Time for another parity disk?


Struck

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Hello.

I have used an unraid server for 3 years now, and I have been upgrading it ever so slowly.

And now the time has come to add a few new harddrives.

 

My current setup:

Quote

 

Unraid 6.8.3 - License Unraid OS Plus

Intel Xeon E5-2680V4

64GB quad channel memory

4x WD Red 8TB (EFZX)

One 1TB Samsung 850 EVO SSD

One 300GB Intel SSD (+1 spare)

2x WD Red 4TB (EFRX)

 

 

The new disks are:

2x WD Red 8TB (EFAX) which is a CMR drive like the others.

 

Current Configuration:

Quote

One 8TB as parity (27k hours, 3000 start/stop)

3x 8TB in the array (non encrypted) (27k hours, 6000-10000 start/stop)

One 1TB 850 EVO as Cache (encrypted)

Two 4TB disks as unassigned disks (36k hours, 7000 start/stop)

One 300GB SSD as unassigned disk.


My array is 20.8/24TB full

 

My Question:

Do you think it is time for me to add a second parity drive to my array, or should i simply add the disks to the array, and upgrade with anohter parity later ?

What would you do?

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9 minutes ago, Struck said:

My Question:

Do you think it is time for me to add a second parity drive to my array, or should i simply add the disks to the array, and upgrade with anohter parity later ?

What would you do?

There is no hard and fast rule for when to add a second parity disk; however, many times the recommendation is to add a second parity disk when you have eight (8) or more data disks to protect. 

 

The fewer data disks the lower the possibility that two will fail simultaneously,  With a greater number of data disks, that risk increases and you decide where that threshold is for you.

 

In your case,  I would still feel comfortable with one parity disk, especially If you have good backups of the important data.   However, it does come down to your risk tolerance and comfort level. 

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