Example output:
./mdadm --detail /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Wed May 13 17:01:12 2015
Raid Level : raid5
Array Size : 11720662464 (11177.69 GiB 12001.96 GB)
Used Dev Size : 3906887488 (3725.90 GiB 4000.65 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed May 13 17:01:12 2015
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 32K
Name : 0
UUID : 8fb9ee05:3831d52f:e5c23825:28cd6881
Events : 0
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
1 8 48 1 active sync /dev/sdd
2 8 64 2 active sync /dev/sde
3 8 80 3 active sync /dev/sdf
4 8 17 - cache /dev/sdb1
Signed-off-by: Song Liu <songliubraving@xxxxxx>
---
Detail.c | 3 ++-
md_p.h | 2 ++
super1.c | 2 ++
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/Detail.c b/Detail.c
index dd72ede..c93a962 100644
--- a/Detail.c
+++ b/Detail.c
@@ -650,9 +650,10 @@ This is pretty boring
}
if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
+ if (disk.state & (1<<MD_DISK_WRITECACHE)) printf(" cache");
if ((disk.state &
((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)
- |(1<<MD_DISK_REMOVED)|(1<<MD_DISK_FAULTY)))
+ |(1<<MD_DISK_REMOVED)|(1<<MD_DISK_FAULTY)|(1<<MD_DISK_WRITECACHE)))
== 0) {
printf(" spare");
if (is_26) {
diff --git a/md_p.h b/md_p.h
index c4846ba..f45c4e0 100644
--- a/md_p.h
+++ b/md_p.h
@@ -85,6 +85,8 @@
*/
#define MD_DISK_REPLACEMENT 17
+#define MD_DISK_WRITECACHE 18 /* disk is used as the write cache in RAID-5/6 */
+
typedef struct mdp_device_descriptor_s {
__u32 number; /* 0 Device number in the entire set */
diff --git a/super1.c b/super1.c
index f0508fe..7af0fd5 100644
--- a/super1.c
+++ b/super1.c
@@ -465,6 +465,8 @@ static void examine_super1(struct supertype *st, char *homehost)
role = 0xFFFF;
if (role >= 0xFFFE)
printf("spare\n");
+ else if (role == 0xFFFD)
+ printf("cache\n");
else if (sb->feature_map & __cpu_to_le32(MD_FEATURE_REPLACEMENT))
printf("Replacement device %d\n", role);
else
--
1.8.1
--
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