Users are reporting that a Linux server is responding slowly. A systems administrator troubleshooting the server issue sees the following:
# iostat -m 2
Linux 3.10.0-1160.66.1.el7.x86_64 (myhost) 10/19/2022 x86_64 (4 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
24.30 0.01 0.29 50.38 4.00 19.01
Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sdd 15.65 0.48 0.83 4936250 8513501
# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 64K 16G 1% /dev/shm
/dev/mapper/root 35G 8.8G 26G 26% /
/dev/sda2 497M 144M 354M 29% /boot
/dev/mapper/tmp 10G 38M 10G 1% /tmp
/dev/mapper/var 15G 13G 2.2G 86% /var
/dev/mapper/varlib 650G 397G 254G 62% /var/lib
/dev/mapper/varlog 15G 9.5G 5.5G 64% /var/log
/dev/mapper/varaudit 15G 72M 15G 1% /var/log/audit
Which of the following is most likely the issue?