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Appendix A File System
A.1 Read-Only vs. Read-Write
You may choose to interact directly with the SCS’s file system, in which case, you must mount it for read-write access before your changes will be saved to the system’s Compact Flash memory device. It is not necessary to do this, to use the SCS.
Caution
Regular SCS use does not require changes to Read-Write operation. An experienced sysadmin may only need to use this if they need to interact with the SCS’s Linux file system directly. Do not leave the sys- tem in read-write mode.
The SCS’s file system is normally mounted in a read-only mode and is run from RAM, to prolong the life (read-write cycles) of the system’s Compact Flash memory card. If the system were left in read-write mode, the life span of the SCS can be short- ened considerably.
A.1.1 Read-Write Mode
Note
It is VERY IMPORTANT to remount root as read-only when you are done with any changes (e.g., mount –o remount,ro /).
During system startup, the tar file is expanded into RAM. The root filesystem is then mounted as read-only. It must be remounted read-write in order to make changes (e.g., mount –o remount,rw /).
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