Synology SA3400 Virtual Machine Manager s White Paper - Page 25

Comparing Configurations Below we present comparisons of different physical and virtual hardware configurations to help you assess the feasibility of your virtualization setup. The data provided here supplement the general performance statistics we provide for our hardware products on our performance pages. Storage Controller Throughput Performance A comparison of virtual drive controllers using the Synology DS3617xs shows a moderate performance gain when using SATA over IDE drivers. Meanwhile, using VirtIO SCSI drivers more than doubles performance as measured by speed of data throughput. Throughput performance (megabytes per second) DS3617xs VirtI/O SATA IDE Read 1,270.77 486.73 361.39 Write 1,168.73 456.82 428.48 Comparing Configurations CPU Compatibility Mode To illustrate the significant difference in general system performance between setups with CPU Compatibility Mode enabled and disabled, we measured the speed of AES-256 cryptography operations on the all-flash Synology FS3017 and the DS1817+, which has slower I/O performance. We also tested an operation less affected by CPU Compatibility Mode. The AES-256 cryptography figures represent the mean of encryption and decryption speeds. They show a marked decrease in performance to less than one-third the speed on the DS1817+ and almost one-fifth the performance on the faster FS3017. The penalty is more pronounced on the higher-spec model with more hardware support for encryption. 23