On 10/7/19 11:57 am, Reindl Harald wrote:
Am 10.07.19 um 03:28 schrieb Adam Goryachev:
PS, unless you were referring to 3 disk RAID10 as a joke?
exactly
TBH, I really don't understand RAID10, other than improving performance.
For example, in a 10 drive RAID10, you have a higher probability to lose
2 drives that are a "pair" than losing 3 drives in total from a 7 drive
RAID6 (both events lead to total data loss, although potentially you
could recover more "usable" data from the RAID10 array since you would
more likely have a large amount of contiguous data).
RAID10 is about performance *and* redundancy *as well* as storage size
as said: 3 disk RAID10 is a joke and a 3 disk RAID1 is waste of size
3x2 TB RAID1 = 2 TB useable
4x2 TB RAID10 = 4 TB useable
So for the cost of an extra 2TB drive, you got:
1) An extra 2TB capacity - which the OP doesn't need
2) Less data protection, you can only lose a MAXIMUM of 2 disks without
losing data, but if you lose the "wrong" 2 disks, then you lost all your
data.
Using 4 x 2TB RAID1 (ie, same cost/number of disks) would mean you can
lose any 3 disks with no data loss, and when you replace them, quick and
simple recovery process. Even 3 x 2TB allows for ANY 2 disk failure
without data loss.
The OP stated that performance and capacity was not something that
interests him. The primary concern was avoiding the loss of data,
presumably due to drive failure, perhaps availability is also important.
2TB is sufficient for 5 years.
Regards,
Adam
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Adam Goryachev Website Managers www.websitemanagers.com.au
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