Partition Becoing Read Only

Hello everyone,

  I am in real trouble. My NAS box configured for RAID 10 is showing loaded in Read only mode. There are 4 hdd of 1 TB each

Getting following error in syslog

Error Seen: (in NAS logs)
BTRFS error (device sda): parent transid verify failed on 8928541016064 wanted 83980 found 82650

The partition is 75% full.

Should I scrub it to fix it. How much time will it take.

Any pointers ?