GPFS如何在线添加和删除磁盘
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一、在线加盘
1、查看当前NSD磁盘
dbfc:/tmp # mmlsnsd -m
Disk name NSD volume ID Device Node name Remarks
---------------------------------------------------------------------------------------
gpfs1nsd 0AC8016258A2CCC4 /dev/sdc dbfc.example.com
gpfs2nsd 0AC8016258A2CCF2 /dev/sdd dbfc.example.com
gpfs3nsd 0AC8016258A2CD1B /dev/sde dbfc.example.com
gpfs4nsd 0AC8016258A3AF5D /dev/sdf dbfc.example.com
dbfc:/tmp # mmlsnsd
File system Disk name NSD servers
---------------------------------------------------------------------------
db2arch gpfs4nsd (directly attached)
db2data gpfs2nsd (directly attached)
db2inst gpfs1nsd (directly attached)
db2log gpfs3nsd (directly attached)
2、编辑NSD配置文件
vi /tmp/nsdprofile
sdg:::dataAndMetadata::
3、创建NSD盘
dbfc:/tmp # mmcrnsd -F /tmp/nsdprofile
mmcrnsd: Processing disk sdg
mmcrnsd: Propagating the cluster configuration data to all
affected nodes. This is an asynchronous process.
4、确认创建情况
dbfc:/tmp # mmlsnsd
File system Disk name NSD servers
---------------------------------------------------------------------------
db2arch gpfs4nsd (directly attached)
db2data gpfs2nsd (directly attached)
db2inst gpfs1nsd (directly attached)
db2log gpfs3nsd (directly attached)
(free disk) gpfs5nsd (directly attached)
dbfc:/tmp # mmlsnsd -m
Disk name NSD volume ID Device Node name Remarks
---------------------------------------------------------------------------------------
gpfs1nsd 0AC8016258A2CCC4 /dev/sdc dbfc.example.com
gpfs2nsd 0AC8016258A2CCF2 /dev/sdd dbfc.example.com
gpfs3nsd 0AC8016258A2CD1B /dev/sde dbfc.example.com
gpfs4nsd 0AC8016258A3AF5D /dev/sdf dbfc.example.com
dbfc:/tmp # mmlsdisk db2data
disk driver sector failure holds holds storage
name type size group metadata data status availability pool
------------ -------- ------ ----------- -------- ----- ------------- ------------ ------------
gpfs2nsd nsd 512 -1 yes yes ready up system
gpfs5nsd nsd 512 -1 yes yes ready up system
5、将新建的NSD盘添加到GPFS集群
dbfc:/tmp # cat /tmp/nsdprofile
# sdg:::dataAndMetadata::
gpfs5nsd:::dataAndMetadata:-1::system
dbfc:/tmp # mmadddisk db2data -F /tmp/nsdprofile
The following disks of db2data will be formatted on node dbfc:
gpfs5nsd: size 10240 MB
Extending Allocation Map
Checking Allocation Map for storage pool system
Completed adding disks to file system db2data.
mmadddisk: Propagating the cluster configuration data to all
affected nodes. This is an asynchronous process.
6、确认扩容结果
异步同步，所以需要登录所有节点检查
df -h
dbnode02:~ # mmlsnsd
File system Disk name NSD servers
---------------------------------------------------------------------------
db2arch gpfs4nsd (directly attached)
db2data gpfs2nsd (directly attached)
db2data gpfs5nsd (directly attached)
db2inst gpfs1nsd (directly attached)
db2log gpfs3nsd (directly attached)
二、 rebalance文件系统
dbfc:/tmp # mmrestripefs db2data -b
Scanning file system metadata, phase 1 ...
Scan completed successfully.
Scanning file system metadata, phase 2 ...
Scan completed successfully.
Scanning file system metadata, phase 3 ...
Scan completed successfully.
Scanning file system metadata, phase 4 ...
Scan completed successfully.
Scanning user file metadata ...
100.00 % complete on Thu Apr 13 16:44:28 2017 ( 133376 inodes with total 1969 MB data processed)
Scan completed successfully.
三、 动态减盘
dbfc:/tmp # mmrestripefs db2data -b
Scanning file system metadata, phase 1 ...
Scan completed successfully.
Scanning file system metadata, phase 2 ...
Scan completed successfully.
Scanning file system metadata, phase 3 ...
Scan completed successfully.
Scanning file system metadata, phase 4 ...
Scan completed successfully.
Scanning user file metadata ...
100.00 % complete on Thu Apr 13 16:44:28 2017 ( 133376 inodes with total 1969 MB data processed)
Scan completed successfully.
dbfc:/tmp # mmlsnsd
File system Disk name NSD servers
---------------------------------------------------------------------------
db2arch gpfs4nsd (directly attached)
db2data gpfs2nsd (directly attached)
db2data gpfs5nsd (directly attached)
db2inst gpfs1nsd (directly attached)
db2log gpfs3nsd (directly attached)
dbfc:/tmp # mmdeldisk db2data gpfs2nsd
Deleting disks ...
Scanning file system metadata, phase 1 ...
73 % complete on Thu Apr 13 16:51:18 2017
100 % complete on Thu Apr 13 16:51:19 2017
Scan completed successfully.
Scanning file system metadata, phase 2 ...
Scan completed successfully.
Scanning file system metadata, phase 3 ...
Scan completed successfully.
Scanning file system metadata, phase 4 ...
Scan completed successfully.
Scanning user file metadata ...
100.00 % complete on Thu Apr 13 16:51:28 2017 ( 133376 inodes with total 1969 MB data processed)
Scan completed successfully.
Checking Allocation Map for storage pool system
Attention: A disk being removed reduces the number of failure groups to 1,
which is below the number required for replication: 2.
New blocks will be allocated from the remaining disks,
but files will be unreplicated and hence at risk.
tsdeldisk completed.
mmdeldisk: Propagating the cluster configuration data to all
affected nodes. This is an asynchronous process.
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文章题目：GPFS如何在线添加和删除磁盘
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