David, Check the FILE/TTY Readch and Writech numbers while only one drive is active on the system. Our system is small enough that we get that one-drive-active condition.
Thanks. Tab David Longo <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 02/13/2002 06:31:54 PM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Re: 3584 amd SDG R03 How do use "topas" to report on Tape drive throughput? I have topas on AIX 4.3.3 ML9 and TSM server 4.2.1.9 and IBM 3584 library through McData switches. David Longo >>> [EMAIL PROTECTED] 02/13/02 07:13PM >>> Eric, That with "drive compression" turned on - device class format = drive. That number comes from "topas" which is measuring OS activity and reports physical bytes, not TSM's logical bytes. Thanks. Tab "Loon, E.J. van - SPLXM" <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 02/12/2002 03:06:18 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Re: 3584 amd SDG R03 Hi Tab! Is that compressed? I spoke about native, so uncompressed. Kindest regards, Eric van Loon KLM Royal Dutch Airlines -----Original Message----- From: Tab Trepagnier [mailto:[EMAIL PROTECTED]] Sent: Monday, February 11, 2002 23:14 To: [EMAIL PROTECTED] Subject: Re: 3584 amd SDG R03 Eric, Our 3583 uses HVDS drives and we see peak rates of over 12 MB/s per drive as reported by topas. Tab Trepagnier TSM Administrator Laitram Corporation "Loon, E.J. van - SPLXM" <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 02/11/2002 03:33:50 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Re: 3584 amd SDG R03 Hi Daniel! The SAN Data Gateway uses High Voltage Differential SCSI interfaces by default. If your are using the default SCSI interfaces, your drives will probably be also HVD drives. They perform considerably less then the Low Voltage Differential drives. The specs on the IBM pages (sustained data transfer rate 15MB/sec native) are LVD transfer rates. You will never achieve this with HVD SCSI. However, 2.5 MB/sec is very slow. What's the SAN Data Gateway's microcode level? Kindest regards, Eric van Loon KLM Royal Dutch Airlines -----Original Message----- From: Daniel Sparrman [mailto:[EMAIL PROTECTED]] Sent: Monday, February 11, 2002 06:58 To: [EMAIL PROTECTED] Subject: 3584 amd SDG R03 Hi We have a 3584 with 3 drives; 2 are SCSI attached through a San Data Gateway R03, and one drive is direct FC attached to a switch. We're using this library with a IBM P-Series 610 with one FC adapter. The problem is that the performance of the 2 SCSI drives attached to the SDG is very poor. The FC drive has a good performance and can reach speeds up to 27MB/s, but the SDG will only reach about 4-5MB/s, which shoulod mean 2-2.5MB/s per drive. The 3584 drives(both SCSI and FC) are upgraded to the last level of firmware(was done a week ago), and the library is at level 2250. Is this a know problem with the San Data Gateway? We should at least be able to reach about 10-15MB/s thought the SAN Data Gateway. Appreciates any help I can get. Best Regards Daniel Sparrman ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. 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