Jonathan Brassow 2e0740f7ef RAID: Add writemostly/writebehind support for RAID1 ... 'lvchange' is used to alter a RAID 1 logical volume's write-mostly and write-behind characteristics. The '--writemostly' parameter takes a PV as an argument with an optional trailing character to specify whether to set ('y'), unset ('n'), or toggle ('t') the value. If no trailing character is given, it will set the flag. Synopsis: lvchange [--writemostly <PV>:{t|y|n}] [--writebehind <count>] vg/lv Example: lvchange --writemostly /dev/sdb1:y --writebehind 512 vg/raid1_lv The last character in the 'lv_attr' field is used to show whether a device has the WriteMostly flag set. It is signified with a 'w'. If the device has failed, the 'p'artial flag has priority. Example ("nosync" raid1 with mismatch_cnt and writemostly): [~]# lvs -a --segment vg LV VG Attr #Str Type SSize raid1 vg Rwi---r-m 2 raid1 500.00m [raid1_rimage_0] vg Iwi---r-- 1 linear 500.00m [raid1_rimage_1] vg Iwi---r-w 1 linear 500.00m [raid1_rmeta_0] vg ewi---r-- 1 linear 4.00m [raid1_rmeta_1] vg ewi---r-- 1 linear 4.00m Example (raid1 with mismatch_cnt, writemostly - but failed drive): [~]# lvs -a --segment vg LV VG Attr #Str Type SSize raid1 vg rwi---r-p 2 raid1 500.00m [raid1_rimage_0] vg Iwi---r-- 1 linear 500.00m [raid1_rimage_1] vg Iwi---r-p 1 linear 500.00m [raid1_rmeta_0] vg ewi---r-- 1 linear 4.00m [raid1_rmeta_1] vg ewi---r-p 1 linear 4.00m A new reportable field has been added for writebehind as well. If write-behind has not been set or the LV is not RAID1, the field will be blank. Example (writebehind is set): [~]# lvs -a -o name,attr,writebehind vg LV Attr WBehind lv rwi-a-r-- 512 [lv_rimage_0] iwi-aor-w [lv_rimage_1] iwi-aor-- [lv_rmeta_0] ewi-aor-- [lv_rmeta_1] ewi-aor-- Example (writebehind is not set): [~]# lvs -a -o name,attr,writebehind vg LV Attr WBehind lv rwi-a-r-- [lv_rimage_0] iwi-aor-w [lv_rimage_1] iwi-aor-- [lv_rmeta_0] ewi-aor-- [lv_rmeta_1] ewi-aor--		2013-04-15 13:59:46 -05:00
..
archive.c	cleanup: drop unneeded included header files	2012-08-23 14:37:20 +02:00
archiver.c	thin: allow restore with --force	2012-11-27 14:08:24 +01:00
archiver.h	thin: allow restore with --force	2012-11-27 14:08:24 +01:00
export.c	pv_header_extension: add support for writing PV header extension (flags & Embedding Area)	2013-02-26 11:28:00 +01:00
flags.c	RAID: Add writemostly/writebehind support for RAID1	2013-04-15 13:59:46 -05:00
format-text.c	config: refer to config nodes using assigned IDs	2013-03-06 10:14:33 +01:00
format-text.h	pv_header_extension: add supporting infrastructure for PV header extension (flags & Embedding Area)	2013-02-26 11:25:16 +01:00
import_vsn1.c	pv_header_extension: add support for reading PV header extension (flags & Embedding Area)	2013-02-26 11:27:23 +01:00
import-export.h	Pass 'single_device' parameter down to suppress 'Can't find uuid' messages	2012-02-29 02:35:35 +00:00
import.c	cleanup: drop unneeded included header files	2012-08-23 14:37:20 +02:00
layout.h	cleanup: remove struct pv_header_extension reference from struct pv_header	2013-02-27 10:47:24 +01:00
tags.c	Move the core of the lib/config/config.c functionality into libdevmapper,	2011-08-30 14:55:15 +00:00
text_export.h	Move the core of the lib/config/config.c functionality into libdevmapper,	2011-08-30 14:55:15 +00:00
text_import.h	Replace const usage of dm_config_find_node with more appropriate value-lookup	2011-08-31 15:19:19 +00:00
text_label.c	pv_header_extension: add support for writing PV header extension (flags & Embedding Area)	2013-02-26 11:28:00 +01:00