Your RAID-5 array ay not be fast enough for the tape drive. LTO-1 drives, with compression enabled, may need the disk to be read at 60 MB/second to keep the tape streaming. Most systems cannot sustain such a rate. Your best alternative is to turn the compression off on the drives. You may use more tape, but you have a better chance of achieving 15 MB/second writes to the tape.
Orville L. Lantto Datatrend Technologies, Inc. (http://www.datatrend.com) IBM Premier Business Partner 121 Cheshire Lane, Suite 700 Minnetonka, MN 55305 Email: [EMAIL PROTECTED] CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. "Coats, Jack" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[email protected]> 01/26/2005 10:15 AM Please respond to "ADSM: Dist Stor Manager" <[email protected]> To [email protected] cc Subject How to get a tape drive to stream? But does someone have a pointer to some 'tips & tricks' or FAQ to help me get these LTO tape drives streaming with TSM on Windows 2000? The drives seem to be doing about 3MB/sec per drive, no matter what is going on in the server. This is about the right speed for stop/start programmed I/O processing. My config is TSM 4.3 on Windows 2K server (2 1.2G Xenon, 1G RAM) My SCSI attached LTO-1 drives are on Adaptec controllers (IBM branded), with two tape drives per controller. I have 3 identical SCSI controllers with two drives each (one also has my 3583 library on it). Disks (6 72G 10K drives, in two partitions) are attached to one RAID card, and are RAID 5. I can't get just running a single tape drive streaming, with nothing going on in my system (db backup only, no backups, no reclamation, no expiration, etc) Any advice/suggestions are appreciated. ... ... Desperate in Houston ... JC
