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kernels

If I recompile just the Linux kernel, do I have to recompile the whole entire applications/other files in my systems?
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When I run hdparm -tT /dev/sda command under CentOS / RHEL I get the following error on screen:

/dev/sda:
Timing buffered disk reads: 908 MB in 3.00 seconds = 302.39 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device

How do I fix this problem?
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Linux Track NFS Directory / Disk I/O Stats

How do I track NFS (network filesystem) client metrics (disk I/O) on Linux operating system?
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