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тАО12-10-2005 07:22 PM
тАО12-10-2005 07:22 PM
Mixing drive types in MSA1000
First array which will have 8nos of 10K RPM disks which spread across all for scsi channel and second array which will have 8nos of 15K rpm hard disks which again spread across all four scsi channels of MSA1000.
Whether I will get better performance on the second array?
Regards
Manoj
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тАО12-10-2005 11:27 PM
тАО12-10-2005 11:27 PM
Re: Mixing drive types in MSA1000
If all the drives in the array have the same characteristics, and evenly distributed..... then yes it should give higher performance than the other slower array.
I assume the RAID setup will be the same ?
Jeff
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тАО12-10-2005 11:33 PM
тАО12-10-2005 11:33 PM
Re: Mixing drive types in MSA1000
My question is as the same SCSI bus holding 10K rpm and 15 K rpm disks, whether the speed will reset to the lower one.
Regards
Manoj
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тАО12-11-2005 05:10 AM
тАО12-11-2005 05:10 AM
Re: Mixing drive types in MSA1000
On SmartArray controllers, the transfer speed is individually negotiated between the controller and the disk drive, so an Ultra-2 disk drive will transfer with U2 speeds, but a U320 disk drive can transfer with U320 speeds if the controller permits it. As the MSA1000 can't do that - it will just transfer with U3 speed, but not get told to switch down to U2.
Other controllers, e.g. from pre-merger HP behave differently, I got told. Still, a 10k drive will rotate with 10kRPM and a 15k drive with 15kRPM.
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тАО12-11-2005 03:05 PM
тАО12-11-2005 03:05 PM
Re: Mixing drive types in MSA1000
Anybody has got any whitepaper on this subject?
Regards
Manoj
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тАО12-12-2005 01:44 AM
тАО12-12-2005 01:44 AM
Re: Mixing drive types in MSA1000
The rotational speed of the drive only effects how faster the actual drive can read and write the data sent and received from the controller.
In terms of saving data, a faster drive could write more data/second, sending a ready to the controller more qiuckly. But in terms of total system performance, it will depend on the controllers ability to process the data to be sent. It may be, say in the case of a 642, no noticable difference would be seen in 10K vs 15K, since the 642 is so slow in writing data to the disk subsystem.
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тАО12-12-2005 01:50 AM
тАО12-12-2005 01:50 AM
Re: Mixing drive types in MSA1000
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тАО12-12-2005 01:53 AM
тАО12-12-2005 01:53 AM
Re: Mixing drive types in MSA1000
Regards
Manoj