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| author | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2014-10-29 18:51:31 -0500 |
|---|---|---|
| committer | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2015-02-23 09:59:07 -0600 |
| commit | 1aee41f637694d4bbf91c24195f2b63e3f6badd2 (patch) | |
| tree | b6f532e5a4265193dd5ebc547a0ab9f772143762 /include/uapi/linux/raid/md_p.h | |
| parent | 7d49ffcfa3cc08aa2301bf3fdb1e423a3fd33ee7 (diff) | |
| download | talos-obmc-linux-1aee41f637694d4bbf91c24195f2b63e3f6badd2.tar.gz talos-obmc-linux-1aee41f637694d4bbf91c24195f2b63e3f6badd2.zip | |
Add new disk to clustered array
Algorithm:
1. Node 1 issues mdadm --manage /dev/mdX --add /dev/sdYY which issues
ioctl(ADD_NEW_DISC with disc.state set to MD_DISK_CLUSTER_ADD)
2. Node 1 sends NEWDISK with uuid and slot number
3. Other nodes issue kobject_uevent_env with uuid and slot number
(Steps 4,5 could be a udev rule)
4. In userspace, the node searches for the disk, perhaps
using blkid -t SUB_UUID=""
5. Other nodes issue either of the following depending on whether the disk
was found:
ioctl(ADD_NEW_DISK with disc.state set to MD_DISK_CANDIDATE and
disc.number set to slot number)
ioctl(CLUSTERED_DISK_NACK)
6. Other nodes drop lock on no-new-devs (CR) if device is found
7. Node 1 attempts EX lock on no-new-devs
8. If node 1 gets the lock, it sends METADATA_UPDATED after unmarking the disk
as SpareLocal
9. If not (get no-new-dev lock), it fails the operation and sends METADATA_UPDATED
10. Other nodes understand if the device is added or not by reading the superblock again after receiving the METADATA_UPDATED message.
Signed-off-by: Lidong Zhong <lzhong@suse.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Diffstat (limited to 'include/uapi/linux/raid/md_p.h')
| -rw-r--r-- | include/uapi/linux/raid/md_p.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h index 643489d33e68..2ae6131e69a5 100644 --- a/include/uapi/linux/raid/md_p.h +++ b/include/uapi/linux/raid/md_p.h @@ -78,6 +78,12 @@ #define MD_DISK_ACTIVE 1 /* disk is running or spare disk */ #define MD_DISK_SYNC 2 /* disk is in sync with the raid set */ #define MD_DISK_REMOVED 3 /* disk is in sync with the raid set */ +#define MD_DISK_CLUSTER_ADD 4 /* Initiate a disk add across the cluster + * For clustered enviroments only. + */ +#define MD_DISK_CANDIDATE 5 /* disk is added as spare (local) until confirmed + * For clustered enviroments only. + */ #define MD_DISK_WRITEMOSTLY 9 /* disk is "write-mostly" is RAID1 config. * read requests will only be sent here in |
