Pegasus2 R4 raid5, new physical drive not appearing in list of physical drives

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Bruce Allen posted this 21 August 2019

I recently replaced drive 2 in a Pegasus 2 R4 Raid 5 with a new drive identical to the original.  I am not able to rebuild the logical drive as the new drive does not appear in the physical drives list.  The contents of this RAID are no longer critical as I was able to transfer all data to a new Pegasus 3 R4 Raid 10 before trying to replace the non functioning drive.  Any suggestions?

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Ranjith kumar posted this 22 August 2019

Hi Bruce,

-Have you checked with another new drive, because drive must list under Physical drive tab of Promise utility if it's good drive.

- What is the light status of new drive?

You can also use below compatability list to verify the drives for Pegasus2:

Kindly reach us through by quick response.

Thank you,




Bruce Allen posted this 22 August 2019

Hello Ranjith,

Unfortunately, I only ordered one drive - to replace the defective one.  The new drive is a TOshiba DT01ACA200 (2Tb) exactly as was the 4 original drives in the RAID.  With respect to the light status - I get a single blue light over that drive - not the2 blue lights one normally sees.  The light in the on-off button was also blue.  But, the App does not see the drive - whether all 4 drives are in ... or I unseat drives 1, 3, and 4 (the new drive is in slot 2).

Simon Deighton posted this 2 days ago

Hi Bruce did you ever get a resolution to this?

I am at a client's who I think has the same issue - disk array and logical drive are set to critical. No red lights on any of the physical drives but on one drive only one light (the Drive Staus Light according to the manual) is lit. The Drive Activity Light is off. This drive is not showing up in the Physical Drive List at all (i.e. IDs 2 through 8 are present but no ID 1). They had a drive replaced quite a while ago but I'm not sure if it's that one. The worry of course is that I think this means that there is no Raid redundancy at the moment so one of the other drives going would mean loss of everything on the drive

Bruce Allen posted this yesterday

Hello Simon

I was not able to resolve this problem. It may be related to the formatting (or lack thereof) of the replacement drive.  Unfortunately, I have no way to verify this.  In my case, I had ordered a new RAID and was able to move all the files from the non-functional RAID onto the new RAID.  I did this before trying to replace the faulty drive (as it took weeks to receive a new drive but only days to recieve a whole new RAID system).