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jmarket
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Raid 10

Am I correct in saying that it is possable to lose multiple drives in a raid 10 array and not lose data? Say we have 6 drives in raid 10. Row 1 would be stripped and Row 2 is mirroring row 1 below in my example.

Row 1 - Drive 1,2,3

Row 2- Drive 1,2,3

As long as say drive 2 in row 1 fails and drive 3 in either row it would still be working correctly? As long as the same number drive in both rows doesnt fail is that correct?

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badazws6
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Taken from: http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks

RAID 1+0: Mirrored Set + Striped Set (4 disk minimum; Even number of disks) provides fault tolerance and improved performance but increases complexity. Array continues to operate with one failed drive. The key difference from RAID 01 is that RAID 10 creates a striped set from a series of mirrored drives.

So you have mirrored strips. So if you loose one drive you loose one of the striped sets. If you loose a drive in the other striped set you loose your array.

If you want to be able to loose multiple drives look at RAID 50:

RAID 5+0: A stripe across distributed parity RAID systems

Raid 50 is Mirrored raid 5 arrays. You would have to loose 4, two drives out of each side of the mirror to loose your array.

You could also look at Raid 6:

RAID 6: Striped Set (4 disk minimum) with Dual Distributed Parity: Provides fault tolerance from two drive failures; array continues to operate with up to two failed drives. This makes larger RAID groups more practical. This is becoming a popular choice for SATA drives as they approach 1 Terabyte in size. This is because the single parity RAID levels are vulnerable to data loss until the failed drive is rebuilt. The larger the drive, the longer the rebuild will take. With dual parity, it gives the array time to rebuild onto a large drive with the ability to sustain another drive failure.

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badazws6
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Taken from: http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks

RAID 1+0: Mirrored Set + Striped Set (4 disk minimum; Even number of disks) provides fault tolerance and improved performance but increases complexity. Array continues to operate with one failed drive. The key difference from RAID 01 is that RAID 10 creates a striped set from a series of mirrored drives.

So you have mirrored strips. So if you loose one drive you loose one of the striped sets. If you loose a drive in the other striped set you loose your array.

If you want to be able to loose multiple drives look at RAID 50:

RAID 5+0: A stripe across distributed parity RAID systems

Raid 50 is Mirrored raid 5 arrays. You would have to loose 4, two drives out of each side of the mirror to loose your array.

You could also look at Raid 6:

RAID 6: Striped Set (4 disk minimum) with Dual Distributed Parity: Provides fault tolerance from two drive failures; array continues to operate with up to two failed drives. This makes larger RAID groups more practical. This is becoming a popular choice for SATA drives as they approach 1 Terabyte in size. This is because the single parity RAID levels are vulnerable to data loss until the failed drive is rebuilt. The larger the drive, the longer the rebuild will take. With dual parity, it gives the array time to rebuild onto a large drive with the ability to sustain another drive failure.

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jmarket
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Thanks

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