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ramdisk (7)
  • >> ramdisk (7) ( Solaris man: Макропакеты и соглашения )
  • Ключ ramdisk обнаружен в базе ключевых слов.
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    NAME

    ramdisk - RAM disk device driver
     
    

    SYNOPSIS

    ramdisk@0:diskname
    

     

    DESCRIPTION

    The ramdisk driver supports numerous ramdisk devices that are created by the system during the boot process (see boot(1M)) or during normal system operation (see ramdiskadm(1M) for more information).  

    DEVICE SPECIAL FILES

    Each ramdisk can be accessed either as a block device or as a raw device. When accessed as a block device, the normal buffering mechanism is used when reading from and writing to the device, without regard to physical disk records. Accessing the ramdisk as a raw device enables direct transmission between the disk and the read or write buffer. A single read or write call usually results in a single I/O operation, meaning that raw I/O is more efficient when many bytes are transmitted. You can find block files names in /dev/ramdisk. Raw file names are found in /dev/rramdisk.

    There are no alignment or length restrictions on I/O requests to either block or character devices.  

    ERRORS

    EFAULT

    The argument features a bad address.

    EINVAL

    Invalid argument. EIO. An I/O error occurred.

    EPERM

    Cannot create or delete a ramdisk without write permission on /dev/ramdiskctl.

    ENOTTY

    The device does not support the requested ioctl function.

    ENXIO

    The device did not exist during opening.

    EBUSY

    Cannot exclusively open /dev/ramdiskctl. One or more ramdisks are still open.

    EEXIST

    A ramdisk with the indicated name already exists.

    EAGAIN

    Cannot allocate resource for ramdisk. Try again later.

     

    FILES

    /dev/ramdisk/diskname

    Block device for ramdisk named diskname.

    /dev/rramdisk/diskname

    Raw device for ramdisk name diskname

    /kernel/drv/ramdisk

    32-bit driver

    /kernel/drv/ramdisk.conf

    Driver configuration file. (Do not alter).

    /kernel/drv/sparcv9/ramdisk

    64-bit driver

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attribute:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityEvolving

     

    SEE ALSO

    ramdiskadm(1M), fsck(1M), fstyp(1M), mount(1M), newfs(1M), driver.conf(4), filesystem(5), dkio(7I)  

    NOTES

    The percentage of available physical memory that can be allocated to ramdisks is constrained by the variable rd_percent_physmem. You can tune the rd_percent_physmem variable in /etc/system. By default, the percentage of available physical memory that can be allocated to ramdisks is fixed at 25%.

    A ramdisk may not be the best possible use of system memory. Accordingly, use ramdisks only when absolutely necessary.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    DEVICE SPECIAL FILES
    ERRORS
    FILES
    ATTRIBUTES
    SEE ALSO
    NOTES


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