sar is a tool for collecting, reporting, or storing system activity information.

Statistics

Paging

Here are descriptions for paging fields:

Field	Description
pgpgin/s	The total number of bytes that the system has paged in from the disk per second.
pgpgout/s	The total number of bytes that the system has paged out to the disk per second.
fault/s	The number of page-missing failures (major and minor faults) per second caused by the system.
majflt/s	The number of major faults per second caused by the system.
pgfree/s	The number of pages that the system stores in the idle list per second.
pgscank/s	The number of pages scanned per second by the kswapd daemon.
pgscand/s	The number of pages scanned directly per second.
pgsteal/s	The number of pages that the system reclaims per second from the page cache and the swap cache.
%vmeff	The formula for this percentage is pgsteal divided by pgscan, which represents the efficiency of page reclaim.

Here are some options for sar command:

Option	Description
-B	Report paging statistics.
-b	Report I/O ad transfer rate statistics.
-d	Report block device activity statistics.
-H	Report hugepage utilization statistics.
-n {keywork [,…] \| ALL}	Report network statistics, available keyworkds are: DEV, EDEV, NFS, NFSD, SOCK.
-q	Report queue length and load average.
-r	Report memory utilization statistics.
-S	Report swap space utilization statistics.
-u [ALL]	Report CPU utilization. the ALL keyword displays all CPU fields.
-v	Report inode, file and kernal tables status.
-W	Report swapping statistics.
-w	Report task creation and system switching activity

Before we start using it, we need to install it:

                    
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                          yum install sysstat -y

References SAR(1)