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: w...@scsi.co.th -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Gary Bowers Sent: Tuesday, May 03, 2011 9:04 PM To: ADSM-L@VM.MARIST.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@VM.MARIST.EDU] On > Behalf Of > Gary Bowers > Sent: Monday, May 02, 2011 9:39 PM > To: ADSM-L@VM.MARIST.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 :) > > This e-mail, including attachments, may include confidential and/or > proprietary information, and may be used only by the person or entity > to which it is addressed. If the reader of this e-mail is not the > intended > recipient or his or her authorized agent, the reader is hereby > notified > that any dissemination, distribution or copying of this e-mail is > prohibited. If you have received this e-mail in error, please notify > the > sender by replying to this message and delete this e-mail immediately.