New member with first question

[cracksilver]

Hi all

 

I'm from Switzerland and turned over from Synology to unRaid on HP gen8.

 

Everything works fine. Just asking me about the order of my plates. I got 2 x 3TB as parity and 2 x 1TB for array. One SSD cache plate with 128 GB is also in use. This arragement gives me 3 TB. Are there other orders for better performance or space known.

 

Thx.

Cracksilver

 

 

 

Gesendet von meinem ONEPLUS A5000 mit Tapatalk

 

 

[trurl]

2x1TB data means you only have 2TB storage, not 3. There is probably little point in having dual parity with so few disks so you might make one of those another data disk.

[cracksilver]

hi Construcor

thx for answering.

 

Ok, if I do so... One of the 3TB parity disk change to data disk, how to do? Just take out, delete and add to the array?

 

cracksilver

[trurl]

51 minutes ago, cracksilver said:

hi Construcor

Hi "Newbie"😉 (I know "Newbie" isn't your username but mine isn't "Constructor" either)

 

Before continuing, I have to wonder why you are using such small disks? Are these old disks? Are you sure they are in good health?

 

52 minutes ago, cracksilver said:

One of the 3TB parity disk change to data disk, how to do?

I haven't needed to do your exact scenario, but I think it should work something like this. Maybe someone else will respond with more details, or you can just ask more questions as you go.

 

Tools - New Config, Retain All. Reassign parity2 as data. Check the box saying parity is valid then start the array to clear and then format the new data disk.

 

[cracksilver]

sorry "constructor", just saw that's the state of your membership..... but sounds good anyway 

 

thx for input.

 

What are you thinking about this order?

 

parity 1 = 3TB

parity 2 = 1TB

disk 1 = 3TB

disk 1 = 1 TB

 

cracksilver

 

 

[JorgeB]

Parity disks can't be smaller than any data disk.

[cracksilver]

1 minute ago, johnnie.black said:

Parity disks can't be smaller than any data disk.

no parity disk is smaller than the data disks. They are exactly the same size, brand etc...

 

but you think this order would not be ok?

[JorgeB]

6 minutes ago, cracksilver said:

parity 2 = 1TB

This is smaller than disk1

[cracksilver]

Just now, johnnie.black said:

This is smaller than disk1

Ok thats the way...

 

Then there are two orders with this 4 disks:

 

parity 1 = 3TB

parity 2 = 3TB

disk 1 = 1TB

disk 2 = 1TB

Total for use = 2TB

 

or this:

 

parity 1 = 3TB

parity 2 = no

disk 1 = 3TB

disk 2 = 1TB

disk 3 = 1TB

Total for use = 3TB

 

is it right?

 

[JorgeB]

Just now, cracksilver said:

is it right?

Almost, total usable on the last option would be 5TB

[cracksilver]

Just now, johnnie.black said:

Almost, total usable on the last option would be 5TB

ok. but no rendundancy of the parity disk?

[JorgeB]

With redundancy, single parity can protect all the data disks against one failed disk, two failed disks with double parity, size of the data disks doesn't matter, they just cant be larger than any of the parity disks.

[cracksilver]

ok. then i stay at the moment with the one I have... as soon as I need more space, I change the parity 2 to Disk 3.

 

thx for helping a newbie

[trurl]

Parity isn't a backup of any of your data. It simply allows the data for a missing disk to be calculated from parity PLUS ALL the other disks. This is why I asked about the health of your small disks. ALL disks must be healthy for parity to work as designed.

 

Here is a wiki about how parity works:

 

https://wiki.unraid.net/UnRAID_6/Overview#Parity-Protected_Array

 

In addition to parity you need to have a backup plan for any important and irreplaceable data.

 

 

[cracksilver]

1 hour ago, trurl said:

Parity isn't a backup of any of your data. It simply allows the data for a missing disk to be calculated from parity PLUS ALL the other disks. This is why I asked about the health of your small disks. ALL disks must be healthy for parity to work as designed.

 

Here is a wiki about how parity works:

 

https://wiki.unraid.net/UnRAID_6/Overview#Parity-Protected_Array

 

In addition to parity you need to have a backup plan for any important and irreplaceable data.

 

 

Thanks for that. I read it allready yesterday. I just wasn't shure about the order of the disk. But now I think it works for me a while. I just have data about 1 TB at the moment.

 

And yes I know, parity is NOT A BACKUP. For backup I have other solutions. Unraid is just the datapool and virtualization server for some things. And dockers works realy like a charm in unRaid

 

thx, bye