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Add/Remove HDD from Raid5 array with UCS C220-M3

Brad Martin
Level 3
Level 3

‎04-30-2014 08:03 AM - edited ‎03-01-2019 11:38 AM

I have two UCS C220-M3 stand alone servers each with 4 500GB drives configured with raid5. Can I remove one HDD from one server and add to the other without rebuilding ESXi host and guests?

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Manuel Velasco
Cisco Employee
Cisco Employee

‎04-30-2014 03:23 PM

Hi bmartin

Any RAID 5 configuration will allow to lose one drive.  If you lose more then one you will lose all of the data.   In your case if you remove one of the driver you will not lose the data, but if anything happens to any of the other drives the data on that server is going to be gone.

 

A RAID 5 comprises block-level striping with distributed parity. Unlike in RAID 4, parity information is distributed among the drives. It requires that all drives but one be present to operate. Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost. RAID 5 requires at least three disks.

http://www.cyberciti.biz/faq/what-happens-when-hard-disk-fails-in-raid-5/

 

Please let me know if this helps.

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