[Sunhelp] Re: Backup help!

Wed Sep 13 04:23:41 CDT 2000

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Is rsync a standard solaris command?
Can you give me an example rsync command such as:
/usr/sbin/rsync -x /dev/dsk/c0t1d0s0 /dev/dsk/c0t2d0s0
A man page snip would be great.
Can you use the file system while it is being rsynced?

Thanks,
1st

> -----Original Message-----
> From:	Steffen Grunewald [SMTP:steffen at gfz-potsdam.de]
> Sent:	Wednesday, September 13, 2000 3:03 AM
> To:	sunhelp at sunhelp.org
> Subject:	[Sunhelp] Re: Backup help!
> 
> On Tue 2000-09-12 (13:49), Adams, Christopher wrote:
> > Anyone know of any good "free" back-up software for Solaris 7?  I'm
> > currently faced with backing up a critical directory:
> > 
> > This partition contains "very"critical data for my company.  Working on
> > limited resources I have been using "ufsdump" to backup the entire
> partition
> > each time to an individual file and then copying the file across the
> network
> > (slow) to a tape backup on another Solaris box. 
> 
> What about mirroring the whole volume to another disk/partition
> (using rsync e.g., but Veritas has tools, too)? You could backup
> that partition afterwards.
> rsync is very fast in synchronizing large file systems which get
> moderately modified.
> 
> And most backup software can access remote tape drives. If not,
> you could still ufsdump to stdout and pipe that to a rsh, I guess.
> (BTW, can some kind soul tell me something about the record structure
> of an ufsdump tape?)
> 
>   In order to get a very
> > accurate backup I have to umount the /ServerData partition and then do
> the
> > ufsdump of this partition to a file.  My reason for using ufsdump was
> > because we have about 6 gigs of files in /ServerData and my company
> wishes
> > to have all of this backed up or at least to have the partition
> re-mounted
> > and back online in under 1 hour.  The ufsdump seemed to be fast enough
> to do
> > this.  Tar was too slow it seemed and a standard "cp" command to the
> tape
> > device was a nightmare time wise.
> 
> In most cases, rsync would need only minutes since only differences are
> transmitted, and if you're doing it locally it will be really fast.
> After that, you could continue working with your hot volume and backup
> the mirror. Depending on the tape drive being used you'd expect about
> 500KB/s (DDS-3) - that's 30MB/min or about 3 hours per 6GB, even less
> if data is compressible. In this case, network bandwidth usually won't 
> limit throughput. DLT will be faster, of course...
> 
> > My company no longer wants me to umount the partition to do the ufsdump
> > (making my dump very inaccurate).  They would rather not pay money for
> > expensive backup software either, so this leaves me a bit in a bind.
> 
> Well, they will give you the $100 for a medium-sized disk, won't they?
> 
> > Thanks again Solaris Gods!
> 
> No god, still learning too, regards, Steffen
> 
> -- 
> Steffen Grunewald ** GeoForschungsZentrum  Potsdam ** Projektbereich 2.2
> Telegrafenberg E3 ** D-14473  Potsdam ** Germany / Duitsland / Allemagne
> office: steffen(at)gfz-potsdam.de  **  home: steffen.grunewald(at)gmx.de
>    My opinions are mine. But you can rent them. Ask me for discounts.
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/sunhelp

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<P><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Is rsync a standard =
solaris command?</FONT>
<BR><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Can you give me an =
example rsync command such as:</FONT>
<BR><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">/usr/sbin/rsync -x =
/dev/dsk/c0t1d0s0 /dev/dsk/c0t2d0s0</FONT>
<BR><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">A man page snip =
would be great.</FONT>
<BR><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Can you use the =
file system while it is being rsynced?</FONT>
</P>

<P><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Thanks,</FONT>
<BR><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">1st</FONT>
</P>
<UL>
<P><FONT SIZE=3D1 FACE=3D"Arial">-----Original Message-----</FONT>
<BR><B><FONT SIZE=3D1 FACE=3D"Arial">From:  </FONT></B> <FONT =
SIZE=3D1 FACE=3D"Arial">Steffen Grunewald =
[SMTP:steffen at gfz-potsdam.de]</FONT>
<BR><B><FONT SIZE=3D1 FACE=3D"Arial">Sent:  </FONT></B> <FONT =
SIZE=3D1 FACE=3D"Arial">Wednesday, September 13, 2000 3:03 AM</FONT>
<BR><B><FONT SIZE=3D1 =
FACE=3D"Arial">To:    </FONT></B> <FONT SIZE=3D1 =
FACE=3D"Arial">sunhelp at sunhelp.org</FONT>
<BR><B><FONT SIZE=3D1 =
FACE=3D"Arial">Subject:       </FONT>=
</B> <FONT SIZE=3D1 FACE=3D"Arial">[Sunhelp] Re: Backup help!</FONT>
</P>

On Tue 2000-09-12 (13:49), Adams, =
Christopher wrote:
 > Anyone know of any good =
"free" back-up software for Solaris 7?  I'm
 > currently faced with backing up =
a critical directory:
 > 
 > This partition contains =
"very"critical data for my company.  Working on
 > limited resources I have been =
using "ufsdump" to backup the entire partition
 > each time to an individual file =
and then copying the file across the network
 > (slow) to a tape backup on =
another Solaris box.

What about mirroring the whole volume =
to another disk/partition
 (using rsync e.g., but Veritas has =
tools, too)? You could backup
 that partition afterwards.
 rsync is very fast in synchronizing =
large file systems which get
 moderately modified.

And most backup software can access =
remote tape drives. If not,
 you could still ufsdump to stdout and =
pipe that to a rsh, I guess.
 (BTW, can some kind soul tell me =
something about the record structure
 of an ufsdump tape?)

<P><FONT SIZE=3D2 FACE=3D"Arial">  In order to get a very</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> accurate backup I have to umount =
the /ServerData partition and then do the</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> ufsdump of this partition to a =
file.  My reason for using ufsdump was</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> because we have about 6 gigs of =
files in /ServerData and my company wishes</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> to have all of this backed up or =
at least to have the partition re-mounted</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> and back online in under 1 =
hour.  The ufsdump seemed to be fast enough to do</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> this.  Tar was too slow it =
seemed and a standard "cp" command to the tape</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> device was a nightmare time =
wise.</FONT>
</P>

In most cases, rsync would need only =
minutes since only differences are
 transmitted, and if you're doing it =
locally it will be really fast.
 After that, you could continue =
working with your hot volume and backup
 the mirror. Depending on the tape =
drive being used you'd expect about
 500KB/s (DDS-3) - that's 30MB/min or =
about 3 hours per 6GB, even less
 if data is compressible. In this =
case, network bandwidth usually won't 
 limit throughput. DLT will be faster, =
of course...

<P><FONT SIZE=3D2 FACE=3D"Arial">> My company no longer wants me to =
umount the partition to do the ufsdump</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> (making my dump very =
inaccurate).  They would rather not pay money for</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">> expensive backup software =
either, so this leaves me a bit in a bind.</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Well, they will give you the $100 for =
a medium-sized disk, won't they?</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">> Thanks again Solaris Gods!</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">No god, still learning too, regards, =
Steffen</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">-- </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Steffen Grunewald ** =
GeoForschungsZentrum  Potsdam ** Projektbereich 2.2</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Telegrafenberg E3 ** D-14473  =
Potsdam ** Germany / Duitsland / Allemagne</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">office: =
steffen(at)gfz-potsdam.de  **  home: =
steffen.grunewald(at)gmx.de</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">   My opinions are mine. =
But you can rent them. Ask me for discounts.</FONT>
<BR><FONT SIZE=3D2 =
FACE=3D"Arial">_______________________________________________</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">SunHELP maillist  -  =
SunHELP at sunhelp.org</FONT>
<BR><U><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial"><A =
HREF=3D"http://www.sunhelp.org/mailman/listinfo/sunhelp" =
TARGET=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhelp</A></F=
ONT></U>
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