Help! Restore Pegasus2 R8

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  • Last Post 15 December 2022
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Tim Kemple posted this 12 December 2022

Hello. We mistakenly deleted the logical drive of our Pegasus2 R8 within the Pegasus Utility. The physical drives are untouched, and the array is still active/untouched. Is there a simple way to restore the logical drive that was setup in RAID 5?  

Thanks!

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Babatunde Akinkuolie posted this 13 December 2022

Unfortunately, when you delete a logical drive,  all the data on the logical is lost and cannot be restored. it is always advisable to back up any important data before situation like this arises.

Tim Kemple posted this 13 December 2022

Thanks! Forgive me but I have a modest amount of knowledge with backup systems and know that 'all data is lost' is a blanket statement that might not be entirely accurate. My question was, is there a an easy way to retore the RAID (using terminal/CLI or simlar)?  It sounds like perhaps no?

And if its ok... What does the data recovery process look like if we wanted to explore that route?

 

Thanks for your help!!

Babatunde Akinkuolie posted this 13 December 2022

Unfortunately, There is no way to restore the RAID using terminal/CLI. 

 

Tim Kemple posted this 13 December 2022

Thank you for the quick reply!

Is it possible to use third party data recovery? What does that look like?

 

Babatunde Akinkuolie posted this 13 December 2022

You can try to use third party recovery if possible; however you delete a logical drive, all the data on the logical is lost and cannot be restored.. You can refer to data recovery services like Drivesavers Data Recovery for further assistance.

 

 

R P posted this 14 December 2022

Hi Tim,

When a LUN is deleted the data on disk is not touched. The array information is stored in something called DDF at the very end of each array disk. The DDF is all that is deleted (when an array is deleted) or modified (if only the LUN is deleted). If a deleted LUN is re-created, the volume will be restored. Data recovery services are needed primarily when there is a disk failure of a critical disk.

That being said, you need ot know the configuration of the original LUN to recreate it. Many users change the factory default configuration.

And recreating the LUN will have to be done from the terminal.

Were any changed made to the default configuration of your Pegasus?

Tim Kemple posted this 15 December 2022

Hi RP

Thanks for your response!

The Pegasus2 R8 was set up as a RAID5 with the default settings. It was configured on a mac using the promis utility.

The logical cache policy was set to ReadAhead/WriteBack (Not sure if this variable matters?)

Thanks!

R P posted this 15 December 2022

Hi Tim,

If everything is in the default configuration, then the process should be...

1. open a terminal

2. enter 'promiseutil' to start the CLI.

3. To recreate the LUN, use the following command...

array -a addld -d 0 -l "raid=5,forcesynchronized=yes"

4. The Volume should mount on the MAC, verify that your files are present.

5. If no files are present that means the LUN was not successfully recreated, delete the LUN immediately.

Tim Kemple posted this 15 December 2022

Hi RP

That worked perfectly!

THANK YOU

R P posted this 15 December 2022

Hi Tim,

Fantastic.

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