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The lofiadm command is used to initialize a file on an existing partition that is labeled as a raw device, by using the loopback file device driver. You can then create a new file system on the device by using newfs or mkfs as if it were a separate partition. This can
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Installing Disks and File Systems
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be useful if a new partition needs to be created, but the disk cannot be easily reformatted, particularly if it s only required temporarily. To create a file system on a file, you should use the mkfile command to create a file to be a specific size. Next, you need to make the association between the file and the loopback file device driver. For example, if the file /tmp/datafile was created with mkfile, the following command would create the association:
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# lofiadm -a /tmp/datafile /dev/lofi/2
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Finally, you can create a new file system by using the newfs command:
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# newfs /dev/rlofi/2 newfs: construct a new file system /dev/rlofi/2: (y/n) y
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You can then mount the file system on a mount point (such as /testdata) as required:
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# mount /dev/lofi/2 /testdata
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When the file system is no longer required, you can use the umount command to remove the file system from operation, while you can use the lofiadm command to remove the association between the file and the loopback file device driver:
# umount /testdata # lofiadm -d /tmp/datafile
swap
The swap command is used to add virtual RAM to a system. Virtual RAM is typically used to provide memory for process execution when physical memory has been exhausted. Disk blocks are used to simulate physical memory locations, using an interface that is invisible to the user. Thus, users never need to be concerned about the type of RAM that their process is addressing. While virtual memory allows a system s effective capacity to be increased to many times its physical capacity, it is much slower than physical RAM. When a system experiences peak demands for memory, causing virtual memory to be used, the CPU must work harder to support virtual memory operations. Coupled with the relatively slow speed of disk writing, this has a significant impact on performance. When virtual memory is being utilized, and many new memory access calls are made along with normal file reading and writing, so-called disk thrashing (the excessive use of virtual memory) can occur, since the number of disk operations requested far exceeds the capacity of the disk to read and write. If this is a common occurrence, then you should install extra physical RAM into the system and/or tune the file system with tunefs. Virtual memory should generally be added to the system at twice the physical RAM installed. Thus, for a 256MB system, you should initialize 512MB of virtual memory. To
Part IV:
Managing Devices
add virtual memory, you should use the mkfile command to create an empty file of the required size. Next, use the swap command to add the file into the pool of available disk space. For example, if two swap files are created on different file systems for redundancy (such as /u1/swap and /u2/swap), you can add them to the swap space pool by using the following commands:
# swap -a /u1/swap # swap -a /u2/swap
To verify that the swap has been correctly added to the pool, use the following command:
# swap l
If you have a dedicated slice set aside for swap, then you can simply pass the block device name on the command line:
# swap a /dev/dsk/c1t1d2s1
To remove a file (or device) from the swap pool, you need to pass the d option on the command line. Thus, to remove /u1/swap and /dev/dsk/c1t1d2s1 from the swap pool, you would use the following commands:
# swap -d /u1/swap # swap d /dev/dsk/c1t1d2s1
The file /u1/swap can now be safely deleted, and the slice /dev/dsk/c1t1d2s1 can be safely used for other purposes. Note that labeling a disk as a swap is very useful, as this allows you to use space near the center of the disk for swap.
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