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тАО03-06-2009 03:19 PM
тАО03-06-2009 03:19 PM
Besides know difference stated on the web, what is really difference between series of EVA in terms of fault tolerance ?
damiri
Solved! Go to Solution.
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тАО03-06-2009 04:43 PM
тАО03-06-2009 04:43 PM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
So there's no single point of failure. The M6412 disk enclosure uses CTS switches, so it's faster and better at insolating problems than an EVA4000 and more similar to an EVA6100.
Of course, if going for availability, it's better to have more than one disk group. But the probability of 2 disks failing on the same RSS in a few hours is very low.
And with the new 09500000 firmware you can create RAID 6 vdisks.
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тАО03-07-2009 12:01 AM
тАО03-07-2009 12:01 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-07-2009 12:29 AM
тАО03-07-2009 12:29 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
EVA 4400 is designed for no single point of failure:
http://h18000.www1.hp.com/products/quickspecs/12893_div/12893_div.pdf
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тАО03-07-2009 04:11 AM
тАО03-07-2009 04:11 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-07-2009 04:29 AM
тАО03-07-2009 04:29 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
If you are reselling the EVA then I would expect you to know how best to set it up.
Yes the EVA is fault tolerant, but like any system, if set up incorrectly, or used incorrectly then things can go wrong.
Can you share the specifics of the problems your customers have had ?
I'll take a guess that they instigated from not quickly replacing failed disks.
Cheers,
Rob
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тАО03-07-2009 05:49 AM
тАО03-07-2009 05:49 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-07-2009 08:35 AM
тАО03-07-2009 08:35 AM
SolutionTheoretically the I/O module or the controller should detect this and bypass that disk, but depending on the controller and disk firmware this does not happen always and sometimes the thing ends in a lot of LIPs sent to all loops and all communication lost.
This is less probable on an EVAx100 or EVAx400, since the I/O modules are now switches, and insolate the traffic for each disk (or that's the idea).
In the EVA4400 the most important thing is to keep all firmwares updated. There are a lot of issues updated and corrected since the initial launch.
Firmware 09500000 is already on the FTP and has many fixes and new features.
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тАО03-07-2009 08:52 AM
тАО03-07-2009 08:52 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
Can you send me link for new 09500000 and is there updated firmware for WOCP with CV since this is almost not usable at all ?
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тАО03-07-2009 02:40 PM
тАО03-07-2009 02:40 PM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
The management module firmware will be updated too to contain Command View 9 instead of 8.1.