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memory is being used, and many new memory access calls are made along with normal file reading and writing, so-called disk thrashing can occur, since the number of disk operations requested far exceeds the capacity of the disk to read and write. If disk thrashing is a common occurrence, then you should install extra physical RAM in the system or tune the file system with tunefs. It is important to note that virtual memory should generally be added to the system at twice the physical RAM installed. Thus, for a 256MB system, 512MB of virtual memory should be initialized. To add virtual memory, you should use the mkfile command to create an empty file of the required size. For example, to create two swap files with 4,097,072KB each, you would use the following commands:
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# mkfile 4097072k /u1/swap # mkfile 4097072k /u2/swap
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Next, you must use the swap command to add the file into the pool of available disk space. For example, if you create two swap files on different file systems for redundancy (such as /u1/swap and /u2/swap), you can use the following commands to add them to the swap space pool:
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# swap -a /u1/swap # swap -a /u2/swap
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To verify that the swap file has been correctly added to the pool, use the following command:
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# swap -l swapfile /dev/dsk/c0t0d0s1 /dev/dsk/c3t4d0s1
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In this example, you can see that the partitions c0t0d0s1 and c3t4d0s1 have 8,194,144 blocks each allocated for swap, and have 6,240,336 and 6,236,384 free blocks, respectively. A summary of the swap space can also be printed by using the swap s command:
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# /usr/sbin/swap -s total: 2360832k bytes allocated + 130312k reserved = 2491144k used, 7238792k available
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In this example, you can see that 2,360,832KB has been allocated, while 130,312KB has been reserved. 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
19:
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To ensure that this partition is added as swap during boot, enter the following into the /etc/vfstab file:
#device device #to mount to fsck /dev/dsk/c1t1d2s1 mount point FS type swap fsck pass mount atboot no mount ops -
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
You could then safely delete the file /u1/swap and safely use the slice /dev/dsk/c1t1d2s1 for other purposes, as long as the /etc/vfstab entries have been deleted. An issue that commonly arises when swap partitions are enabled on production systems is whether or not swap space should be created on a mirrored partition (i.e., RAID level 1). Mirroring ensures that when data is written to a partition on one disk it is also copied in full to a sister partition on another drive. This ensures that if data on the first drive is destroyed, it can be recovered automatically from the mirrored volume. Creating swap files on mirrored partitions ensures that virtual memory cannot be corrupted by a disk failure. Thus, if a disk containing virtual memory for a production system is corrupted while executing a critical application, such as a database server, then the correct data will automatically be read from the mirrored volume if corruption is detected. However, since RAID mirroring requires that all data written to the source volume also be written immediately afterward to the mirrored volume, this can significantly slow down effective write speeds for the entire system, since data must be written twice.
Summary
In this chapter, you have examined some novel uses of file systems for storing process trees and simulating memory. Since file systems are generic persistence devices, they can be used in many different ways and not just for storing user and system files.
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