Don't forget that one performance factor is file type. Biggest will gain more
performance than smaller.
Best Regards,
Wira Chinwong
SCSi Co., Ltd.
2521/69 Biztown Ladprao Rd.,
Klongchaokhunsingha, Wangthonglang, Bangkok 10310
Tel 02-9559873-4 Fax 02-9559875 ext 5
Mobile: 086-9092992
E-mail: wira AT scsi.co DOT th
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Gary Bowers
Sent: Tuesday, May 03, 2011 9:04 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] LTO5 performance
Thanks Charles. Yes, these are issues to consider. I was really just
looking to see what other people were getting. HBA's are dedicated 4/
HBA on 8 Gbit cards. I have a feeling it is a device driver issue, or
an issue with the IO cards in the Quantum. Since they are HP drives,
I have to use the TSM device driver, and not Atape. Just checking to
see if anyone else has experienced LTO5 not living up to published
speeds.
Also, I can read off the disk subsystem at 1000+ MB/s, so I'm
confident that the system is able to push data fast enough. I am
getting proportional speed increases with number of drives. IE 2
drives gives 100 MB/s and 8 gives 400 MB/s over 1-2 hours.
Thanks all.
On May 3, 2011, at 8:22 AM, Hart, Charles A wrote:
> Few things to consider
>
> 1) Are the HBA's for the LTO5 Drives dedicated or do they have other
> devices.
>
> 2) How many LTO drives per HBA?
>
> 3) Speed of Fibre 2/4/8Gb
>
> ....
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On
> Behalf Of
> Gary Bowers
> Sent: Monday, May 02, 2011 9:39 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] LTO5 performance
>
> Just a quick poll of what people are seeing for LTO-5 performance. Is
> it anywhere close to the rated 140 MB/s native, or much lower? I ask,
> because I have a customer that is only getting about 40-50 MB/s from
> HP
> LTO5 drives in a Quantum library. This number seems really low to me,
> but before I jump to making recommendations, I would like to have some
> real world numbers to go off of. You'd think Google would find some,
> but my searches turned up nill.
>
> As an aside, has anyone had performance problems with Quantum
> libraries
> and their built-in Fibre Switches?
>
> OS is AIX 6, having the same performance from both TSM server, AIX and
> Solaris 10 LanFree.
>
> Thanks for sharing :)
>
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