Firstly I must ask people to accept my apologisies if this message doesn't look right.... This is first time I have tried to post a message hear :-)
Just reading through a scenario posted by Michael Wheelock about slow tape to tape perforance... There are lots of considerations here to take note of... We run with an P660-6M1 (near enough a similar server) with a 3584 attached to four HVD SCSI LTO Drives and four FC LTO Drives (over a SAN). Each SCSI drive is attached directly to its own SCSI card in the server to max the performance. With the FC drives we can see all four over each of the four FC adapters in the server. You need to make sure you use the as few drives on one FC bus as possible... + fcs1 51-08 FC Adapter * fscsi1 51-08-01 FC SCSI I/O Controller Protocol + rmt8 51-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt9 51-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt10 51-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt11 51-08-01 IBM 3580 Ultrium Tape Drive (FCP) + fcs2 61-08 FC Adapter * fscsi2 61-08-01 FC SCSI I/O Controller Protocol + rmt12 61-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt13 61-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt14 61-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt15 61-08-01 IBM 3580 Ultrium Tape Drive (FCP) + fcs3 71-08 FC Adapter * fscsi3 71-08-01 FC SCSI I/O Controller Protocol + rmt16 71-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt17 71-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt18 71-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt19 71-08-01 IBM 3580 Ultrium Tape Drive (FCP) + fcs0 21-08 FC Adapter * fscsi0 21-08-01 FC SCSI I/O Controller Protocol + rmt4 21-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt5 21-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt6 21-08-01 IBM 3580 Ultrium Tape Drive (FCP) + rmt7 21-08-01 IBM 3580 Ultrium Tape Drive (FCP) In the example above using one drive for my explaination rmt8, rmt12, rmt16 and rmt4 are the same physical drive seen across four FC paths. so in this case I would pick rmt8. Second drive can be seen as rmt9, rmt13, rmt17 and rmt5 so I use rmt13 and so on. If you run like this then you are maxing the throughput available to each drive.... Please note the IBM recommendation is no more than 2 drives per FC adapter. With the above configuration we achieve tape-to-tape of around 40-80GB an hour (depending on data and client/server compression). A couple of other tweaks we have set in dsmserv.opt TXNGroupmax 256 MOVEBatchsize 1000 MOVESizethresh 5000 Finally on the devclass we have set the format to ultriumc. Let me know how you get on.... Cheers Andy Wilcox **************************************************************************************************** Confidentiality: This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error, use of this information (including disclosure, copying or distribution) may be unlawful. Please notify [EMAIL PROTECTED] and delete the message immediately. Security: Internet e-mail is not a 100% secure communications medium. Viruses: This e-mail (and any attachments) has been checked (using Sophos Sweep 3.63 + patches) and found to be clean from any virus infection before leaving. Therefore neither Aquila Networks Services Ltd nor Midlands Electricity plc or any of their group undertakings (as defined by the Companies Act 1989) (together referred to as the "Companies") accept legal responsibility for this message or liability for the consequences of any computer viruses which may have been transmitted by this e-mail. Monitoring: All electronic communications with the Companies may be monitored in accordance with the UK Regulation of Investigatory Powers Act, Lawful Business Practice Regulations, 2000. If you do not consent to such monitoring, you should contact the sender of this e-mail. Aquila Networks Services Limited, Registered office: Whittington Hall, Whittington, Worcester, WR5 2RB Registered in England and Wales number 3600545 This e-mail may be sent on behalf of any of the Companies. ****************************************************************************************************
