One PBS with raid1 or two with single discs?
- Thread starter bomart
- Start date
Two independent PBS' with two disks each ;-)
In this specific case, without any other option: there are multiple elements in a system that may die - starting from the power supply over the CPU and chipset to RAM. The disk is just one element.
With this in my mind: I would expect option 2) to be more reliable on the long run...
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I also like the idea of two servers versus one if forced to pick, but also with the added arrangement that the servers are geographically separated.
What are you protecting against? Do you back up or replicate the data from PBS already? My instance of PBS does run on RAID 1, but I also backup my PBS datastore to my Synology, a NUC, and to the cloud. I would have no problem having PBS on a single disk on a single server if there are a sufficient number of copies of the data.
To be clear, this is more of a thought experiment so in the real world you do really want disk redundancy as well even in this two-server scenario. Sure, the odds are low that both will fail during the same time frame causing data loss, but there are situations that happen in the real world. For example, read errors on the hard drive of the second server during a restore, or just an outright disk failure due to the continuous restore load.
Ultimately, all the other server components could be eventually replaced, but the one thing that has your data can't.
Ultimately, all the other server components could be eventually replaced, but the one thing that has your data can't.
I think the answer really depends on the risk being mitigated. I would go two servers if PBS needs to be nearly highly available. Neither solution is the answer for data durability. As has often been mentioned, RAID is not a backup. Neither is two servers in my opinion. You need a proper 3/2/1 back up if data durability is the concern.