The file system /dev/sda1, which is mounted at /boot, has reached warn status because it is 90.33% full.

Once a day I got the below warning.
When I talk with my hosting company they say that "There is nothing to worry. The boot directory has only the OS and it is not possible to write a file there."

Do they right? There is nothing to worry?

The file system /dev/sda1, which is mounted at /boot, has reached warn status because it is 90.33% full.

Server:      xxxx.com
Primary IP:      89.19.23.154
Notification Type:      warn
Filesystem:      /dev/sda1
Mount Point:      /boot
Percentage Full:       90.33%
Disk Information:      
Used: 89.22 MB
Available: 9.54 MB
Total: 98.76 MB
ChkServd Version:      15.8
LVL 1
myyisAsked:
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Jan SpringerCommented:
Sounds like they've done kernel updates but have not removed all but two kernels: one in use and one that is the latest.

I would ask them to please do so.
gheistCommented:
You have RHEL5, which by default used 100MB /boot.
set installonly_limit=2 in /etc/yum.conf and upgrade kernel. all old kernels will go but one running.
future versions use 500MB boot, so for permanent solution i'd recommend to partition with RHEL6 and then install RHEL5 in partitions (AF alignment etc)

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