Just got another 7-8MB/s by setting my tape drive to use a bigger block 
size.

05:55:29.086 [6617] <4> write_backup_completion_stats: successfully wrote 
2 of 2
multiplexed backups, total Kbytes 2099012 at 138420.733 Kbytes/sec

138MB/s!!

On Wed, 12 Jul 2006, Len Boyle wrote:

> Justin,
>
> Can you tell the list a little more about your test bed, that you used for 
> this test.
>
> Thanks len boyle
>
> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-bounces 
> at mailman.eng.auburn.edu] On Behalf Of Justin Piszcz
> Sent: Wednesday, July 12, 2006 8:02 AM
> To: Paul Keating
> Subject: Re: [Veritas-bu] LTO3 Drive Speed Poll
>
> Just did a test, 7 files backing up (1.0GB each which contain ASCII text) get 
> 115MB/s or so sustatined.  Still should be getting 160MB/s or more.
>
> On Wed, 12 Jul 2006, Paul Keating wrote:
>
>>> From http://www.openstore.com/tape-lto3vsdlt600.htm
>>
>> LTO3 spec is 80MB/s Native, and 160MB/s Compressed.
>>
>> I would rarely expect more than 100MB/s sustained unless you were
>> backing up huge, multi-gig, uncompressed ASCII text files direct from
>> highspeed disk to fiber attached tape drives.
>>
>> Paul
>>
>> --
>>
>>
>>> -----Original Message-----
>>> From: veritas-bu-bounces at mailman.eng.auburn.edu
>>> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of
>>> Justin Piszcz
>>> Sent: July 11, 2006 5:52 PM
>>> To: veritas-bu at mailman.eng.auburn.edu
>>> Subject: [Veritas-bu] LTO3 Drive Speed Poll
>>>
>>>
>>> The group I work with is expecting 160-200MB/s megabytes per second
>>> on an
>>> LTO3 with compression.  I did some tests today with 7 RAID1 SCSI
>>> drives.
>>>
>>> 67GB x 7
>>>
>>> On each volume was 3 20GB tar files.
>>> I got 78-82MB/s sustained total, 12-16MB/s on each thread (7
>>> multistreamed).
>>>
>>> The tar files are representative of a typical file system in our
>>> environments.
>>>
>>> What speeds have other members gotten when doing speed testing to
>>> LTO3 drives?
>>>
>>> Justin.
>>>
>>> _______________________________________________
>>> Veritas-bu maillist  -  Veritas-bu at mailman.eng.auburn.edu
>>> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>>>
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