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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.
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тАО03-07-2009 02:43 PM
тАО03-07-2009 02:43 PM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-08-2009 10:26 AM
тАО03-08-2009 10:26 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=CommandViewEVA9.0
(In my opinion, the WOCP is only suitable for some emergency management tasks and is *NOT* a replacement for a management server, because important things like call home or online disk drive firmware updates are not available)
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тАО03-08-2009 02:38 PM
тАО03-08-2009 02:38 PM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-09-2009 01:36 AM
тАО03-09-2009 01:36 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=471497&prodTypeId=18964&objectID=c01625532
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тАО03-17-2009 03:13 AM
тАО03-17-2009 03:13 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
I have just been involved with an EVA4400 install. We noted that with the EVA 4400 you only seem to be able to shut down both controllers at the same time and not individually.
Also, the controllers aren't labelled as hotswap.
I take this to mean that if we have a controller failure we will need to schedule downtime for the whole eva to install the replacement controller?
We did some basic testing as we are not at the production stage yet. Basically we have a couple of disk groups and published vdisks. We pulled power supplies/ batteries / fans / loop cables / etc, Command View seems slightly more responsive than older versions but still quite slow and often not displaying the fault for quite some time.
We also disconnected all loop ports and device ports from Controller B to try and simulate a Controller failure. Command View basically froze up and was unresponsive. We have tested the MPIO drivers since on our management host and they are working correctly. Has anyone else tested and experienced anything like this?
Cheers,
James
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тАО03-17-2009 03:50 AM
тАО03-17-2009 03:50 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
Comand View only talks to the master controller, if you remove the FC cables from that one, Command View will not be able to access the EVA.
It's not the same a controller with the ports disconneted that a failed controller.
Also, EVA4400 can be shut down individually, in fact it's stated on the controller replacement instructions:
a. In the navigation pane, select Storage System > Hardware > Controller Enclosure.
b. Select the appropriate controller (Controller 1 or Controller 2) to halt.
c. Click the Shut down tab.
d. In the Halt Controller section of the Shut Down Controller window, click Halt. This halts controller processing while the power remains on.
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тАО03-17-2009 08:28 AM
тАО03-17-2009 08:28 AM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-17-2009 12:34 PM
тАО03-17-2009 12:34 PM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
If your master controller goes down does this role automatically switch to the second controller or do you lose access to commandview during this stage?
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тАО03-17-2009 01:45 PM
тАО03-17-2009 01:45 PM
Re: EVA4400: how fault tolerant it is ?; Difference with EVA6X00/8X00
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тАО03-17-2009 01:53 PM
тАО03-17-2009 01:53 PM