Documentation/scsi/sd-parameters.rst

Source file repositories/reference/linux-study-clean/Documentation/scsi/sd-parameters.rst

File Facts

System: Linux kernel
Corpus path: Documentation/scsi/sd-parameters.rst
Extension: .rst
Size: 993 bytes
Lines: 28
Domain: Support Tooling And Documentation
Bucket: Documentation
Inferred role: Support Tooling And Documentation: documentation
Status: atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.. SPDX-License-Identifier: GPL-2.0

======================================
Linux SCSI Disk Driver (sd) Parameters
======================================

cache_type (RW)
---------------
Enable/disable drive write & read cache.

===========================   === ===   ===========   ==========
 cache_type string            WCE RCD   Write cache   Read cache
===========================   === ===   ===========   ==========
 write through                0   0     off           on
 none                         0   1     off           off
 write back                   1   0     on            on
 write back, no read (daft)   1   1     on            off
===========================   === ===   ===========   ==========

To set cache type to "write back" and save this setting to the drive::

  # echo "write back" > cache_type

To modify the caching mode without making the change persistent, prepend
"temporary " to the cache type string. E.g.::

  # echo "temporary write back" > cache_type

Annotation

Atlas domain: Support Tooling And Documentation / Documentation.
Implementation status: atlas-only.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.