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thin: support configurable thin pool defaults

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Configurable settings for thin pool create
if they are not specified on command line.

New supported lvm.conf options are:
  allocation/thin_pool_chunk_size
  allocation/thin_pool_discards
  allocation/thin_pool_zero
This commit is contained in:
Zdenek Kabelac 2012-11-26 11:20:13 +01:00
parent 953080e4fc
commit 1ef9831018
5 changed files with 63 additions and 15 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.99 -
===================================
Add lvm.conf thin pool defs thin_pool_{chunk_size|discards|zero}.
Support discards for non-power-of-2 thin pool chunks.
Automatically restore MISSING PVs with no MDAs.
When no '-i' argument is given for RAID10, default to 2 stripes.

17
doc/example.conf.in
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@ -232,6 +232,23 @@ allocation {
# Set to 1 to guarantee that thin pool metadata will always
# be placed on different PVs from the pool data.
thin_pool_metadata_require_separate_pvs = 0
# Specify the minimal chunk size (in KB) for thin pool volumes.
# Use of the larger chunk size may improve perfomance for plain
# thin volumes, however using them for snapshot volumes is less efficient,
# as it consumes more space and takes extra time for copying.
# When unset, lvm tries to estimate chunk size starting from 64KB
# Supported values are in range from 64 to 1048576.
# thin_pool_chunk_size = 64
# Specify discards behavior of the thin pool volume.
# Select one of "ignore", "nopassdown", "passdown"
# thin_pool_discards = "passdown"
# Set to 0, to disable zeroing of thin pool data chunks before their
# first use.
# N.B. zeroing larger thin pool chunk size degrades performance.
# thin_pool_zero = 1
}
# This section that allows you to configure the nature of the

3
lib/config/defaults.h
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@ -69,6 +69,9 @@
#define DEFAULT_THIN_POOL_MAX_METADATA_SIZE (16 * 1024 * 1024) /* KB */
#define DEFAULT_THIN_POOL_MIN_METADATA_SIZE 2048 /* KB */
#define DEFAULT_THIN_POOL_OPTIMAL_SIZE (128 * 1024 * 1024) /* KB */
#define DEFAULT_THIN_POOL_CHUNK_SIZE 64 /* KB */
#define DEFAULT_THIN_POOL_DISCARDS "passdown"
#define DEFAULT_THIN_POOL_ZERO 1
#define DEFAULT_UMASK 0077

11
lib/thin/thin.c
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@ -282,10 +282,15 @@ static int _thin_pool_add_target_line(struct dev_manager *dm,
return_0;
if (attr & THIN_FEATURE_DISCARDS) {
/* Use ignore for discards ignore or non-power-of-2 chunk_size and <1.5 target */
/* FIXME: Check whether underlying dev supports discards */
if (!dm_tree_node_set_thin_pool_discard(node,
seg->discards == THIN_DISCARDS_IGNORE,
seg->discards == THIN_DISCARDS_NO_PASSDOWN))
if (((!(attr & THIN_FEATURE_DISCARDS_NON_POWER_2) &&
(seg->chunk_size & (seg->chunk_size - 1))) ||
(seg->discards == THIN_DISCARDS_IGNORE)) &&
!dm_tree_node_set_thin_pool_discard(node, 1, 0))
return_0;
else if (!dm_tree_node_set_thin_pool_discard(node, 0,
(seg->discards == THIN_DISCARDS_NO_PASSDOWN)))
return_0;
} else if (seg->discards != THIN_DISCARDS_IGNORE)
log_warn_suppress(_no_discards++, "WARNING: Thin pool target does "

46
tools/toollib.c
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@ -1528,20 +1528,41 @@ int get_pool_params(struct cmd_context *cmd,
uint64_t *pool_metadata_size,
int *zero)
{
if (arg_count(cmd, zero_ARG))
const char *dstr;
if (arg_count(cmd, zero_ARG)) {
*zero = strcmp(arg_str_value(cmd, zero_ARG, "y"), "n");
else
*zero = 1; /* TODO: Make default configurable */
log_very_verbose("Setting pool zeroing: %u", *zero);
} else
*zero = find_config_tree_int(cmd,
"allocation/thin_pool_zero",
DEFAULT_THIN_POOL_ZERO);
*discards = (thin_discards_t) arg_uint_value(cmd, discards_ARG,
THIN_DISCARDS_PASSDOWN);
if (arg_sign_value(cmd, chunksize_ARG, SIGN_NONE) == SIGN_MINUS) {
log_error("Negative chunk size is invalid.");
return 0;
if (arg_count(cmd, discards_ARG)) {
*discards = (thin_discards_t) arg_uint_value(cmd, discards_ARG, 0);
log_very_verbose("Setting pool discards: %s",
get_pool_discards_name(*discards));
} else {
dstr = find_config_tree_str(cmd,
"allocation/thin_pool_discards",
DEFAULT_THIN_POOL_DISCARDS);
if (!get_pool_discards(dstr, discards))
return_0;
}
*chunk_size = arg_uint_value(cmd, chunksize_ARG,
DM_THIN_MIN_DATA_BLOCK_SIZE);
if (arg_count(cmd, chunksize_ARG)) {
if (arg_sign_value(cmd, chunksize_ARG, SIGN_NONE) == SIGN_MINUS) {
log_error("Negative chunk size is invalid.");
return 0;
}
*chunk_size = arg_uint_value(cmd, chunksize_ARG,
DM_THIN_MIN_DATA_BLOCK_SIZE);
log_very_verbose("Setting pool chunk size: %s",
display_size(cmd, *chunk_size));
} else
*chunk_size = find_config_tree_int(cmd,
"allocation/thin_pool_chunk_size",
DEFAULT_THIN_POOL_CHUNK_SIZE) * 2;
if ((*chunk_size < DM_THIN_MIN_DATA_BLOCK_SIZE) ||
(*chunk_size > DM_THIN_MAX_DATA_BLOCK_SIZE)) {
@ -1619,7 +1640,8 @@ int update_pool_params(struct cmd_context *cmd, unsigned attr,
else if (*chunk_size > DM_THIN_MAX_DATA_BLOCK_SIZE)
*chunk_size = DM_THIN_MAX_DATA_BLOCK_SIZE;
log_verbose("Setting chunk size %uKiB.", *chunk_size / 2);
log_verbose("Setting chunk size %s.",
display_size(cmd, *chunk_size));
} else if (*chunk_size < estimate_chunk_size) {
/* Suggest bigger chunk size */
log_warn("WARNING: Chunk size is smaller then suggested minimum size %s.",