/s average speed for
cloning. For restores, our tape is to fast, we would be satisfied with
an everage restore speed of 40MB/s.
The problem we have is that we need the top speed for cloning because of
the small time window for cloning (backupping every day and the full
weekend, needs cloning at top speeds during all the free time).
In a few weeks we start using LTO4, this is going to make the loss of
speed even bigger, much bigger. Can this be solved?
--
Tim Verbois
Unix Team
EDS-Telindus
02/553.71.73
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