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 - journal /dev/sdb1
./mdadm -E /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x201
Array UUID : 562b2334:35b9bcc1:add50892:1f30c4bd
Name : 0
Creation Time : Thu Aug 27 12:55:26 2015
Raid Level : raid5
Raid Devices : 15
Avail Dev Size : 249796608 (119.11 GiB 127.90 GB)
Array Size : 54696423936 (52162.57 GiB 56009.14 GB)
Used Dev Size : 7813774848 (3725.90 GiB 4000.65 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262056 sectors, after=0 sectors
State : active
Device UUID : 5015e522:d39ba566:5909cf3c:9c51f2ff
Internal Bitmap : 8 sectors from superblock
Update Time : Thu Aug 27 13:16:55 2015
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : 4e6fd76d - correct
Events : 262
Layout : left-symmetric
Chunk Size : 256K
Device Role : Journal
Array State : AAAAAAAAAAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
Signed-off-by: Song Liu <songliubraving@xxxxxx>
Signed-off-by: Shaohua Li <shli@xxxxxx>
---
Detail.c | 3 ++-
md_p.h | 2 ++
super1.c | 9 +++++++++
3 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/Detail.c b/Detail.c
index dd72ede..200f65f 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_JOURNAL)) printf(" journal");
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_JOURNAL)))
== 0) {
printf(" spare");
if (is_26) {
diff --git a/md_p.h b/md_p.h
index 3a3b8af..fae73ba 100644
--- a/md_p.h
+++ b/md_p.h
@@ -91,9 +91,11 @@
*/
#define MD_DISK_REPLACEMENT 17
+#define MD_DISK_JOURNAL 18 /* disk is used as the write journal in RAID-5/6 */
#define MD_DISK_ROLE_SPARE 0xffff
#define MD_DISK_ROLE_FAULTY 0xfffe
+#define MD_DISK_ROLE_JOURNAL 0xfffd
#define MD_DISK_ROLE_MAX 0xff00 /* max value of regular disk role */
typedef struct mdp_device_descriptor_s {
diff --git a/super1.c b/super1.c
index b881eb5..6905b6d 100644
--- a/super1.c
+++ b/super1.c
@@ -126,6 +126,7 @@ struct misc_dev_info {
*/
#define MD_FEATURE_NEW_OFFSET 64 /* new_offset must be honoured */
#define MD_FEATURE_BITMAP_VERSIONED 256 /* bitmap version number checked properly */
+#define MD_FEATURE_JOURNAL 512 /* support write journal */
#define MD_FEATURE_ALL (MD_FEATURE_BITMAP_OFFSET \
|MD_FEATURE_RECOVERY_OFFSET \
|MD_FEATURE_RESHAPE_ACTIVE \
@@ -134,6 +135,7 @@ struct misc_dev_info {
|MD_FEATURE_RESHAPE_BACKWARDS \
|MD_FEATURE_NEW_OFFSET \
|MD_FEATURE_BITMAP_VERSIONED \
+ |MD_FEATURE_JOURNAL \
)
/* return how many bytes are needed for bitmap, for cluster-md each node
@@ -484,6 +486,8 @@ static void examine_super1(struct supertype *st, char *homehost)
role = MD_DISK_ROLE_SPARE;
if (role >= MD_DISK_ROLE_FAULTY)
printf("spare\n");
+ else if (role == MD_DISK_ROLE_JOURNAL)
+ printf("Journal\n");
else if (sb->feature_map & __cpu_to_le32(MD_FEATURE_REPLACEMENT))
printf("Replacement device %d\n", role);
else
@@ -995,6 +999,11 @@ static void getinfo_super1(struct supertype *st, struct mdinfo *info, char *map)
case MD_DISK_ROLE_FAULTY:
info->disk.state = 1; /* faulty */
break;
+ case MD_DISK_ROLE_JOURNAL:
+ info->disk.state = (1 << MD_DISK_JOURNAL);
+ info->disk.raid_disk = role;
+ info->space_after = (misc->device_size - info->data_offset) % 8; /* journal uses all 4kB blocks*/
+ break;
default:
info->disk.state = 6; /* active and in sync */
info->disk.raid_disk = role;
--
2.4.6
--
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