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Question-replacing failed disk with lower capacity in VA7100

Mahadev Pednekar
Frequent Advisor

Question-replacing failed disk with lower capacity in VA7100

Hi,
I have one VA7100 with 10 nos of 18 GB disks and 3 nos of 72 GB disks and connected to hpux under HA cluster.
Now one of the 72 GB HDD is failed and from SDM it was found that redundancy level = 43 GB where as witout HDD failure redundancy level was 135 GB. Presently I couldn't procure 72 GB HDD immediately and replace it but I have 36 GB HDD, so my question is can I replace 36 GB HDD with failed 72 GB HDD and will the redundancy can be achieved in both space & spindle level.

regds,
Mahadev
5 REPLIES
Thayanidhi
Honored Contributor

Re: Question-replacing failed disk with lower capacity in VA7100

The replacement should be equal or higher than the original. A lower capacity disk cannot re-distribute the data which were originally there due to lack of space!

I never tried, but I feel it won't work.

Is Array status in warning or Ready?
The LUNS are in AuroRAID or RAID1+1?


Regds
TT
Attitude (not aptitude) determines altitude.
Mahadev Pednekar
Frequent Advisor

Re: Question-replacing failed disk with lower capacity in VA7100

Hi TT,
Thanks for info.
Array status is in warning.
The LUNS are in AuroRAID.
That means it is not advisable to insert lower capacity HDD.

regds,
MP
Thayanidhi
Honored Contributor

Re: Question-replacing failed disk with lower capacity in VA7100

Hi,

Please find attached Disk replacement guide. Its clearly mentioned that the replaced disk should be same or higher size.

Regds
TT
Attitude (not aptitude) determines altitude.
Joshua Scott
Honored Contributor

Re: Question-replacing failed disk with lower capacity in VA7100

THIS IS VERY DANGEROUS! If you replace the failed 73GB Drive with a 36GB, the VA7100 will likely attempt to put the data that was on the 73GB Drive before onto the new 36GB Drive. Once it reaches the end of the drive, the operation will fail, and YOU MAY LOSE ALL THE DATA ON THE ARRAY!

Josh
What are the chances...
Mahadev Pednekar
Frequent Advisor

Re: Question-replacing failed disk with lower capacity in VA7100

Dear All,
Thanks for your valuable information, the 72 GB disk is ordered and will replace once it arrives.

Regards,
MP