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04-15-2005 07:19 PM
04-15-2005 07:19 PM
msa-20 preformance problem
We have 4 msa-20 systems. Each connected dl360G4 using ms6402 controller. We have notice that the new MSA-20 are performing slow relative (5MBps) to the new one (65MBps) for writing on raid-5. After a system check we found the battery on the MSA-20 is not charge and the accelerator is disabled.
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04-17-2005 08:57 AM
04-17-2005 08:57 AM
Re: msa-20 preformance problem
I doubt most people would know the MSA20 actually has cache internally.
And that its battery backed up.
Andy
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04-18-2005 12:47 AM
04-18-2005 12:47 AM
Re: msa-20 preformance problem
The MSA20 is not just a JBOD like the MSA30, it is actually a smart-JBOD. As stated it contains a controller and battery backed cache.
Glenn
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05-19-2005 04:25 AM
05-19-2005 04:25 AM
Re: msa-20 preformance problem
But when I open the acu I see 2 smartarray controlles (this is normal) and 2 msa20 controllers (??).
The 2 smartarray controllers say they don't have any disks attached. And on the msa20 I can create sata array's.
On 1 of the msa20 controller I have a lot more configuration options (cache settings, rebuild priority,...). On the other I can just create array's an logical volume and he gisves a warning about battery low (is this normal -> problem with the battery in the encloser?).
Another problem I have is that I can't do an expand of a logical volume or array and I can't create an array over the 2 boxes.
I have put the msa20, SA 6404 into the latest FW + windows driver and acu are also into the latest version (smart start 7.30)
thanks Koen
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05-19-2005 04:33 AM
05-19-2005 04:33 AM
Re: msa-20 preformance problem
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05-19-2005 06:35 AM
05-19-2005 06:35 AM
Re: msa-20 preformance problem
Can you disable the msa controllers? Is this why you can't extend a logical volume?
Where in the documetation can you find this?
thanks
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05-19-2005 06:47 AM
05-19-2005 06:47 AM
Re: msa-20 preformance problem
A SA6404 runs SCSI at the back-end, yes, but I have not heard that you can connect the MSA20 to an arbitrary SCSI host bus adapter, sorry. You cannot really disable the MSA20 embedded controller. Even if you connect it to an MSA1500, the embedded SA will encapsulate any SATA disk into a JBOD and present it to the MSA.
* WARNING * WARNING * WARNING * WARNING *
You will loose all data if you move the MSA20 from a backplane SA to the MSA1500 - Dts (DAS to SAN) does not work here!
* WARNING * WARNING * WARNING * WARNING *
Didn't you write that the affected array has a battery low problem? I would fix this first and then look if the problem persists. It is not uncommon on storage controllers that certain functions are disabled when the cache battery has a low charge.
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05-19-2005 09:06 AM
05-19-2005 09:06 AM
Re: msa-20 preformance problem
So I only need to configure the msa controllers?
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