With the NDMP backups, the filers are directly backing up to the tape
drives over the switch. The SUN isn't involved.

----
Matthew Huff           | One Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA LLC                | Phone: 914-460-4039 
http://www.otaotr.com  | Fax:   914-460-4139    

> -----Original Message-----
> From: Howard Martin [mailto:howard.martin AT EDS DOT COM] 
> Sent: Thursday, March 11, 2004 11:01 AM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] Slow filer backups
> 
> 
> On Thu, 11 Mar 2004 15:40:43 -0000, Krishnan, Ramamurthy 
> (Temp) <Ramamurthy.Krishnan AT KPMG.CO DOT UK> wrote:
> 
> >The sun machine is a E250.  LTO is LTO-1 in an ATL P7K library.  We 
> >are'nt using compression and the average backup time runs to 
> more than 
> >double of what you specify.
> >
> >Thanks
> >
> >- Krishnan
> >
> Ah the E250 will only handle about 50MBytes/sec on Gigabit 
> ethernet (varies slightly depending on the processor speed, 
> so that is probably your bottle neck, if you could try the 
> same setup on a 280R/240R/V480/V880 you might double your 
> throughput. You might get some improvement through using 
> client side compression (directive with compressasm) but it 
> might strain your filers. If you want to check my diagnosis 
> then run bigasm tests on the backup server and then on the 
> filers which will show more clearly (but not
> exactly) where the botlenack is - see previous posts on this 
> list for using bigasm. The other problem with an E250 is that 
> is doesn't have many slots you must be careful that the i/o 
> rate of the aggregate of the drives on a single SCSI bus 
> doesn't greatly exceed the i/o rate of the bus. Again the use 
> of bigasm would indicate what the maximum i/o rate to your 
> drives would be.
> 
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