svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
ramdisk(4d)
ramdisk(4D) Device Drivers & /dev files ramdisk(4D)
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(8)) or during normal
system operation (see ramdiskadm(8) for more information).
DEVICE SPECIAL FILES
Each ramdisk can be accessed either as a block device or as a raw de‐
vice. 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/amd64/ramdisk
x86 kernel module
/kernel/drv/ramdisk.conf
Driver configuration file. (Do not alter).
/kernel/drv/sparcv9/ramdisk
SPARC kernel module
ATTRIBUTES
See attributes(7) for descriptions of the following attribute:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ ArchitectureSPARC, x86 _ Availabilitysystem/kernel _
Interface StabilityCommitted
SEE ALSO
dkio(4I), driver.conf(5), filesystem(7), fsck(8), fstyp(8), mount(8),
newfs(8), ramdiskadm(8)
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. Accord‐
ingly, use ramdisks only when absolutely necessary.
Oracle Solaris 11.4 15 Mar 2024 ramdisk(4D)