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authorSerapheim Dimitropoulos <[email protected]>2019-01-25 16:38:27 -0800
committerBrian Behlendorf <[email protected]>2019-01-25 16:38:27 -0800
commitc853f382db731e15a87512f4ef1101d14d778a55 (patch)
tree8f0ba611f5c4031bb55e61fb87b695fa4db3ea38 /tests
parentdf72b8bebe0ebac0b20e0750984bad182cb6564a (diff)
Change target size of metaslabs from 256GB to 16GB
= Old behavior For vdev sizes 100GB to 50TB we keep ~200 metaslabs per vdev and the metaslab size grows from 512MB to 256GB. For vdev's bigger than that we start increasing the number of metaslabs until we hit the 128K limit. = New Behavior For vdev sizes 100GB to 3TB we keep ~200 metaslabs per vdev and the metaslab size grows from 512MB to 16GB. For vdev's bigger than that we start increasing the number of metaslabs until we hit the 128K limit. = Reasoning The old behavior makes metaslabs grow in size when the vdev range is between 3TB (ms_size 16GB) and 32PB (ms_size 256GB). Even though keeping the number of metaslabs is good in terms of potential number of I/Os per TXG, these bigger metaslabs take longer to be loaded and after they are loaded they can take up a lot of memory because of their range trees. This change tries to put a boundary in memory and loading time for the specific range of vdev sizes. Reviewed-by: Matt Ahrens <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Don Brady <[email protected]> Signed-off-by: Serapheim Dimitropoulos <[email protected]> Closes #8324
Diffstat (limited to 'tests')
-rwxr-xr-xtests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_config_changed.ksh4
1 files changed, 2 insertions, 2 deletions
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_config_changed.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_config_changed.ksh
index 82900f4ee..e8f393760 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_config_changed.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_config_changed.ksh
@@ -48,7 +48,7 @@ function custom_cleanup
{
set_vdev_validate_skip 0
cleanup
- log_must set_tunable64 vdev_min_ms_count 16
+ log_must set_tunable64 zfs_vdev_min_ms_count 16
}
log_onexit custom_cleanup
@@ -208,7 +208,7 @@ increase_device_sizes $(( FILE_SIZE * 4 ))
# Increase the number of metaslabs for small pools temporarily to
# reduce the chance of reusing a metaslab that holds old MOS metadata.
-log_must set_tunable64 vdev_min_ms_count 150
+log_must set_tunable64 zfs_vdev_min_ms_count 150
# Part of the rewind test is to see how it reacts to path changes
typeset pathstochange="$VDEV0 $VDEV1 $VDEV2 $VDEV3"