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Jeremy Garcia
Jeremy Garcia

Linux File Systems Moshe Bar Pdf [TOP]


The kernel provides the essential services that make up the heart of UNIX systems; it allocates memory, keeps track of the physical location of files on the computer's hard disks, loads and executes binary programs such as shells, and schedules the task swapping without which UNIX systems would be incapable of doing more than one thing at a time. The kernel accomplishes all these tasks by providing an interface between the other programs running under its control and the physical hardware of the computer; this interface, the system call interface, effectively insulates the other programs on the UNIX system from the complexities of the computer. For example, when a running program needs access to a file, it cannot simply open the file; instead it issues a system call which asks the kernel to open the file. The kernel takes over and handles the request, then notifies the program whether the request succeeded or failed. To read data in from the file takes another system call; the kernel determines whether or not the request is valid, and if it is, the kernel reads the required block of data and passes it back to the program. Unlike DOS (and some other operating systems), UNIX system programs do not have access to the physical hardware of the computer. All they see are the kernel services, provided by the system call interface.




Linux File Systems Moshe Bar Pdf


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Well, for starters, most likely, the one thing most people tend to overlook, is the filesystem they choose to format their new NVMe SSD with. Two of the most popular filesystems on Linux are "The Fourth Extended Filesystem" or as it is also known: "ext4", and XFS, which is a 64-bit journalling file system created by Silicon Graphics, Inc


EXT4 and XFS are robust, journalling filesystems, and very well known and supported in the Linux world. They are also given as options for formatting hard drives, during installation of the various Linux distributions. But what is not as well known, is that EXT4 and XFS, like most other filesystems, were never intended to be used on anything other than spinning hard drives.


For a system using LILO, edit the lilo.conf file, so lilo uses the initrd, and add the following: image = /boot/vmlinuz-generic-4.19.69 initrd = /boot/initrd.gz root = /dev/slackware/root label = linux read-only


One thing though - you don't mention RAID setup. While I prefer to separate OS and other filesystems as you mentioned I would not do it at the cost of RAID redundancy of the drives. Rather I'd put both drives into a RAID1 setup (NVME hardware or meta disk) then use that as the PV for the VG then create separate LVs for the OS and other filesystems. Of course I'd lose space availability of the equivalent of one drive but wouldn't have to worry about one drive going down blowing me out of the water as I would in a non-RAID config.


While designing a file system specifically with the underlying media in thought might seem like a good idea, I can't help but to wonder if the manufacturers of these devices thought: "Someone will probably come up with a file system that actually works well with these devices, one day" or if they are well suited for the file systems that were available at the time of their introduction.


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