1 files changed, 0 insertions, 28 deletions
diff --git a/0 Inbox/Writeback cache.md b/0 Inbox/Writeback cache.md
deleted file mode 100644
index 83495c4..0000000
--- a/0 Inbox/Writeback cache.md
+++ /dev/null
@@ -1,28 +0,0 @@
----
-tags:
-  - linux
-  - qemu
-  - filesystem
-references:
-  - https://avidandrew.com/understanding-disk-cache-writeback-ext4.html
-  - https://docs.kernel.org/admin-guide/sysctl/vm.html#dirty-expire-centisecs
----
-normal: write() -> cache (multiple layers) -> disk
-
-# Physical server write cache
-![[physical_write_cache.png]] 
-
-Page cache -> RAM
-
-Journal -> ensures data is fully written before the transaction is considered complete.
-`commit` mount option -> flushes cache to disk every x seconds (configurable)
-`barrier` mount option -> enables the ordering of groups of writes, controller ensures writes before barrier are written before writes after barrier.
-
-`commit` + dirty_expire_centisecs [2] ~ automatic persisting of data.
-
-If we call `sync`, `fsync` or `fdatasync` ourselves our data is forced on-disk right away by the kernel, no need to wait for commit + dirty_expirty_centisecs.
-
-# VM Write cache
- Guest has its own page cache
- ![[vm_write_cache.png]]
- 
-\ No newline at end of file