raid disk showing under specialized and network disks

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pradeep8985
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raid disk showing under specialized and network disks

Post by pradeep8985 » 2020/07/24 21:16:48

Hello All,

I have a supermicro server and i am trying to install the centos OS on that server. I have configured raid 1 on the OS disks, however i could not see the disk under local disks but its showing up under specialized and network disks.. wondering what is that i am doing wrong. Pls help.

Screenshot attached.
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TrevorH
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Re: raid disk showing under specialized and network disks

Post by TrevorH » 2020/07/24 21:42:12

Most likely you are trying to use a built-in FakeRAID on the motherboard. It's very rare for motherboards to have real hardware RAID controllers on them and hte FakeRAID that the chipset does is all offloaded to your cpu and expects closed source Windows drivers to run them. There are linux versions too but the usual advice is to disable the FakeRAID and turn on AHCI mode then, if you need RAID, use linux software RAID.

Supermicro may be the one exception to that motherboard-RAID is FakeRAID rule but you'd have to flip to a command prompt (Alt-Ctrl-F2 once the installer has started) and run lspci -nn | grep -i raid and post the resulting output here to know for sure.
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pradeep8985
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Re: raid disk showing under specialized and network disks

Post by pradeep8985 » 2020/07/24 22:40:41

TrevorH wrote:
2020/07/24 21:42:12
Most likely you are trying to use a built-in FakeRAID on the motherboard. It's very rare for motherboards to have real hardware RAID controllers on them and hte FakeRAID that the chipset does is all offloaded to your cpu and expects closed source Windows drivers to run them. There are linux versions too but the usual advice is to disable the FakeRAID and turn on AHCI mode then, if you need RAID, use linux software RAID.

Supermicro may be the one exception to that motherboard-RAID is FakeRAID rule but you'd have to flip to a command prompt (Alt-Ctrl-F2 once the installer has started) and run lspci -nn | grep -i raid and post the resulting output here to know for sure.

Hi Trevor,

Here is the screenshot of the output attached.

I have installed and configured in multiple servers so far i have not seen this kind...Is it safe to install the OS on this type of raid disk. really skeptical to use although as i am speaking i installed the OS on this raid disk and it came up. Pls suggest
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Last edited by pradeep8985 on 2020/07/24 22:59:31, edited 1 time in total.

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TrevorH
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Re: raid disk showing under specialized and network disks

Post by TrevorH » 2020/07/24 22:59:17

So the top two there in your list, the Intel ones, those would be FakeRAID. The other two are not, those are real hardware RAID controllers so if your disks are attached to those - and if not, why not! - then those ought to be detected and work correctly as an array, presenting all disks in that array as a single device - for example /dev/sda.

I'd suggest that you run dmesg | less and read your way through from top to bottom and see what the kernel detects at boot time and what it says about them. I've just checked one of my Dell servers and their H730 RAID controller is the same one reported on your system. For that, I see a lot of output from dmesg | grep -i mega.
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pradeep8985
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Re: raid disk showing under specialized and network disks

Post by pradeep8985 » 2020/07/24 23:51:08

HI Trevor,

I did check further in my bios setup if there is anyway to setup raid controller other than the fakeid one's. I am not seeing any option there unlike some of the pics in the internet shows megaraid utilities configuration in the Advanced option. I am creating raid from the ctrl R option seen on the boot time which i presume is similar to the one from the BIOS setup. let me know your thoughts on this.
i have to go through the logs and will feedback here.
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TrevorH
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Re: raid disk showing under specialized and network disks

Post by TrevorH » 2020/07/25 11:46:19

I am creating raid from the ctrl R option seen on the boot time
But your screenshot is not of that utility is it?
CentOS 6 will die in November 2020 - migrate sooner rather than later!
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pradeep8985
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Re: raid disk showing under specialized and network disks

Post by pradeep8985 » 2020/07/27 05:13:13

TrevorH wrote:
2020/07/25 11:46:19
I am creating raid from the ctrl R option seen on the boot time
But your screenshot is not of that utility is it?
No.. its the same utility.. When i am pressing ctlr R.. iam getting this utility posted earlier.

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