From: Grant Slater <git@firefishy.com>
Date: Fri, 29 May 2020 17:09:09 +0000 (+0100)
Subject: Allow md raid to use multiple threads for RAID5 and 6
X-Git-Url: https://git.openstreetmap.org./chef.git/commitdiff_plain/d6756277b3beb765f0b66df53a96395b9f94dfd4

Allow md raid to use multiple threads for RAID5 and 6
---

diff --git a/cookbooks/devices/templates/default/udev.rules.erb b/cookbooks/devices/templates/default/udev.rules.erb
index 453357815..0576d8670 100644
--- a/cookbooks/devices/templates/default/udev.rules.erb
+++ b/cookbooks/devices/templates/default/udev.rules.erb
@@ -97,6 +97,6 @@ ACTION=="add", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{ID_MODEL}=="QEMU_HA
 ACTION=="add", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{ID_MODEL}=="QEMU_HARDDISK", ATTR{queue/scheduler}="noop"
 # Vendor is sometimes missing
 
-# Increase default MD raid5/raid6 strip cache
-ACTION=="add", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{MD_LEVEL}=="raid5", ATTR{md/stripe_cache_size}="8192"
-ACTION=="add", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{MD_LEVEL}=="raid6", ATTR{md/stripe_cache_size}="8192"
+# Increase default MD raid5/raid6 strip cache + group_thread_cnt
+ACTION=="add", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{MD_LEVEL}=="raid5", ATTR{md/stripe_cache_size}="8192", ATTR{md/group_thread_cnt}="4"
+ACTION=="add", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{MD_LEVEL}=="raid6", ATTR{md/stripe_cache_size}="8192", ATTR{md/group_thread_cnt}="4"