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10-07-2013 08:58 AM
10-07-2013 08:58 AM
Configuration:
P2000 LFF scaled down to two (2) D2600 in a daisy. All slots (36) filled with Seagate (HPs) ST3450857SS 450GB 15k SAS DP drives. Each port on the dual port controller is capable of 6Gb/ps transfer rate, however....
One drive (out of the 36) is reporting a 3.0Gb/ps transfer rate; reporting found using the P2000 SMU.
Why would the one drive report a lower transfer rate?
I presummed a port failure, but the drive should still push 6.0Gb/ps.
Additionally, am I correct to assume that if one (1) drive, in a 12 drive RAID LUN, is transfering half of the data, the entire LUN will suffer?
Solved! Go to Solution.
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10-07-2013 12:01 PM
10-07-2013 12:01 PM
SolutionDrive changing speed from 6 Gbps to 3 Gbps is normal and expected. This has been documented; the following is from page 109 of the SMU Reference Guide
“Transfer Rate. The data transfer rate in Gbit per second.
Some 6-Gbps disks might not consistently support a 6-Gbps transfer rate. If this happens, the P2000 controller automatically adjusts transfers to those disks to 3 Gbps, increasing reliability and reducing error messages with little impact on system performance. This rate adjustment persists until the controller is restarted or power-cycled.”
HP P2000 G3 MSA System SMU Reference Guide :http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02520791/c02520791.pdf
Part number: 500911-008
First edition: February 2013
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10-07-2013 12:46 PM
10-07-2013 12:46 PM
Re: One SAS drive reporting lower transfer rate
Thanks AnkitM
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10-07-2013 03:10 PM
10-07-2013 03:10 PM
Re: One SAS drive reporting lower transfer rate
If the information provided has answered your query or was helpful. Please click the KUDOS! star in the left column! :)