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RAID: Add new 'raid10_segtype_default' setting in lvm.conf
If '--mirrors/-m' and '--stripes/-i' are used together when creating a logical volume, mirrors-over-stripes is currently chosen. The user can override this by using the '--type raid10' option on creation. However, we want a place where we can set the default behavior to 'raid10' explicitly - similar to the "mirror" and "raid1" tunable, mirror_segtype_default. A follow-on patch should use this new setting to change the default from "mirror" to "raid10", as this is the preferred segment type.
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@ -498,6 +498,23 @@ global {
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# setting.
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mirror_segtype_default = "mirror"
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# 'raid10_segtype_default' determines the segment types used by default
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# when the '--stripes/-i' and '--mirrors/-m' arguments are both specified
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# during the creation of a logical volume.
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# Possible settings include:
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#
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# "raid10" - This implementation leverages MD's RAID10 personality through
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# device-mapper.
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#
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# "mirror" - LVM will layer the 'mirror' and 'stripe' segment types. It
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# will do this by creating a mirror on top of striped sub-LVs;
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# effectively creating a RAID 0+1 array. This is suboptimal
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# in terms of providing redunancy and performance. Changing to
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# this setting is not advised.
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# Specify the '--type <raid10|mirror>' option to override this default
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# setting.
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raid10_segtype_default "mirror"
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# The default format for displaying LV names in lvdisplay was changed
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# in version 2.02.89 to show the LV name and path separately.
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# Previously this was always shown as /dev/vgname/lvname even when that
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@ -56,6 +56,7 @@
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#define DEFAULT_MIRROR_LOG_FAULT_POLICY "allocate"
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#define DEFAULT_MIRROR_IMAGE_FAULT_POLICY "remove"
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#define DEFAULT_MIRROR_MAX_IMAGES 8 /* limited by kernel DM_KCOPYD_MAX_REGIONS */
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#define DEFAULT_RAID10_SEGTYPE "mirror"
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#define DEFAULT_RAID_FAULT_POLICY "warn"
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#define DEFAULT_DMEVENTD_RAID_LIB "libdevmapper-event-lvm2raid.so"
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#define DEFAULT_DMEVENTD_MIRROR_LIB "libdevmapper-event-lvm2mirror.so"
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@ -673,11 +673,12 @@ static int _lvcreate_params(struct lvcreate_params *lp,
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/* Set default segtype */
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if (arg_count(cmd, mirrors_ARG))
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/*
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* FIXME: Add default setting for when -i and -m arguments
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* are both given. We should default to "raid10".
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*/
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segtype_str = find_config_tree_str(cmd, "global/mirror_segtype_default", DEFAULT_MIRROR_SEGTYPE);
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if (arg_uint_value(cmd, arg_count(cmd, stripes_long_ARG) ?
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stripes_long_ARG : stripes_ARG, 1) > 1) {
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segtype_str = find_config_tree_str(cmd, "global/raid10_segtype_default", DEFAULT_RAID10_SEGTYPE);
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} else {
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segtype_str = find_config_tree_str(cmd, "global/mirror_segtype_default", DEFAULT_MIRROR_SEGTYPE);
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}
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else if (arg_count(cmd, thin_ARG) || arg_count(cmd, thinpool_ARG))
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segtype_str = "thin";
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else
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