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I'm seeming 30-40 for sure....but I'm not concerned with throughput....
=20
I want to know the number of drives considered minimum to provide
resiliency, in the case of failed drives.
=20
Ok, sample environment.
several 100mb/s win clients retention 2 weeks mpx=3D8
several GigE win clients, retention 2 weeks.mpx=3D2
exchange server GigE, retention 2 weeks, mpx-2, different volume pool
than above.
several 100mb/s unix clients retention 7 weeks mpx=3D2
several unix DB servers with SHORT backup windows, retention 7 weeks
mpx=3D2
=20
So 3 LTO drives are sufficient to backup your entire environment in a
timely manner.
One Windows client with GigE with a 2 week retention starts at 7pm, and
due to a problem with VSP snapshot, the job hangs and is still running
at 8am.
That's one drive gone....remainder of 100mb/s clients with 2 week
retention can hit that drive, one at a time, and gigE clients can
continue to backup, one at a time, since a mp2 job is hung on that
drive....limiting number of jobs on that drive to 2.
a tape messes up in a drive, and a drive goes down.....that's two drives
gone.
=20
one drive left to backup your environment....a job with 2 week retention
is writing to that drive, and additional jobs will multiplex to it
untill all 2 week retention jobs are done.
=20
exchange and all the 7 week retention jobs are queued waiting for all
Windows 2 week jobs to finish.........by the time the 2 week jobs are
done, it's 5am, and the backup window is closed......
=20
result 100+ status 196 jobs.
=20
Question: is three tape drives sufficient in this or any environment???
-----Original Message-----
From: Piszcz, Justin [mailto:jpiszcz AT servervault DOT com]=20
Sent: June 29, 2005 8:43 AM
To: Paul Keating; Veritas List
Subject: RE: [Veritas-bu] minimum number of tape drives
=09
=09
Using 8-stream multiplexing I see around 35-55MB/s per drive on
a single LTO2 drive.
=20
=09
_____ =20
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Paul
Keating
Sent: Wednesday, June 29, 2005 7:54 AM
To: Veritas List
Subject: [Veritas-bu] minimum number of tape drives
=20
Just as a quick survey,.....based on number of clients,
regardless of drive type, speed, etc,
=20
What would any of you consider a MINIMUM number of tape drives
for an environment with ~100 network based clients and 2 TB of data??
200 clients and 4 TB? 400 clients and 8 TB?
=20
I'm not looking for minimum number of drive to backup x
terabytes of data, in y hours, as that is more just math, and how fast a
drive will stream data, assuming your clients can push it fast enough.
=20
I'm looking more for what you would feel comfortable with,
knowing that a job(s) can hang due to Windows Open File Backup tanking,
or a tape getting stuck in a drive, or a large job failing at the last
minute and having to be restarted, or a SCSI error downing a drive, etc,
etc.
=20
Paul
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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>I'm=20
seeming 30-40 for sure....but I'm not concerned with=20
throughput....</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>I want=20
to know the number of drives considered minimum to provide resiliency, =
in the=20
case of failed drives.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>Ok,=20
sample environment.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>several 100mb/s win clients retention 2 weeks =
mpx=3D8</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>several GigE win clients, retention 2 =
weeks.mpx=3D2</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>exchange server GigE, retention 2 weeks, mpx-2, different =
volume pool=20
than above.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>several 100mb/s unix clients retention 7 weeks =
mpx=3D2</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>several unix DB servers with SHORT backup windows, retention 7 =
weeks=20
mpx=3D2</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005></SPAN><SPAN =
class=3D421515612-29062005><FONT=20
face=3DArial color=3D#800000 size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>So 3 LTO drives are sufficient to backup your entire =
environment in=20
a timely manner.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>One=20
Windows client with GigE with a 2 week retention starts at 7pm, and =
due to=20
a problem with VSP snapshot, the job hangs and is still running at=20
8am.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>That's=20
one drive gone....remainder of 100mb/s clients with 2 week =
retention can=20
hit that drive, one at a time, and gigE clients can continue to backup, =
one at a=20
time, since a mp2 job is hung on that drive....limiting number of jobs =
on that=20
drive to 2.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>a tape=20
messes up in a drive, and a drive goes down.....that's two drives=20
gone.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>one=20
drive left to backup your environment....a job with 2 week retention is =
writing=20
to that drive, and additional jobs will multiplex to it untill all 2 =
week=20
retention jobs are done.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>exchange and all the 7 week retention jobs are queued waiting =
for all=20
Windows 2 week jobs to finish.........by the time the 2 week jobs are =
done, it's=20
5am, and the backup window is closed......</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>result=20
100+ status 196 jobs.</FONT></SPAN></DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D421515612-29062005><FONT face=3DArial color=3D#800000 =
size=3D2>Question: is three tape drives sufficient in this or any=20
environment???</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #800000 2px =
solid; MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B> =
Piszcz, Justin=20
[mailto:jpiszcz AT servervault DOT com] <BR><B>Sent:</B> June 29, 2005 8:43=20
AM<BR><B>To:</B> Paul Keating; Veritas List<BR><B>Subject:</B> RE:=20
[Veritas-bu] minimum number of tape drives<BR><BR></FONT></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Using =
8-stream=20
multiplexing I see around 35-55MB/s per drive on a single LTO2=20
drive.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<DIV class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><FONT=20
face=3D"Times New Roman" size=3D3><SPAN style=3D"FONT-SIZE: 12pt">
<HR tabIndex=3D-1 align=3Dcenter width=3D"100%" SIZE=3D2>
</SPAN></FONT></DIV>
<P class=3DMsoNormal><B><FONT face=3DTahoma size=3D2><SPAN=20
style=3D"FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">From:</SPAN></FONT></B><FONT=20
face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">=20
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B><SPAN=20
style=3D"FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Paul =
Keating<BR><B><SPAN=20
style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, June 29, 2005 =
7:54=20
AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B> Veritas=20
List<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> =
[Veritas-bu]=20
minimum number of tape drives</SPAN></FONT><o:p></o:p></P></DIV>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Just as a quick =
survey,.....based=20
on number of clients, regardless of drive type, speed,=20
etc,</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">What would any of you =
consider a=20
MINIMUM number of tape drives for an environment with ~100 network =
based=20
clients and 2 TB of data?? 200 clients and 4 TB? 400 clients and =
8=20
TB?</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I'm not looking for =
minimum number=20
of drive to backup x terabytes of data, in y hours, as that is more =
just math,=20
and how fast a drive will stream data, assuming your clients can push =
it fast=20
enough.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I'm looking more for =
what you=20
would feel comfortable with, knowing that a job(s) can hang due to =
Windows=20
Open File Backup tanking, or a tape getting stuck in a drive, or a =
large job=20
failing at the last minute and having to be restarted, or a SCSI error =
downing=20
a drive, etc, etc.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Paul</SPAN></FONT><o:p></o:p></P></DIV></DIV></BLOCKQUOTE></BODY><=
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=00
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