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Yeah, I agree with most of what has been said about NDMP. However I have a
few issues with NBU and NDMP, not sure if and when it will be addressed.
- You cannot have check point restarts for NDMP. Most of our NDMP backups
are huge, avg 4TB to 6TB volumes. So if a backup fails at the tail end, we
have to start all over again.
- Yes, we can split these large backups in to smaller (qtree level) chunks,
but then NBU doesn't support wildcards for NDMP backups. So it would be a
manual chore to keep the file list up-todate.
- Bad tapes gets used over and over again and jobs keep failing over and
over again. Normally when you have a bad media, NBU reports Status code 85,
so based on the vaule you set in
/usr/openv/netbackup/MEDIA_ERROR_THRESHOLD, NBU will freeze the tape. For
NDMP backups, its always status code 99, so NBU never freezes the tape,
resulting in the tape being used immediately and repeatedly for next NDMP
jobs and finallly the jobs fail after reaching the job retry threshold. We
had an issue one time when 8 jobs failed one after the other, all retrying
twice on the same tape!
Even with all these issues, NDMP is still very very fast for backups when
compared to doing backups over NFS or cifs. Luckly for us we only have to d=
o
40TB of NMDP backups once a month and rarely any need for restores.
-G
On 3/17/06, Paul Keating <pkeating AT bank-banque-canada DOT ca> wrote:
>
> Assuming NDMP vs network backups (not SAN media servers or some other
> "advanced" configuration), and assuming late model type drives (fFC
> connecting LTO1+ or similar) you should get significantly reduced backup
> times.
>
> file level restores will typically take much longer than if you'd done a
> network type backup/restore, so it is highly advisable to use the filer's
> built in snapshot ability for day to day file recovery.
>
> I can't really say I've seen any "common problems" with NDMP....there are
> no clients to install, so there's less admin work there.
> Once the server software is installedand a tape drive attached to the
> filer, and a STU created, it pretty much just works.
>
> Paul
>
> -----Original Message-----
> *From:* veritas-bu-admin AT mailman.eng.auburn DOT edu [mailto:
> veritas-bu-admin AT mailman.eng.auburn DOT edu] *On Behalf Of *Yoseph
> Leleputra
> *Sent:* March 16, 2006 9:17 PM
> *To:* veritas-bu AT mailman.eng.auburn DOT edu
> *Subject:* [Veritas-bu] Comparison with NDMP backup
>
> Dear Veritas Expert,
>
> I need some information from who that experiencing using NDMP feature for
> backup .
> If we compare with normally backup, how long time we can spend with NDMP
> backup.
> And what's the common problem will come if we using NDMP backup ??
> I really apreciated for every advice.
>
> Yoseph
>
>
>
> ------------------------------
> Brings words and photos together (easily) with
> PhotoMail
> <http://us.rd.yahoo.com/mail_us/taglines/PMall/*http://photomail.mail.yah=
oo.com>-
> it's free and works with Yahoo! Mail.
>
>
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Yeah, I agree with most of what has been said about NDMP. However I have a =
few issues with NBU and NDMP, not sure if and when it will be addressed.<br=
> - You cannot have check point restarts for NDMP. Most of our NDMP ba=
ckups are huge, avg 4TB to 6TB volumes. So if a backup fails at the tail en=
d, we have to start all over again.=20
<br>- Yes, we can split these large backups in to smaller (qtree level) chu=
nks, but then NBU doesn't support wildcards for NDMP backups. So it would b=
e a manual chore to keep the file list up-todate. <br>- Bad tapes gets used=
over and over again and jobs keep failing over and over again. Normally wh=
en you have a bad media, NBU reports Status code 85, so based on the =
vaule you set in /usr/openv/netbackup/MEDIA_ERROR_THRESHOLD, NBU will freez=
e the tape. For NDMP backups, its always status code 99, so NBU never freez=
es the tape, resulting in the tape being used immediately and repeatedly fo=
r next NDMP jobs and finallly the jobs fail after reaching the job retry th=
reshold. We had an issue one time when 8 jobs failed one after the other, a=
ll retrying twice on the same tape!=20
<br><br>Even with all these issues, NDMP is still very very fast for backup=
s when compared to doing backups over NFS or cifs. Luckly for us we only ha=
ve to do 40TB of NMDP backups once a month and rarely any need for restores=
.=20
<br>-G<br><br><div><span class=3D"gmail_quote">On 3/17/06, <b class=3D"gmai=
l_sendername">Paul Keating</b> <<a href=3D"mailto:pkeating@bank-banque-c=
anada.ca">pkeating AT bank-banque-canada DOT ca</a>>
wrote:</span><blockquote c=
lass=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, 204, 204); ma=
rgin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style=3D"direction: ltr;">
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2">Assuming NDMP =
vs network backups (not SAN media servers or some other=20
"advanced" configuration), and assuming late model type drives (f=
FC connecting=20
LTO1+ or similar) you should get significantly reduced backu=
p=20
times.</font></span></div>
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2"></font></span>=
</div>
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2">file=20
level restores will typically take much longer than if you'd done a ne=
twork=20
type backup/restore, so it is highly advisable to use the filer's built in=
=20
snapshot ability for day to day file recovery.</font></span></div>
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2"></font></span>=
</div>
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2">I=20
can't really say I've seen any "common problems" with NDMP....the=
re are no=20
clients to install, so there's less admin work there.</font></span></div>
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2">Once=20
the server software is installedand a tape drive attached to the filer, and=
a=20
STU created, it pretty much just works.</font></span></div></div><div style=
=3D"direction: ltr;"><span class=3D"sg">
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2"></font></span>=
</div>
<div><span><font color=3D"#800000" face=3D"Arial" size=3D"2">Paul</font></s=
pan></div></span></div><div style=3D"direction: ltr;"><span class=3D"e" id=
=3D"q_10a0850d3b15ecf3_2">
<blockquote style=3D"border-left: 2px solid rgb(128, 0, 0); padding-left: 5=
px; margin-left: 5px; margin-right: 0px;">
<div></div>
<div dir=3D"ltr" align=3D"left" lang=3D"en-us"><font face=3D"Tahoma" size=
=3D"2">-----Original Message-----<br><b>From:</b>=20
<a href=3D"mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu"
target=3D"_bla=
nk" onclick=3D"return top.js.OpenExtLink(window,event,this)">veritas-bu-adm=
in AT mailman.eng.auburn DOT edu</a>=20
[mailto:<a href=3D"mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu"
target=
=3D"_blank" onclick=3D"return top.js.OpenExtLink(window,event,this)">verita=
s-bu-admin AT mailman.eng.auburn DOT edu</a>] <b>On Behalf Of </b>Yoseph=20
Leleputra<br><b>Sent:</b> March 16, 2006 9:17 PM<br><b>To:</b>=20
<a href=3D"mailto:veritas-bu AT mailman.eng.auburn DOT edu" target=3D"_blank"
on=
click=3D"return top.js.OpenExtLink(window,event,this)">[email protected]=
ng.auburn.edu</a><br><b>Subject:</b> [Veritas-bu] Comparison=20
with NDMP backup<br><br></font></div>
<div>Dear Veritas Expert, </div>
<div> </div>
<div>I need some information from who that experiencing using NDMP featur=
e for=20
backup . </div>
<div>If we compare with normally backup, how long time we can spend=
with=20
NDMP backup. </div>
<div>And what's the common problem will come if we using NDMP b=
ackup=20
?? </div>
<div>I really apreciated for every advice.</div>
<div> </div>
<div>Yoseph </div>
<div> </div>
<div> </div>
<p>
</p><hr size=3D"1">
Brings words and photos together (easily) with<br><a href=3D"http://us.rd=
.yahoo.com/mail_us/taglines/PMall/*http://photomail.mail.yahoo.com"; target=
=3D"_blank" onclick=3D"return top.js.OpenExtLink(window,event,this)">PhotoM=
ail=20
</a>- it's free and works with Yahoo! Mail.<p></p></blockquote>
</span></div></blockquote></div><br>
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