On 30 April 2010 00:20, Dean <dean.deano AT gmail DOT com> wrote:
> Ah.... LTO1. I remember those.
>
> In that case, multistreaming the backup to 2 drives has a good chance of
> speeding things up.
>
> You'll have to modify your backup policy's selection list to split up the
> backup into streams, using the NEW_STREAM directive. Alternatively, if the
> client has several large filesystems or partitions, you could just have
> ALL_LOCAL_DRIVES in the selection list, and make sure "enable multiple
> streams" is on.
>
> Then modify your storage unit to use two drives, but leave multiplexing per
> drive at 1.
>
> When you run your bpduplicate later, a single bpduplicate will only use two
> drives at any time, I believe (one for read, one for write).
>
> Cheers,
> Dean
>
> On Fri, Apr 30, 2010 at 9:12 AM, Feroz Basir <feroz.basir AT gmail DOT com> wrote:
>>
>> Hi,
>>
>> LTO1 tape drive. 33 MB/s.
>>
>> On 30 April 2010 00:03, Dean <dean.deano AT gmail DOT com> wrote:
>> > What type of tape drive is it and what speed are you getting at the
>> > moment?
>> >
>> >
>> > On Fri, Apr 30, 2010 at 8:21 AM, Feroz Basir <feroz.basir AT gmail DOT com>
>> > wrote:
>> >>
>> >> My backup is not going through the network. Tape library is attached
>> >> directly to server. I'm hoping to get better time here if I use 2 tape
>> >> drives at the same time (multi-stream). So, 2 tapes drive = 2 streams
>> >> I guess.
>> >>
>> >> As for multiplexing setting, by default it set to 1 which is what I
>> >> have
>> >> now.
>> >>
>> >> On 29 April 2010 23:02, Chapman, Scott <Scott.Chapman AT icbc DOT com> wrote:
>> >> > If you multistream, you will have a different backup id for each
>> >> > individual stream, so you will be able to dup those backup images
>> >> > separately, thus continue to use one read drive and one write drive.
>> >> >
>> >> > Are you sure that writing your backup with 2 drives is going to
>> >> > decrease
>> >> > your backup time that much?  You need to confirm where the bottleneck
>> >> > is
>> >> > first.  If you find that you are killing the disk on the client, and
>> >> > if
>> >> > 2 streams means that you will be reading from 2 separate disks, then
>> >> > will your network handle that?  I guess I'm saying, just don't be to
>> >> > sold on getting twice the backup speed just because you're now using
>> >> > two
>> >> > drives...
>> >> >
>> >> > HTH.
>> >> >
>> >> > Scott Chapman
>> >> > Senior Technical Specialist
>> >> > Storage and Database Administration
>> >> > ICBC - Victoria
>> >> > Ph:  250.414.7650  Cell:  250.213.9295
>> >> >
>> >> > -----Original Message-----
>> >> > From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
>> >> > [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Feroz
>> >> > Basir
>> >> > Sent: Thursday, April 29, 2010 1:53 PM
>> >> > To: veritas-bu AT mailman.eng.auburn DOT edu
>> >> > Subject: [Veritas-bu] duplicate multi-stream backup tape
>> >> >
>> >> > Hi,
>> >> >
>> >> > I have 2 tape drives. Our backup is running too long now and been
>> >> > using 2 media tapes (one after another). I'm using bpduplicate to
>> >> > duplicate our backup tapes.
>> >> >
>> >> > Thinking of running our backup in multistream job to utilise 2 tape
>> >> > drives at the same time and save backup time. Hoping our backup time
>> >> > would be downed by half. My concern is during duplicate process. Do I
>> >> > need 4 tape drives in order to run multistream tape that use 2 tapes?
>> >> > How does one run duplicate job on multistream backup tapethat use
>> >> > more
>> >> > than one tape?
>> >> >
>> >> > Thanks for your input.
>> >> >
>> >> > --
>> >> > ------------
>> >> > regards,
>> >> > Feroz Basir
>> >> > _______________________________________________
>> >> > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>> >> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>> >> > ------------------------------------------------------------
>> >> > This email and any attachments are intended only for the named
>> >> > recipient and may contain confidential and/or privileged material.
>> >> > Any unauthorized copying, dissemination or other use by a person
>> >> > other than the named recipient of this communication is prohibited.
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>> >> > please notify the sender and destroy all copies of this email
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>> >> >
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> ------------
>> >> regards,
>> >> Feroz Basir
>> >> _______________________________________________
>> >> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>> >> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>> >
>> >
>>
>>
>>
>> --
>> ------------
>> regards,
>> Feroz Basir
>
>