https://community.netapp.com/t5/ONTAP-Hardware/Disk-Spare-Ratio-Question/m-p/434781#M11214 <P>Hi Team,</P><P>Do we have a formula to calculate spare ratio per number of disks in the node for SATA or SAS disks</P><P>I found some KB for SSD .I'm looking for the same for SATA or SAS disks.</P><P><U><STRONG>Example KB for ADP</STRONG></U></P><P>number of spare per number of disks per node.</P><P><A href="https://mysupport.netapp.com/site/article?lang=en&amp;page=%2FAdvice_and_Troubleshooting%2FData_Storage_Software%2FONTAP_OS%2FWhat_are_the_rules_for_Advanced_Disk_Partitioning&amp;type=question" target="_blank">https://mysupport.netapp.com/site/article?lang=en&amp;page=%2FAdvice_and_Troubleshooting%2FData_Storage_Software%2FONTAP_OS%2FWhat_are_the_rules_for_Advanced_Disk_Partitioning&amp;type=question</A>&nbsp;</P><P>&nbsp;</P> Wed, 04 Jun 2025 10:01:26 GMT Wazan 2025-06-04T10:01:26Z https://community.netapp.com/t5/ONTAP-Hardware/Disk-Spare-Ratio-Question/m-p/434781#M11214 <P>Hi Team,</P><P>Do we have a formula to calculate spare ratio per number of disks in the node for SATA or SAS disks</P><P>I found some KB for SSD .I'm looking for the same for SATA or SAS disks.</P><P><U><STRONG>Example KB for ADP</STRONG></U></P><P>number of spare per number of disks per node.</P><P><A href="https://mysupport.netapp.com/site/article?lang=en&amp;page=%2FAdvice_and_Troubleshooting%2FData_Storage_Software%2FONTAP_OS%2FWhat_are_the_rules_for_Advanced_Disk_Partitioning&amp;type=question" target="_blank">https://mysupport.netapp.com/site/article?lang=en&amp;page=%2FAdvice_and_Troubleshooting%2FData_Storage_Software%2FONTAP_OS%2FWhat_are_the_rules_for_Advanced_Disk_Partitioning&amp;type=question</A>&nbsp;</P><P>&nbsp;</P> Wed, 04 Jun 2025 10:01:26 GMT https://community.netapp.com/t5/ONTAP-Hardware/Disk-Spare-Ratio-Question/m-p/434781#M11214 Wazan 2025-06-04T10:01:26Z https://community.netapp.com/t5/ONTAP-Hardware/Disk-Spare-Ratio-Question/m-p/434791#M11216 <P>Actually, if you review the KB, it applies to both HDD and SSD. The commonality is disk partitioning, which pretty well the default for most systems.</P> Fri, 06 May 2022 18:08:26 GMT https://community.netapp.com/t5/ONTAP-Hardware/Disk-Spare-Ratio-Question/m-p/434791#M11216 andris 2022-05-06T18:08:26Z