RAID10 - writemostly don't work that proper
by Reindl Harald
/dev/sda: Samsung SSD 850 EVO 2TB
/dev/sdb: Samsung SSD 850 EVO 2TB
/dev/sdc: ST2000DX002-2DV164
/dev/sdd: ST2000DX002-2DV164
normally i would expect that for heavy read-IO the two HDD drives would
sleep and the two SSD working more or less like a RAID0 but as example
running a btrfs-srub within a virtual machine on a 1.5 TB vdisk you can
hear the rotating disks clearly and there are also unexpected lags while
a disk IO auf around 700 MB/sec shows that it's basicly working
pretty sure the lags are coming because read-access is also spread to
HDD - why is that?
/dev/md2:
Version : 1.1
Creation Time : Wed Jun 8 13:10:56 2011
Raid Level : raid10
Array Size : 3875222528 (3695.70 GiB 3968.23 GB)
Used Dev Size : 1937611264 (1847.85 GiB 1984.11 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sat Feb 11 15:10:31 2017
State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Name : localhost.localdomain:2 (local to host
localhost.localdomain)
UUID : ea253255:cb915401:f32794ad:ce0fe396
Events : 1818029
Number Major Minor RaidDevice State
4 8 35 0 active sync set-A writemostly
/dev/sdc3
5 8 19 1 active sync set-B /dev/sdb3
7 8 51 2 active sync set-A writemostly
/dev/sdd3
6 8 3 3 active sync set-B /dev/sda3
7 years, 2 months
- 2
- 3
[PATCH] set zEC12 as minimum hw level for s390x
by Dan Horák
---
baseconfig/s390x/CONFIG_MARCH_Z900 | 1 -
baseconfig/s390x/CONFIG_MARCH_Z990 | 1 -
baseconfig/s390x/CONFIG_MARCH_Z9_109 | 1 -
baseconfig/s390x/CONFIG_MARCH_ZEC12 | 1 +
4 files changed, 1 insertion(+), 3 deletions(-)
delete mode 100644 baseconfig/s390x/CONFIG_MARCH_Z900
delete mode 100644 baseconfig/s390x/CONFIG_MARCH_Z990
delete mode 100644 baseconfig/s390x/CONFIG_MARCH_Z9_109
create mode 100644 baseconfig/s390x/CONFIG_MARCH_ZEC12
diff --git a/baseconfig/s390x/CONFIG_MARCH_Z900 b/baseconfig/s390x/CONFIG_MARCH_Z900
deleted file mode 100644
index 6fa9110..0000000
--- a/baseconfig/s390x/CONFIG_MARCH_Z900
+++ /dev/null
@@ -1 +0,0 @@
-# CONFIG_MARCH_Z900 is not set
diff --git a/baseconfig/s390x/CONFIG_MARCH_Z990 b/baseconfig/s390x/CONFIG_MARCH_Z990
deleted file mode 100644
index b0c3638..0000000
--- a/baseconfig/s390x/CONFIG_MARCH_Z990
+++ /dev/null
@@ -1 +0,0 @@
-# CONFIG_MARCH_Z990 is not set
diff --git a/baseconfig/s390x/CONFIG_MARCH_Z9_109 b/baseconfig/s390x/CONFIG_MARCH_Z9_109
deleted file mode 100644
index e19e966..0000000
--- a/baseconfig/s390x/CONFIG_MARCH_Z9_109
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_MARCH_Z9_109=y
diff --git a/baseconfig/s390x/CONFIG_MARCH_ZEC12 b/baseconfig/s390x/CONFIG_MARCH_ZEC12
new file mode 100644
index 0000000..7dbcbb3
--- /dev/null
+++ b/baseconfig/s390x/CONFIG_MARCH_ZEC12
@@ -0,0 +1 @@
+CONFIG_MARCH_ZEC12=y
--
2.7.4
7 years, 2 months
- 3
- 4