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9963 Seperate tunable for disabling ZIL vdev flush

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illumos/illumos-gate@f8fdf68125

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Author:     Prakash Surya <prakash.surya@delphix.com>
This commit is contained in:
Alexander Motin 2019-06-03 19:53:39 +00:00
parent 5f8c7a6af3
commit b62e8d32da
2 changed files with 14 additions and 6 deletions
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7
uts/common/fs/zfs/vdev_disk.c
View File

@ -37,6 +37,13 @@
#include <sys/efi_partition.h>
#include <sys/fm/fs/zfs.h>
/*
* Tunable parameter for debugging or performance analysis. Setting this
* will cause pool corruption on power loss if a volatile out-of-order
* write cache is enabled.
*/
boolean_t zfs_nocacheflush = B_FALSE;
/*
* Virtual device vector for disks.
*/

13
uts/common/fs/zfs/zil.c
View File

@ -95,11 +95,12 @@ int zfs_commit_timeout_pct = 5;
int zil_replay_disable = 0;
/*
* Tunable parameter for debugging or performance analysis. Setting
* zfs_nocacheflush will cause corruption on power loss if a volatile
* out-of-order write cache is enabled.
* Disable the DKIOCFLUSHWRITECACHE commands that are normally sent to
* the disk(s) by the ZIL after an LWB write has completed. Setting this
* will cause ZIL corruption on power loss if a volatile out-of-order
* write cache is enabled.
*/
boolean_t zfs_nocacheflush = B_FALSE;
boolean_t zil_nocacheflush = B_FALSE;
/*
* Limit SLOG write size per commit executed with synchronous priority.
@ -991,7 +992,7 @@ zil_lwb_add_block(lwb_t *lwb, const blkptr_t *bp)
int ndvas = BP_GET_NDVAS(bp);
int i;
if (zfs_nocacheflush)
if (zil_nocacheflush)
return;
mutex_enter(&lwb->lwb_vdev_lock);
@ -1015,7 +1016,7 @@ zil_lwb_add_txg(lwb_t *lwb, uint64_t txg)
/*
* This function is a called after all VDEVs associated with a given lwb
* write have completed their DKIOCFLUSHWRITECACHE command; or as soon
* as the lwb write completes, if "zfs_nocacheflush" is set.
* as the lwb write completes, if "zil_nocacheflush" is set.
*
* The intention is for this function to be called as soon as the
* contents of an lwb are considered "stable" on disk, and will survive