Linux下怎样增加虚拟内存

Linux虚拟内存就是swap分区，也叫交换分区。如果你的swap分区在/分区之后而且swap后面还有空白空间的话，可以格式化掉swap然后重新建一个更大的swap分区；如果swap在/分区之前的，调整很有可能会引起无法启动，特别是/分区大小千万不要调整，不然肯定会启动不了。

linux 添加硬盘如何不重启

1. 添加了磁盘后查看，没有刷新出来

[root@node /]# fdisk -l

Disk /dev/sda: 17.2 GB, 17179869184 bytes

255 heads, 63 sectors/track, 2088 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000aa84a

Device Boot Start End Blocks Id System

/dev/sda1 * 1208916775168 83 Linux

/dev/sda2208920891024 82 Linux swap / Solaris

2. 查看主机总线号

root@node /]# ls /sys/class/scsi_host/

host0 host1 host2

3.重新扫描SCSI总线来添加设备

[root@node /]# echo "- - -" >/sys/class/scsi_host/host0/scan

[root@node /]# echo "- - -" >/sys/class/scsi_host/host1/scan

[root@node /]# echo "- - -" >/sys/class/scsi_host/host2/scan

4. 查看磁盘，可以看到 /dev/sdb :53.7G 这个就是新加的盘

[root@node /]# fdisk -l

Disk /dev/sda: 17.2 GB, 17179869184 bytes

255 heads, 63 sectors/track, 2088 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000aa84a

Device Boot Start End Blocks Id System

/dev/sda1 * 1208916775168 83 Linux

/dev/sda2208920891024 82 Linux swap / Solaris

Disk /dev/sdb: 53.7 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

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