waiting for first write

[Harald_8]

Hello,

Just Creating a new LUN within a Testenvironment. The LUN goes over 4 Disks with RAID 1. -> so far ok

Now i migrated this to raid-level 5
After "show unit 0" command its writes out "waiting for first write".

I'am only attached to the MSA1500CS with MSA30 with a serial Cable.

Thxs for some help

[John Kufrovich]

Well, present the LUN to the OS and put a FS on it. Once any write happens, Parity Init will start.

[Uwe Zessin]

Oh, by the way, John:
can you please ask the engineer(s) why the MSA does not start immediately with the parity construct / initial mirror copy?

I have always disliked that behaviour. With other storage arrays, I set them up first and then walk my way over the server(s). During that time, the storage array can proceed with the initial mirroring/ RAID-5/6 construct.

[John Kufrovich]

Uwe,

It's one of those business product rules we have to adhere to.
The intent was allow individuals to make changes to a LUN before any actual data gets written.

[Harald_8]

Thxs for the answer, But i already know this.
In Some cases it should be possible to check and configure the MSA without any Server.
Because we get the Hardware first and want to configure and test it, before shipping in to our customers.

[John Kufrovich]

Harald,
You can configure the Array with the cli cable.
The LUN is still useable if you decide to test it with a server. Once any write occurs, PI will start.