Does NetApp self-encrypting disks increases the background scanning process?
2015-05-28 03:12 PM
Does NetApp self-encrypting disks increases the background scanning process (such as disk deswizzling, block reclamation..etc) due to encryption compared to non-encrypting NetApp disks? We are experience high reads on the disks which has snapmirrored destination volumes s due to deswizzling process. Both snapmirror source and destination storage has self-encrypting disks. The CPU usage is low (< 30%) and Memeory usage is also low. Due to business requirements, we have very aggressive snapmirror schedule (every 15 minutes) and updates between the schedule are low ( > 500MB).
But after every update, we see disk usage will shoot up to 100% and on stait output, we see the 300+ disk iops on 10k rpm disks.
So my question is does NetApp self-encrypting disks increases disk background scanning process due to encryption as it may not updating few changed blocks, but entire blocks due to encryption.