diff options
Diffstat (limited to 'man/man5/zfs-module-parameters.5')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 81 |
1 files changed, 77 insertions, 4 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index ab1c15841..0447debf7 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -1413,6 +1413,79 @@ Default value: \fB0\fR. .sp .ne 2 .na +\fBzfs_multihost_history\fR (int) +.ad +.RS 12n +Historical statistics for the last N multihost updates will be available in +\fB/proc/spl/kstat/zfs/<pool>/multihost\fR +.sp +Default value: \fB0\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_multihost_interval\fR (ulong) +.ad +.RS 12n +Used to control the frequency of multihost writes which are performed when the +\fBmultihost\fR pool property is on. This is one factor used to determine +the length of the activity check during import. +.sp +The multihost write period is \fBzfs_multihost_interval / leaf-vdevs\fR milliseconds. +This means that on average a multihost write will be issued for each leaf vdev every +\fBzfs_multihost_interval\fR milliseconds. In practice, the observed period can +vary with the I/O load and this observed value is the delay which is stored in +the uberblock. +.sp +On import the activity check waits a minimum amount of time determined by +\fBzfs_multihost_interval * zfs_multihost_import_intervals\fR. The activity +check time may be further extended if the value of mmp delay found in the best +uberblock indicates actual multihost updates happened at longer intervals than +\fBzfs_multihost_interval\fR. A minimum value of \fB100ms\fR is enforced. +.sp +Default value: \fB1000\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_multihost_import_intervals\fR (uint) +.ad +.RS 12n +Used to control the duration of the activity test on import. Smaller values of +\fBzfs_multihost_import_intervals\fR will reduce the import time but increase +the risk of failing to detect an active pool. The total activity check time is +never allowed to drop below one second. A value of 0 is ignored and treated as +if it was set to 1 +.sp +Default value: \fB10\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_multihost_fail_intervals\fR (uint) +.ad +.RS 12n +Controls the behavior of the pool when multihost write failures are detected. +.sp +When \fBzfs_multihost_fail_intervals = 0\fR then multihost write failures are ignored. +The failures will still be reported to the ZED which depending on its +configuration may take action such as suspending the pool or offlining a device. +.sp +When \fBzfs_multihost_fail_intervals > 0\fR then sequential multihost write failures +will cause the pool to be suspended. This occurs when +\fBzfs_multihost_fail_intervals * zfs_multihost_interval\fR milliseconds have +passed since the last successful multihost write. This guarantees the activity test +will see multihost writes if the pool is imported. +.sp +Default value: \fB5\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_no_scrub_io\fR (int) .ad .RS 12n @@ -1529,8 +1602,8 @@ Default value: \fB1,048,576\fR. \fBzfs_read_history\fR (int) .ad .RS 12n -Historic statistics for the last N reads will be available in -\fR/proc/spl/kstat/zfs/POOLNAME/reads\fB +Historical statistics for the last N reads will be available in +\fB/proc/spl/kstat/zfs/<pool>/reads\fR .sp Default value: \fB0\fR (no data is kept). .RE @@ -1684,8 +1757,8 @@ Default value: \fB32\fR. \fBzfs_txg_history\fR (int) .ad .RS 12n -Historic statistics for the last N txgs will be available in -\fR/proc/spl/kstat/zfs/POOLNAME/txgs\fB +Historical statistics for the last N txgs will be available in +\fB/proc/spl/kstat/zfs/<pool>/txgs\fR .sp Default value: \fB0\fR. .RE |