We are using NBU 3.4.1GA with LTO drives when we use 1 drive we get 23mbps throughput but if we span 4 drives each drive slows down to 8mbps. Veritas are not being very helpfull they have said that it must be the network but I can't really see that at all it's all on gigabit backbone.
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slow down when spanning drives
- Thread starter dazzagp
- Start date
Maybe a bottle neck on the HBA (Host bus adapter) - would not really recommend more than 1 or 2 drives per HBA do you have 4 drives on one HBA?
Are the stats better for spanning 2 drives that just one drive - then 3 drives....?
Does the issue get worse after 2 drives? or after 3 drives or after 4 drives?
How are the drives connected? SAN? Local?
You mention Gigabit - there are some issues on certain vendors cards due to driver issues - Compaq cards you really need the latest drives. The compaq cards are OEM from Intel - try there driver or the latest Compaq driver, that it if you have a compaq Gigabit card.
Are the stats better for spanning 2 drives that just one drive - then 3 drives....?
Does the issue get worse after 2 drives? or after 3 drives or after 4 drives?
How are the drives connected? SAN? Local?
You mention Gigabit - there are some issues on certain vendors cards due to driver issues - Compaq cards you really need the latest drives. The compaq cards are OEM from Intel - try there driver or the latest Compaq driver, that it if you have a compaq Gigabit card.
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