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Can you RAID 2 different size hard drives?
It can be done, however the raid size is restricted to the smallest drive in the array. It’s generally frowned upon to use different drive types, let alone sizes for RAID, but it can be done if you don’t mind sacrificing the extra space on your larger drive to do it.
Can RAID work with different size drives?
You can always mix drive sizes in RAID. And in plain RAID you always get the smallest common size from all drives. So in your case, each drive use 4TB. If you added one 1TB drive, all the drives would act as 1TB drives.
Do all drives in a RAID array have to be the same size?
The only absolute requirement for matching drive specs in a RAID 10 array is that the drives must be of the same architecture, e.g., all SAS or SATA.
Do NAS hard drives have to be the same size?
Some NAS units absolutely require drives to be identically sized. If it is only capable of presenting one Volume to the network, this is good because dissimilar drives create wasted space. More advanced NAS units can present multiple Volumes, so you can deal with have sets of differently sized drives.
Can you RAID 0 Two SSDS?
If you have this SSD RAID 0 array as a secondary drive…a target for that scratch space…then yes, it can be quite beneficial.
Can you RAID 10 with different size drives?
You can however use the excess space in another array, if the excess space is the same size or larger as the additional array. So in short, yes, you are correct: Only half the space on the 2TB disks will be used.
Can I mix HDD in a NAS?
If you are not creating RAID but have two separate volumes for each drive, then you can benefit from maximums speed from the black drive or pro drive. But yes, you can mix drives.
Why is there no redundancy in mdadm raid?
Adding a new drive could move the device names around and, relying on “raidtab”, when the array was assembled it could get the wrong drives in the wrong place. Only linear and raid-0 were supported at this time, so there was no redundancy to recover from. mdadm still supports this sort of array with the –build option.
How big does mdadm version 1.0 need to be?
Version 1.0 will leave 128K at the end of each device if it is large enough – “large enough” being defined as 200GB. mdadm is unable to move the superblock, so there is no way of converting between the different version 1s. There are also two other superblock formats, ddf and imsm.
How often does mdadm need to be run?
Every time the system is booted, this needs to run. It scans the drives, looking for superblocks, and rebuilds all the arrays for you.
Which is the default mode in mdadm Linux?
A bit of a misnomer, this mode takes care of all operations that change the size of an array, such as changing the raid level, changing the number of active devices, etc. This is the default mode, and is used primarily to add and remove devices.