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тАО05-19-2009 08:53 AM
тАО05-19-2009 08:53 AM
EVA 8400 Processor Speed
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тАО05-19-2009 09:26 AM
тАО05-19-2009 09:26 AM
Re: EVA 8400 Processor Speed
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
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тАО05-19-2009 11:08 AM
тАО05-19-2009 11:08 AM
Re: EVA 8400 Processor Speed
Moving to 4 or 8 GB of cache per controller, and to SSD drives gives a much bigger performance improvement.
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тАО05-19-2009 11:35 AM
тАО05-19-2009 11:35 AM
Re: EVA 8400 Processor Speed
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тАО05-19-2009 12:03 PM
тАО05-19-2009 12:03 PM
Re: EVA 8400 Processor Speed
The 8400 has 20% more performance, 3 independent loop pairs with 9 enclosures, 108 drives per loop.
The limit for I/O are always the disk drives. Assumming a typical 8K I/O size, and a maximum 150 I/Os per drive (15K drives), that's 1.2 MB/s per drive or 130 MB/s per loop. The backend is all 4 Gb/s, so...
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тАО05-19-2009 12:36 PM
тАО05-19-2009 12:36 PM
Re: EVA 8400 Processor Speed
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тАО05-19-2009 01:54 PM
тАО05-19-2009 01:54 PM
Re: EVA 8400 Processor Speed
Not enough addresses to have 10 enclosures per loop. Anyway, the I/Os are daisy-chained, a packet has to pass through several I/Os to reach it's destination disk. Not good to have too many.
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тАО09-01-2009 09:35 AM
тАО09-01-2009 09:35 AM
Re: EVA 8400 Processor Speed
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тАО09-01-2009 10:29 AM
тАО09-01-2009 10:29 AM
Re: EVA 8400 Processor Speed
there is a german saying: "Haette, waere, wenn". You need 108 drives, with each drive delivering 150 IOPS with 256k IOs to fill up a 4 GB backend-loop. Sure you can do this, but that's theory.
Think about EMC├В┬▓ CLARiiONs which are still using Intel P4 CPUs on their storage processor.
The limiting factor are the loops, not the controller. The cache upgrade is more marketing then true need. HP no differs anymore the cache in differnt parts, cache is cache.
Best regards,
Patrick
Patrick
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тАО09-01-2009 08:50 PM
тАО09-01-2009 08:50 PM
Re: EVA 8400 Processor Speed
Check this PDF: http://hp.sharedvue.net/sharedvue/resources/tsg-fg-storageworks_array.pdf
Rgds-Kranti