https://community.netapp.com/t5/ONTAP-Discussions/High-disk-utilization-on-NetApp-self-encrypting-disks-using-snapmirror/m-p/105645#M21669 <P>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 due to deswizzling process. Both snapmirror source and destination storage has self-encrypting disks. &nbsp;The CPU &nbsp;usage is low (&lt; 30%) and Memeory usage is also low. Due to business requirements, we have aggressive snapmirror schedule (every 15 minutes) and the updates between the schedule are low ( &gt; 500MB).&nbsp;</P><P>&nbsp;</P><P>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 drives.</P><P>&nbsp;</P><P>So my question is does NetApp self-encrypting disks increases disk background scanning process due to encryption as it may not be updating few changed blocks after snapmirror update process, but entire blocks due to encryption.&nbsp;</P> Thu, 05 Jun 2025 04:12:42 GMT Ben_Rockwood 2025-06-05T04:12:42Z https://community.netapp.com/t5/ONTAP-Discussions/High-disk-utilization-on-NetApp-self-encrypting-disks-using-snapmirror/m-p/105645#M21669 <P>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 due to deswizzling process. Both snapmirror source and destination storage has self-encrypting disks. &nbsp;The CPU &nbsp;usage is low (&lt; 30%) and Memeory usage is also low. Due to business requirements, we have aggressive snapmirror schedule (every 15 minutes) and the updates between the schedule are low ( &gt; 500MB).&nbsp;</P><P>&nbsp;</P><P>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 drives.</P><P>&nbsp;</P><P>So my question is does NetApp self-encrypting disks increases disk background scanning process due to encryption as it may not be updating few changed blocks after snapmirror update process, but entire blocks due to encryption.&nbsp;</P> Thu, 05 Jun 2025 04:12:42 GMT https://community.netapp.com/t5/ONTAP-Discussions/High-disk-utilization-on-NetApp-self-encrypting-disks-using-snapmirror/m-p/105645#M21669 Ben_Rockwood 2025-06-05T04:12:42Z