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тАО05-13-2004 10:16 PM
тАО05-13-2004 10:16 PM
I have searched the forums and cannot find any discussions that address the merits and drawbacks of each method. Am I right in concluding that several disks allow HP-UX to manage disk queues better (with no impact on performance)?
Share and Enjoy! Ian Dennison
Solved! Go to Solution.
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тАО05-13-2004 10:42 PM
тАО05-13-2004 10:42 PM
SolutionHave a look at this link.
Hope this helps..
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=586590
with best wishes
Naveej
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тАО05-13-2004 11:40 PM
тАО05-13-2004 11:40 PM
Re: Merits of 1 massive EVA disk vs several small
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=254146
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=550429
Regards,
Jean-Luc
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тАО05-14-2004 02:12 AM
тАО05-14-2004 02:12 AM
Re: Merits of 1 massive EVA disk vs several small
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тАО05-14-2004 02:50 AM
тАО05-14-2004 02:50 AM
Re: Merits of 1 massive EVA disk vs several small
Interesting question: if you have 1 disk queue dealing with many disks requests (and queueing), is this faster or slower than many disks with their own queues.
Can HP-UX only work on 1 disk request at a time? Is one long disk queue just as manageable / efficient as several short disk queues?
Look forward to your thoughts. Share and Enjoy! Ian
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тАО05-14-2004 03:14 AM
тАО05-14-2004 03:14 AM
Re: Merits of 1 massive EVA disk vs several small
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тАО05-14-2004 05:43 AM
тАО05-14-2004 05:43 AM
Re: Merits of 1 massive EVA disk vs several small
HP-UX can, of course, work with multiple I/O requests at a time. The queue length specifies the maximum number of 'in flight' I/O operations. A value too high will overrun the disk array - the array can tell the server to throttle back, but it depends on the quality of the drivers in the operating system if the server obeys.
A single I/O queue allows the array to better recognize certain I/O patterns like sequential I/O, so it can do read-aheads. That won't work with host-based striping.