The sar command can provide detailed system metrics on just about every aspect of system performance. You can query it on as as-needed basis or set it up to provide daily reports. Sar is a system ...

I used Linux OS (Red Hat 7.1) when my computer accidentally lost power. So I reboot my computer. When the Linux was booting it 'checking file system' and I saw the 'Failed message' . It asked me for ...