Dell PERC Question (Server Down)
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@BRRABill said in Dell PERC Question (Server Down):
@scottalanmiller said
You install directly to XenServer's Dom0 which has hardware access.
I was going to ask about this in my roadtrip of XS.
So, then how do you access it? From a web browser just like any other OMSA install?
Dom0 is just an operating system, CentOS in XenServer. It would host the application as if it were installed on any other server.
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@scottalanmiller said in Dell PERC Question (Server Down):
That's anther good reason that we don't normally think of for installing to SD/USB.
Did you see my post about the speed of my USB2 booted test XS. It is SO SLOW.
Is that normal since it is USB2?
Would SD be any quicker? though for the few times you update/reboot, perhaps the speed at boot/update isn't an issue.
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@BRRABill said in Dell PERC Question (Server Down):
@scottalanmiller said in Dell PERC Question (Server Down):
That's anther good reason that we don't normally think of for installing to SD/USB.
Did you see my post about the speed of my USB2 booted test XS. It is SO SLOW.
Is that normal since it is USB2?
Would SD be any quicker? though for the few times you update/reboot, perhaps the speed at boot/update isn't an issue.
No, I missed it. How slow was it?
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@coliver said
Dom0 is just an operating system, CentOS in XenServer. It would host the application as if it were installed on any other server.
I'm confused as to why it matter you can't administer it if XS boots off the same array, then.
I could access OMSA from my desktop browser.
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@BRRABill said in Dell PERC Question (Server Down):
@coliver said
Dom0 is just an operating system, CentOS in XenServer. It would host the application as if it were installed on any other server.
I'm confused as to why it matter you can't administer it if XS boots off the same array, then.
I could access OMSA from my desktop browser.
If you were installing it onto an SD card or USB stick it wouldn't matter.
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@scottalanmiller said
No, I missed it. How slow was it?
Pretty slow. But of course I was going from using a SSD.
It took the good part of an afternoon to install all the updates once I had it installed.
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@coliver said
If you were installing it onto an SD card or USB stick it wouldn't matter.
Why would that even matter? Unless we are talking some sort of destructive operation to the array...
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@BRRABill said in Dell PERC Question (Server Down):
@coliver said
If you were installing it onto an SD card or USB stick it wouldn't matter.
Why would that even matter? Unless we are talking some sort of destructive operation to the array...
I guess I'm not following, you were asking how to access something installed on Dom0. Did I misunderstand the question?
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@coliver said
I guess I'm not following, you were asking how to access something installed on Dom0. Did I misunderstand the question?
@scottalanmiller said you could administer the array from a VM as long as it wasn't on the same array. I didn't understand why that would matter. Obviously if you werer going to torch the array, then yes. But why else would it matter?
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@BRRABill said in Dell PERC Question (Server Down):
@coliver said
If you were installing it onto an SD card or USB stick it wouldn't matter.
Why would that even matter? Unless we are talking some sort of destructive operation to the array...
Right, rebooting is potentially destructive and why it is not recommended. It adds risk.
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@BRRABill said in Dell PERC Question (Server Down):
@coliver said
I guess I'm not following, you were asking how to access something installed on Dom0. Did I misunderstand the question?
@scottalanmiller said you could administer the array from a VM as long as it wasn't on the same array. I didn't understand why that would matter. Obviously if you werer going to torch the array, then yes. But why else would it matter?
It matters for when you are NOT going to do it but just going to manage while it is rebuilding.
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Changing the array doesn't required a reboot. You should be able to do that on the fly.
So if you are hitting off a SD or USB you could attach to iDrac and then to the controller software, then manage the array, all while XS is up and running. -
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@BRRABill said in Dell PERC Question (Server Down):
@coliver said
I guess I'm not following, you were asking how to access something installed on Dom0. Did I misunderstand the question?
@scottalanmiller said you could administer the array from a VM as long as it wasn't on the same array. I didn't understand why that would matter. Obviously if you werer going to torch the array, then yes. But why else would it matter?
Because if the array pops you won't be able to access the remote management piece of it. Out-of-band management, like the Dell iDrac, shouldn't be installed on the thing it is managing. This is why the iDrac is a separate machine.
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@Dashrender said
Changing the array doesn't required a reboot. You should be able to do that on the fly.
So if you are hitting off a SD or USB you could attach to iDrac and then to the controller software, then manage the array, all while XS is up and running.The RAID options are very limited from the iDRAC.
Looks like I will need to install OMSA on the XS.
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@BRRABill said in Dell PERC Question (Server Down):
@Dashrender said
Changing the array doesn't required a reboot. You should be able to do that on the fly.
So if you are hitting off a SD or USB you could attach to iDrac and then to the controller software, then manage the array, all while XS is up and running.The RAID options are very limited from the iDRAC.
Looks like I will need to install OMSA on the XS.
Limited, sure. But limited beyond what you really need to do?
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@Dashrender said
Limited, sure. But limited beyond what you really need to do?
It's hard to say at this point.
Most of what I have had to do is deal with foreign config on the array/disk, but ONLY after a cold boot. So, it's never been something I could look into.
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@BRRABill said in Dell PERC Question (Server Down):
Got it.
So we're really just trying to avoid rebooting.
Exactly, because if the server is still functional in any way (rebuilding) then rebooting puts the data at risk.
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Once you move to booting not off the array, you should have to cold boot much amnymore, unless the drives require it to come back online
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@scottalanmiller said in Dell PERC Question (Server Down):
@BRRABill said in Dell PERC Question (Server Down):
Got it.
So we're really just trying to avoid rebooting.
Exactly, because if the server is still functional in any way (rebuilding) then rebooting puts the data at risk.
Thanks, so I wasn't crazy for saying that last night.
