Tim,
but the size data buffer doesn't depend from the data buffer of the tape?
I know that the LTO3 tape have 128 MB  Data buffer....

Txs

>From: "Tim Berger" <tim.berger at gmail.com>
>To: "Bahnmiller, Bryan" <BBahnmiller at pier1.com>,   
>veritas-bu at mailman.eng.auburn.edu
>Subject: Re: [Veritas-bu] LTO3 Drive Speed Poll
>Date: Wed, 19 Jul 2006 15:24:13 -0700
>
>On 7/19/06, Bahnmiller, Bryan <BBahnmiller at pier1.com> wrote:
>>
>>  Tim,
>>
>>
>>
>>   If it's ok with you, could you send out a bit more about your setup?
>>Hosts, OS, NBU version, buffer configuration and (especially for me) what
>>kind of disk array for staging? I've been trying to get our LTO3's to 
>>stream
>>and so far have been stymied trying to pull data off of the disk ? 
>>Clariion
>>using either SATA or FC disk and have tried both RAID 5 and RAID 3. AIX
>>5.3, 2 Gb/s FC to disk and tape.
>>
>>
>>
>>   Thanks,
>>
>>     Bryan
>>
>>
>>
>>Bryan Bahnmiller
>>
>>ISD Business Continuity
>>
>>Pier 1 Imports, Inc
>>
>>817-252-8570
>>
>
>nbu 5.1 MP5 on redhat enterprise 4 using 3ware 9000S controlers with 3ware
>raid50 (striped raid 5's).  This is sata with seagate 400GB ST3400832AS
>drives.  The newer 9550SX cards are faster.  Just use the bonnie++ benchark
>or something similar to see what you raid can do.  Raid 5 will do, but I 
>get
>better write performance with "50".  I can get over 300MB/sec reads from
>these raids, well over anything i'll need from LTO3 and probably good 
>enough
>for LTO4 when that comes out.
>
>The machines are dual xenon 3.4 GHz, 2GB ram with qlogic 2322 fibre channel
>cards.
>
># cat NUMBER_DATA_BUFFERS
>16
># cat SIZE_DATA_BUFFERS
>524288
># cat SIZE_DATA_BUFFERS_DISK
>1048576
># cat NUMBER_DATA_BUFFERS_DISK
>16
># cat /usr/openv/netbackup/NET_BUFFER_SZ
>65536
># cat /etc/rc.local
>echo 134217728 >/proc/sys/kernel/shmall
>echo 134217728 >/proc/sys/kernel/shmmax
>
>Hope this helps.
>--
>-Tim


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