Virtual disk one with only one member disk will be a RAID 0.
If your disks are all the same size, your O/S will see two drives, both the same size, the first drive will be the virtual disk 0 and is redundant, the second disk will be virtual disk 1 and is NOT redundant. The O/S will not be able to see any differences in the two drives.
If I take out one of my disk from Virtual Disk 0, the server will be okay then. ?
If I then put it back into server how does the Raid Controller know which disk to rebuild from. e.g. the disk in the server or the disk I am just about to put back in ?
The RAID controller has marked the removed drive as missing, when it detects the missing drive has been reinstalled, it will rebuild from the drive that was not missing. The assumption is that the drive that stayed home has more current info that the one that has been wandering far afield.
Yes if a single drive is removed from a redundant array the array will indeed continue to be available to the operating system. There are a few details such as disabling the write cache that may affect performance while the array is degraded, but generally you will not notice any thing unless you have the audible alarm enabled on your controller or you have a management utility set to email you , or that you check the system logs.
DELL-GaryS
777 Posts
0
April 12th, 2006 09:00
Hi Martin,
Virtual disk zero RAID 1 is a mirror.
Virtual disk one with only one member disk will be a RAID 0.
If your disks are all the same size, your O/S will see two drives, both the same size, the first drive will be the virtual disk 0 and is redundant, the second disk will be virtual disk 1 and is NOT redundant. The O/S will not be able to see any differences in the two drives.
I hope this helps you.
MartinfaeScotla
6 Posts
0
April 12th, 2006 20:00
Thanks very much, makes sense now !
If I take out one of my disk from Virtual Disk 0, the server will be okay then. ?
If I then put it back into server how does the Raid Controller know which disk to rebuild from. e.g. the disk in the server or the disk I am just about to put back in ?
Thanks,
Martin
DELL-GaryS
777 Posts
0
April 13th, 2006 10:00
Hi Martinfaescotland,
The RAID controller has marked the removed drive as missing, when it detects the missing drive has been reinstalled, it will rebuild from the drive that was not missing. The assumption is that the drive that stayed home has more current info that the one that has been wandering far afield.
Yes if a single drive is removed from a redundant array the array will indeed continue to be available to the operating system. There are a few details such as disabling the write cache that may affect performance while the array is degraded, but generally you will not notice any thing unless you have the audible alarm enabled on your controller or you have a management utility set to email you , or that you check the system logs.