how to identify if raid1 or raid mirror configure on OS disk
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we want to verify if raid1 is configured on out linux machine
so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1
but from the output - how we can be sure that raid1 is configured?
and how to understand it from the command: dmesg | grep raid
when non raid , and when raid1 is configured ?
linux raid disk dmesg raid1
asked Dec 7 '17 at 14:25
yael
2,0231145
add a comment |Â
up vote
-1
down vote
favorite
we want to verify if raid1 is configured on out linux machine
so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1
but from the output - how we can be sure that raid1 is configured?
and how to understand it from the command: dmesg | grep raid
when non raid , and when raid1 is configured ?
linux raid disk dmesg raid1
asked Dec 7 '17 at 14:25
yael
2,0231145
Possible duplicate of linux + tool that can identify RAID configuration
– peterh
Dec 9 '17 at 19:22
add a comment |Â
up vote
-1
down vote
favorite
up vote
-1
down vote
favorite
we want to verify if raid1 is configured on out linux machine
so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1
but from the output - how we can be sure that raid1 is configured?
and how to understand it from the command: dmesg | grep raid
when non raid , and when raid1 is configured ?
linux raid disk dmesg raid1
asked Dec 7 '17 at 14:25
yael
2,0231145
we want to verify if raid1 is configured on out linux machine
so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1
but from the output - how we can be sure that raid1 is configured?
and how to understand it from the command: dmesg | grep raid
when non raid , and when raid1 is configured ?
linux raid disk dmesg raid1
asked Dec 7 '17 at 14:25
yael
2,0231145
asked Dec 7 '17 at 14:25
yael
2,0231145
asked Dec 7 '17 at 14:25
yael
2,0231145
asked Dec 7 '17 at 14:25
yael
2,0231145
2,0231145
Possible duplicate of linux + tool that can identify RAID configuration
– peterh
Dec 9 '17 at 19:22
add a comment |Â
Possible duplicate of linux + tool that can identify RAID configuration
– peterh
Dec 9 '17 at 19:22
Possible duplicate of linux + tool that can identify RAID configuration
– peterh
Dec 9 '17 at 19:22
Possible duplicate of linux + tool that can identify RAID configuration
– peterh
Dec 9 '17 at 19:22
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
1
down vote
accepted
The output in the image you attached isn't necessarily showing you what you think it is. The "megaraid_sas" bits aren't specifying any RAID level in the OS, they're specifying the use of the "megaraid_sas" driver to access the disk. Given that, you are very likely using a MegaRAID controller, which is capable of various RAID levels, but to see the configuration you would need to be in the MegaRAID BIOS screen. That information usually isn't available from the OS. When configured for RAID-1, the MegaRAID card will hide the two physical disks from the system, and will present the kernel and OS with only a single disk device.
In short: check your MegaRAID BIOS configuration.
answered Dec 7 '17 at 14:33
John
11.3k11630
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
accepted
The output in the image you attached isn't necessarily showing you what you think it is. The "megaraid_sas" bits aren't specifying any RAID level in the OS, they're specifying the use of the "megaraid_sas" driver to access the disk. Given that, you are very likely using a MegaRAID controller, which is capable of various RAID levels, but to see the configuration you would need to be in the MegaRAID BIOS screen. That information usually isn't available from the OS. When configured for RAID-1, the MegaRAID card will hide the two physical disks from the system, and will present the kernel and OS with only a single disk device.
In short: check your MegaRAID BIOS configuration.
answered Dec 7 '17 at 14:33
John
11.3k11630
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
add a comment |Â
up vote
1
down vote
accepted
The output in the image you attached isn't necessarily showing you what you think it is. The "megaraid_sas" bits aren't specifying any RAID level in the OS, they're specifying the use of the "megaraid_sas" driver to access the disk. Given that, you are very likely using a MegaRAID controller, which is capable of various RAID levels, but to see the configuration you would need to be in the MegaRAID BIOS screen. That information usually isn't available from the OS. When configured for RAID-1, the MegaRAID card will hide the two physical disks from the system, and will present the kernel and OS with only a single disk device.
In short: check your MegaRAID BIOS configuration.
answered Dec 7 '17 at 14:33
John
11.3k11630
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
add a comment |Â
up vote
1
down vote
accepted
up vote
1
down vote
accepted
The output in the image you attached isn't necessarily showing you what you think it is. The "megaraid_sas" bits aren't specifying any RAID level in the OS, they're specifying the use of the "megaraid_sas" driver to access the disk. Given that, you are very likely using a MegaRAID controller, which is capable of various RAID levels, but to see the configuration you would need to be in the MegaRAID BIOS screen. That information usually isn't available from the OS. When configured for RAID-1, the MegaRAID card will hide the two physical disks from the system, and will present the kernel and OS with only a single disk device.
In short: check your MegaRAID BIOS configuration.
answered Dec 7 '17 at 14:33
John
11.3k11630
The output in the image you attached isn't necessarily showing you what you think it is. The "megaraid_sas" bits aren't specifying any RAID level in the OS, they're specifying the use of the "megaraid_sas" driver to access the disk. Given that, you are very likely using a MegaRAID controller, which is capable of various RAID levels, but to see the configuration you would need to be in the MegaRAID BIOS screen. That information usually isn't available from the OS. When configured for RAID-1, the MegaRAID card will hide the two physical disks from the system, and will present the kernel and OS with only a single disk device.
In short: check your MegaRAID BIOS configuration.
answered Dec 7 '17 at 14:33
John
11.3k11630
answered Dec 7 '17 at 14:33
John
11.3k11630
answered Dec 7 '17 at 14:33
John
11.3k11630
answered Dec 7 '17 at 14:33
John
11.3k11630
11.3k11630
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
add a comment |Â
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
MegaRAID BIOS configuration. is relevant for each HW? ( because some server are dell and some others etc )
– yael
Dec 7 '17 at 14:40
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
This answer is only relevant for systems which have and use a MegaRAID controller card. Other systems with other RAID controllers will have a different driver in use and a different BIOS to check.
– John
Dec 7 '17 at 15:16
add a comment |Â
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Possible duplicate of linux + tool that can identify RAID configuration
– peterh
Dec 9 '17 at 19:22