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--- docs:tips_n_tricks:softraid.html [16.03.2010 17:55 CET] – created peter
+++ docs:tips_n_tricks:softraid.html [22.09.2019 17:29 CEST] (current) – [Increas resync speed] peter
@@ Line 2: / Line 2: @@
 ===== Create an RAID1 array degraded =====
-  mdadm --build --level 1 -n 2 /dev/md0 /dev/sda1 missing
+  mdadm --create --level 1 -n 2 /dev/md0 /dev/sda1 missing
+don't mix up ''--create'' and ''--build'', as the latter will not write meta date to the partion.
+===== Resize RAID1 after underlying partitions are resized =====
+  mdadm --grow /dev/md0 --bitmap none
+  mdadm --grow /dev/md0 --z max
+  ( mdadm -W /dev/md0 && mdadm --grow /dev/md0 --bitmap internal ) &
+  watch 'cat /proc/mdstat ; mdadm --detail /dev/md0 | fgrep -i bitmap'
+===== Increase resync speed =====
+Increase values in
+  /proc/sys/dev/raid/speed_limit_min
+  /proc/sys/dev/raid/speed_limit_max
+or in
+  /sys/block/md*/md/sync_speed_min
+  /sys/block/md*/md/sync_speed_max
+respectively