Home > Storage > PowerScale (Isilon) > Product Documentation > Storage (general) > Dell PowerScale: Common AntiVirus Agent Solution > Scenario 2: Performance of scan on read
In this scenario, the client servers generate read requests against the files which have been generated in Scenario 1. The CAVA strict profile is applied to ensure that scan-on-read is enabled. Regarding the detailed CAVA configuration on PowerScale, see the following profile:
vshen-p21evix-1# isi antivirus cava filters view System
Zone: System
Enabled: Yes
Open-on-fail: Yes
File Extensions: *
File Extension Action: include
Scan If No Extension: No
Exclude Paths: -
Scan-profile: strict
Scan-on-read: Yes
Scan-on-close: Yes
Scan-on-rename: Yes
Scan Cloudpool Files: No
Figure 11 illustrates how the number of files scanned per second changes along with the increase of the average file size. With the increased size of the files, the overall trend of the files scanned per second is decreased.
Figure 12 shows the relationship between the average file size and scanning throughput. Theoretically, the results equal the files scanned per second times the average file size in each category. With the increase of file size, the scanning throughput increases. In this case, after it reaches 300 MB/sec, it goes flat. Compared with the results in Scenario 1, it is obvious that the scan efficiency is much lower with scan on read. Scan-on-read can provide better protection against viruses, however, the scanning efficiency is lower than scan-on-close. We recommend carefully selecting the scan profile to match your business requirements and performance level.
The average CPU utilization on a PowerScale cluster is stable around 6% no matter the overall scan throughput or various average file size. For more details, see Figure 13.