Veritas-bu

[Veritas-bu] Disk Based Backup

2004-06-12 05:29:47
Subject: [Veritas-bu] Disk Based Backup
From: hampus.lind AT rps.police DOT se (Hampus Lind)
Date: Sat, 12 Jun 2004 11:29:47 +0200
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MessageHi again!

I forgot to ask about veritas licensing... We are considering to but a =
DL300, but our veritas sales rep. say that veritas hasent licensed this =
product yet, hopefuly they will do this during june, he say.
However he also said that we probably we have to buy 1 tape drive =
license for every virtual drive we create. This is kind a bad i think =
because you lose some of the flexibility with the DL. Also it can be =
quite expencive if we create many drives. I still consider the DL to be =
something we need, and it is much sheaper than real drives.
Also, how will veritas control how many drives one have? Maybe the =
license the entire DL cabinett and it will cost us much money.

Who have you licensed your DL? Who do you think veritas will do this =
licensing?

Best Regards
Hampus Lind

  ----- Original Message -----=20
  From: McDonald_Brian AT emc DOT com=20
  To: Ebon_Nash AT compuware DOT com ; joe AT joe DOT net ; paul.esson AT 
redstor DOT com ; =
veritas-bu AT mailman.eng.auburn DOT edu=20
  Sent: Wednesday, June 09, 2004 9:34 PM
  Subject: RE: [Veritas-bu] Disk Based Backup


   The newer disk libraries based on SATA are very fast. The only tape =
devices  I have  tested that even came close to them in performance =
using Netbackup
  is the IBM FC LTO Gen 2. Then, with multistreams or with a =
multistream/mulitplexed backup the difference again widens edge: the =
disk library solution.

     I compared the EMC DL  against various TLUs with SCSI DLT 7000, =
SDLT 220N, SDLT320, LTO gen 1, LTO gen 2 and FC LTO gen 1 and gen 2.=20
  Pushed to its maximum aggregate performance the DL will do 450 MB/s. =
If there is any single tape library that can do that, I would have to =
see it.
  Thats not specmanship, its actual measured performance.=20
    The new DLs in many cases save you money too by
   - eliminating the SSO Option in some cases and still be able to share =
this device with multiple hosts
  - Can also replicate the virtual tapes to physical tapes if you're =
obligated to do that. The end result is you need half the physical tapes =
you used to
  need.
  - If you are trucking off line copies to a secured site, you can =
eliminate the truck middleman by putting the physical tape device there =
and configuring it the=20
  DL over a DWDM link. Simply by telling NBU to eject (in this case =
virtual) tape from the virtual library will automatically start the copy =
to physical tape at=20
  the secured  site. . I did this over a 200km DWDM link to a STK L180 =
with FC 994B tape drives. Its tough to get double digit IO performance
  of anything over a single DWDM link and I was doing 17 MB/s with one =
stream.=20

   But the real beauty of the DL is the benefit of RAID. That increases =
the reliability of the on site backup set. When a tape drive fails, you =
lose a storage device
  and some aggregate performance of the TLU until the drive is replaced. =
If a disk in the DL fails, no loss of performance or storage unit.
    A tape device can run into a "bad tape experience" now and then =
doing a backup. You won't have that with a DL. Of course you could have =
that with
  the physical TLU device the DL might optionally have as the archiving =
device, but thats not going to interfere with your backup window. The DL =
to physical tape
  copy process is "out of band" in respects to the Netbackup  backup =
servers.=20



    =20


   -----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 Nash, Ebon
  Sent: Wednesday, June 09, 2004 1:26 PM
  To: 'Johnny Oestergaard'; Paul Esson; =
veritas-bu AT mailman.eng.auburn DOT edu
  Subject: RE: [Veritas-bu] Disk Based Backup


    We moved from disk storage units to disk staging storage units and =
took a huge performance hit.  The overhead required for disk staging, =
and apparent filesystem fragmentation due to 100% utilized filesystems, =
forced us to revert back to disk storage units.  If performance is an =
issue, be wary of disk staging storage units.


    Ebon Nash
    Compuware Corp.
      -----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 Johnny =
Oestergaard
      Sent: Wednesday, June 09, 2004 12:41 PM
      To: Paul Esson; veritas-bu AT mailman.eng.auburn DOT edu
      Subject: Re: [Veritas-bu] Disk Based Backup


      Regarding speed on disk compared to tape I would say that =
high-speed tapedrives are much faster then disk except for the time it =
takes to load and unload the tape. When the tape is at the right =
position tapes are fast. Our 9940B should be able to take around 70 MB/s =
if we could feen them that fast. I would like to see a SATA disk system =
that could take the same load as just 4 of the 9940B drives.
      In an installation using diskstaging I see one great thing that I =
think we will use and that is most of all to stage small backups and =
slow backups to disk and then let NBU stage them to tape. With a little =
luck we should be able to bring our multiplexing down and thereby speed =
tapeduplication up.

      What makes tapeduplication slow is most of all on duplexed tapes. =
We run some tests on duplication speed on backups that where not =
duplexed some years ago, and as I remember it we did this at almost the =
max speed of the drives (We did 3 tests on 9940A drives)

      I would use vault to make my off-site copies

      /johnny

      At 17:24 09-06-2004 +0100, Paul Esson wrote:

        Folks,
        =20
        I am currently deliberating over disk based backup options and =
would welcome comments from those with first hand experience. =20
        =20
        Specifically, I am trying to way up the pros and cons of using a =
Virtual Tape Library versus sharing storage out to media servers from =
say a SATA disk array.  The latter looks attractive particularly since =
the introduction in v5.0 of Disk Staging Storage Units (DSSUs).  Is =
anyone using DSSUs currently?  With VTL there seems to be the cost issue =
of licensing drives as in a regular library.
        =20
        What I would like to do is write all backups initially to disk =
but then stage the full backups to tape.  I had hoped to create two tape =
copies one to remain onsite (in a tape library) and the other to go =
offsite.  However, I am somewhat confused as to the NetBackup =
functionality required to achieve this?  If I use the DSSU the data =
appears to be migrated to tape as part of the policy anyway, but how =
would I achieve my twin copies on tape, ideally with different retention =
levels?  Do I actually require to use inline copy or even Vault =
(duplication) to achieve my end?  The concern I have with inline copy is =
that the quicker write to disk will be negated by having to write to =
tape at the same time and before the job completes.  As for Vault I =
don't know the product at all but believe it is licensed by drive (How =
does this work if your source is a disk storage unit?) and that could =
prove costly.  I have also read on this list adverse comments about =
duplication speeds, although I would be writing from disk to tape.
        =20
        All comments on any of these items very welcome.
        =20
        Regards,

        Paul Esson
        Senior Support Engineer
        Redstor Limited

        Direct:         +44 (0) 1224 595381
        Mobile:         +44 (0) 7766 906514
        E-Mail:         paul.esson AT redstor DOT com
        Web:            www.redstor.com

        REDSTOR LIMITED
        Torridon House
        73-75 Regent Quay
        Aberdeen
        UK
        AB11 5AR

        Disclaimer:
        The information included in this e-mail is of a confidential =
nature and is intended only for the addressee.  If you are not the =
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prohibited and may be unlawful.  Disclosure to any party other than the =
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        =20




    The contents of this e-mail are intended for the named addressee =
only. It contains information that may be confidential. Unless you are =
the named addressee or an authorized designee, you may not copy or use =
it, or disclose it to anyone else. If you received it in error please =
notify us immediately and then destroy it.=20



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<DIV><FONT face=3DArial size=3D2>Hi again!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I forgot to ask about veritas =
licensing... We are=20
considering to but a DL300, but our veritas sales rep. say that veritas =
hasent=20
licensed this product yet, hopefuly they will do this during june, he=20
say.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>However he also said that we probably =
we have to=20
buy 1 tape drive license for every virtual drive we create. This is kind =
a bad i=20
think because you lose some of the flexibility with the DL. Also it can =
be quite=20
expencive if we create many drives. I still consider the DL to be =
something we=20
need, and it is much sheaper than real drives.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Also, how will veritas control how many =
drives one=20
have? Maybe the license the entire DL cabinett and it will cost us much=20
money.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Who have you licensed your DL? Who do =
you think=20
veritas will do this licensing?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Best Regards</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Hampus Lind</FONT></DIV>
<DIV>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DMcDonald_Brian AT emc DOT com=20
  href=3D"mailto:McDonald_Brian AT emc DOT com">McDonald_Brian AT emc DOT 
com</A> =
</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3DEbon_Nash AT compuware DOT com=20
  href=3D"mailto:Ebon_Nash AT compuware DOT com">Ebon_Nash AT compuware DOT 
com</A> ; =
<A=20
  title=3Djoe AT joe DOT net href=3D"mailto:joe AT joe DOT net">joe AT joe DOT 
net</A> ; <A=20
  title=3Dpaul.esson AT redstor DOT com=20
  href=3D"mailto:paul.esson AT redstor DOT com">paul.esson AT redstor DOT 
com</A> ; <A =

  title=3Dveritas-bu AT mailman.eng.auburn DOT edu=20
  =
href=3D"mailto:veritas-bu AT mailman.eng.auburn DOT edu">veritas-bu AT mailman 
DOT eng.=
auburn.edu</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, June 09, 2004 =
9:34=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [Veritas-bu] Disk =
Based=20
  Backup</DIV>
  <DIV><BR></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp;The newer disk libraries based on SATA&nbsp;are very =
fast. The=20
  only tape devices &nbsp;I have &nbsp;tested that even came close to =
them in=20
  performance using Netbackup</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>is=20
  the </FONT></SPAN><SPAN class=3D020152118-09062004><FONT face=3DArial=20
  color=3D#0000ff size=3D2>IBM FC LTO Gen 2. Then, with multistreams or =
with a=20
  multistream/mulitplexed backup the difference again widens edge: the =
disk=20
  library solution.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp;&nbsp; I compared the EMC DL &nbsp;against various TLUs =

  with&nbsp;SCSI DLT 7000, SDLT 220N, SDLT320, LTO gen 1, LTO gen 2 and =
FC LTO=20
  gen 1 and gen 2.&nbsp;</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>Pushed to its&nbsp;maximum =
aggregate&nbsp;performance&nbsp;the DL=20
  </FONT></SPAN><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>will do 450 MB/s. If there is any single tape library that =
can do that,=20
  I would have to see it.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>Thats not specmanship, its actual measured performance.=20
  </FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp;&nbsp;The new DLs in many cases save you money too=20
  by</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp;-&nbsp;eliminating the SSO Option in some cases and =
still be able=20
  to share this device with multiple hosts</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>-&nbsp;Can also replicate the virtual tapes to =
</FONT></SPAN><SPAN=20
  class=3D020152118-09062004><FONT face=3DArial color=3D#0000ff =
size=3D2>physical tapes=20
  if you're obligated to do that. The end result is you need half the =
physical=20
  tapes you used to</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>need.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>- If=20
  you are trucking off line copies to a secured site, you can eliminate =
the=20
  truck middleman&nbsp;by putting the physical tape device there and =
configuring=20
  it the&nbsp;</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>DL=20
  </FONT></SPAN><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>over a DWDM link. Simply by telling NBU to eject (in this =
case virtual)=20
  tape from the virtual&nbsp;library will automatically start the copy =
to=20
  physical tape at </FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>the=20
  secured&nbsp; site. . I did this over a 200km DWDM link to a STK L180 =
with FC=20
  994B tape drives. Its tough to get double digit IO=20
  performance</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>of=20
  anything over a single DWDM link and I was doing</FONT>&nbsp;<FONT =
face=3DArial=20
  color=3D#0000ff size=3D2>17 MB/s with one stream. </FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004></SPAN><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT>&nbsp;</DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp;But the real beauty of the DL&nbsp;is the benefit of =
RAID.=20
  That&nbsp;increases the reliability of the on site backup set. When a =
tape=20
  drive fails, you lose a storage device</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>and=20
  some </FONT></SPAN><SPAN class=3D020152118-09062004><FONT face=3DArial =

  color=3D#0000ff size=3D2>aggregate performance of the TLU until the =
drive is=20
  replaced. If a disk in the DL fails, no loss of performance or storage =

  unit.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp; A tape device can run into a "bad tape experience" now =
and then=20
  doing a backup. You won't have that with a DL. Of course you could =
have that=20
  with</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>the=20
  physical TLU device the DL might optionally have as the&nbsp;archiving =
device,=20
  but thats not going to interfere with your backup window. The DL to =
physical=20
  tape</FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>copy=20
  process is "out of band" in respects to the Netbackup &nbsp;backup =
servers.=20
  </FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D020152118-09062004></SPAN><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT>&nbsp;</DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>&nbsp;&nbsp; </FONT></SPAN></DIV>
  <DIV><SPAN class=3D020152118-09062004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D020152118-09062004></SPAN><FONT face=3DTahoma><FONT =

  size=3D2><SPAN class=3D020152118-09062004><FONT face=3DArial=20
  color=3D#0000ff></FONT></SPAN></FONT></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DTahoma><FONT size=3D2><SPAN=20
  class=3D020152118-09062004>&nbsp;</SPAN>-----Original=20
  Message-----<BR><B>From:</B> veritas-bu-admin AT mailman.eng.auburn DOT edu=20
  [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of =
</B>Nash,=20
  Ebon<BR><B>Sent:</B> Wednesday, June 09, 2004 1:26 PM<BR><B>To:</B> =
'Johnny=20
  Oestergaard'; Paul Esson; =
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B>=20
  RE: [Veritas-bu] Disk Based Backup<BR><BR></DIV></FONT></FONT>
  <BLOCKQUOTE style=3D"MARGIN-RIGHT: 0px">
    <DIV><SPAN class=3D804032317-09062004><FONT face=3DArial =
color=3D#0000ff size=3D2>We=20
    moved from disk storage units to disk staging storage units and took =
a huge=20
    performance hit.&nbsp; The overhead required for disk staging, and =
apparent=20
    filesystem fragmentation due to 100% utilized filesystems, forced us =
to=20
    revert back to disk storage units.&nbsp; If performance is an issue, =
be wary=20
    of disk staging storage units.</FONT></SPAN></DIV>
    <DIV><SPAN class=3D804032317-09062004><FONT face=3DArial =
color=3D#0000ff=20
    size=3D2></FONT></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=3D804032317-09062004><FONT face=3DArial =
color=3D#0000ff=20
    size=3D2></FONT></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=3D804032317-09062004><FONT face=3DArial =
color=3D#0000ff=20
    size=3D2>Ebon Nash</FONT></SPAN></DIV>
    <DIV><SPAN class=3D804032317-09062004><FONT face=3DArial =
color=3D#0000ff=20
    size=3D2>Compuware Corp.</FONT></SPAN></DIV>
    <BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
      <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
      size=3D2>-----Original Message-----<BR><B>From:</B>=20
      veritas-bu-admin AT mailman.eng.auburn DOT edu=20
      [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]<B>On Behalf Of =
</B>Johnny=20
      Oestergaard<BR><B>Sent:</B> Wednesday, June 09, 2004 12:41=20
      PM<BR><B>To:</B> Paul Esson;=20
      veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> Re: =
[Veritas-bu] Disk=20
      Based Backup<BR><BR></FONT></DIV>Regarding speed on disk compared =
to tape=20
      I would say that high-speed tapedrives are much faster then disk =
except=20
      for the time it takes to load and unload the tape. When the tape =
is at the=20
      right position tapes are fast. Our 9940B should be able to take =
around 70=20
      MB/s if we could feen them that fast. I would like to see a SATA =
disk=20
      system that could take the same load as just 4 of the 9940B =
drives.<BR>In=20
      an installation using diskstaging I see one great thing that I =
think we=20
      will use and that is most of all to stage small backups and slow =
backups=20
      to disk and then let NBU stage them to tape. With a little luck we =
should=20
      be able to bring our multiplexing down and thereby speed =
tapeduplication=20
      up.<BR><BR>What makes tapeduplication slow is most of all on =
duplexed=20
      tapes. We run some tests on duplication speed on backups that =
where not=20
      duplexed some years ago, and as I remember it we did this at =
almost the=20
      max speed of the drives (We did 3 tests on 9940A drives)<BR><BR>I =
would=20
      use vault to make my off-site copies<BR><BR>/johnny<BR><BR>At =
17:24=20
      09-06-2004 +0100, Paul Esson wrote:<BR>
      <BLOCKQUOTE class=3Dcite cite=3D"" type=3D"cite"><FONT =
face=3Dverdana=20
        size=3D2>Folks,</FONT><BR>&nbsp;<BR><FONT face=3Dverdana =
size=3D2>I am=20
        currently deliberating over disk based backup options and would =
welcome=20
        comments from those with first hand experience.&nbsp;=20
        </FONT><BR>&nbsp;<BR><FONT face=3Dverdana size=3D2>Specifically, =
I am trying=20
        to way up the pros and cons of using a Virtual Tape Library =
versus=20
        sharing storage out to media servers from say a SATA disk =
array.&nbsp;=20
        The latter looks attractive particularly since the introduction =
in v5.0=20
        of Disk Staging Storage Units (DSSUs).&nbsp; Is anyone using =
DSSUs=20
        currently?&nbsp; With VTL there seems to be the cost issue of =
licensing=20
        drives as in a regular library.</FONT><BR>&nbsp;<BR><FONT =
face=3Dverdana=20
        size=3D2>What I would like to do is write all backups initially =
to disk=20
        but then stage the full backups to tape.&nbsp; I had hoped to =
create two=20
        tape copies one to remain onsite (in a tape library) and the =
other to go=20
        offsite.&nbsp; However, I am somewhat confused as to the =
NetBackup=20
        functionality required to achieve this?&nbsp; If I use the DSSU =
the data=20
        appears to be migrated to tape as part of the policy anyway, but =
how=20
        would I achieve my twin copies on tape, ideally with different =
retention=20
        levels?&nbsp; Do I actually require to use inline copy or even =
Vault=20
        (duplication) to achieve my end?&nbsp; The concern I have with =
inline=20
        copy is that the quicker write to disk will be negated by having =
to=20
        write to tape at the same time and before the job =
completes.&nbsp; As=20
        for Vault I don't know the product at all but believe it is =
licensed by=20
        drive (How does this work if your source is a disk storage =
unit?) and=20
        that could prove costly.&nbsp; I have also read on this list =
adverse=20
        comments about duplication speeds, although I would be writing =
from disk=20
        to tape.</FONT><BR>&nbsp;<BR><FONT face=3Dverdana size=3D2>All =
comments on=20
        any of these items very welcome.</FONT><BR>&nbsp;<BR><FONT =
face=3Dverdana=20
        size=3D2>Regards,</FONT><BR><BR>Paul Esson<BR>Senior Support=20
        Engineer<BR>Redstor=20
        =
Limited<BR><BR>Direct:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
        +44 (0) 1224=20
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595381<BR>Mobile:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +44=20
        (0) 7766=20
        =
906514<BR>E-Mail:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
        =
paul.esson AT redstor DOT 
com<BR>Web:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;=20
        <A href=3D"http://www.redstor.com/"=20
        eudora=3D"autourl">www.redstor.com</A><BR><BR>REDSTOR =
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