The system is E420 with 4 CPU and 4 Gb of Ram. When loading the Sybase database from an AIT or DLT tape drive, the CPU wait state is at 100% and the system is nearly unusable until the load is finished. Loading from disk is only 50% wait time. We have almost 100 systems that we can duplicate this problem on. My guess is the SCSI bus bandwidth needs to be adjusted if possible or move the tape drive to a different controller card. Can the bandwidth be modified and how is it done? Any suggestions will help.
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AIT Tape on Internal SCSI is Resource HOG
- Thread starter johnnyjb
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Does this happen when reading the tape from CPIO, or only when loading the software through the installer process?
It sounds like a program is "polling" for data instead of waiting for it. In the case of a "polling" program, it's possible to bring any system to it's knees. Consider a program that asks 300 times a second if the next byte is ready for download from an internet site. Most programs say, "let me know when it's ready" - and the systems 'sleeps' them.
It would be like the proverbial child asking "are we there yet" while on the way to Alaska (from Florida). It wears on the system the same as one's nerves.
It sounds like a program is "polling" for data instead of waiting for it. In the case of a "polling" program, it's possible to bring any system to it's knees. Consider a program that asks 300 times a second if the next byte is ready for download from an internet site. Most programs say, "let me know when it's ready" - and the systems 'sleeps' them.
It would be like the proverbial child asking "are we there yet" while on the way to Alaska (from Florida). It wears on the system the same as one's nerves.
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