总结：
SAN存储的卷可以不是LVM模式情况下，对卷新增容量后，客户端需要重启才可以看到卷对应的磁盘新增后的容量，再对该磁盘执行resize2fs后，该磁盘挂载的分区才可以看到新增后的容量
--确定需要新增容量的磁盘在客户端显示200G，已在存储端新增100G，但是客户端仍然显示200G
[root@mdg /]# fdisk -l |grep /dev/mapper/3600a098038303867635d4a48624e5467
Disk /dev/mapper/3600a098038303867635d4a48624e5467: 214.7 GB, 214748364800 bytes
[root@mdg ~]# df -h |grep /u02test
/dev/mapper/3600a098038303867635d4a48624e5467  197G  216M  187G   1% /u02test
--执行resize2fs命令，磁盘新容量300G，但客户端仍然显示200G
[root@mdg /]# resize2fs -help
resize2fs 1.41.12 (17-May-2010)
Usage: resize2fs [-d debug_flags] [-f] [-F] [-M] [-P] [-p] device [new_size]
[root@mdg /]# resize2fs /dev/mapper/3600a098038303867635d4a48624e5467 300G
resize2fs 1.41.12 (17-May-2010)
The containing partition (or device) is only 52428800 (4k) blocks.
You requested a new size of 78643200 blocks.
[root@mdg /]# fdisk -l |grep /dev/mapper/3600a098038303867635d4a48624e5467
Disk /dev/mapper/3600a098038303867635d4a48624e5467: 214.7 GB, 214748364800 bytes
[root@mdg ~]# df -h |grep /u02test
/dev/mapper/3600a098038303867635d4a48624e5467  197G  216M  187G   1% /u02test
--重启后，磁盘在客户端正常显示300G
[root@mdg /]# reboot
Broadcast message from root@mdg
        (/dev/pts/0) at 14:39 ...
The system is going down for reboot NOW!
[root@mdg /]#
login as: root
root@192.168.8.8's password:
Last login: Wed May 16 14:24:51 2018 from 192.168.1.3
[root@mdg ~]# fdisk -l |grep /dev/mapper/3600a098038303867635d4a48624e5467
Disk /dev/mapper/3600a098038303867635d4a48624e5467: 322.1 GB, 322122547200 bytes
--mount该磁盘，该磁盘已经正常显示300G，但是mount分区仍然显示200G
[root@mdg ~]# mount /dev/mapper/3600a098038303867635d4a48624e5467 /u02test
[root@mdg ~]# df -h |grep /u02test
/dev/mapper/3600a098038303867635d4a48624e5467  197G  216M  187G   1% /u02test
--执行resize2fs命令，磁盘新容量300G，mount分区正常显示300G
[root@mdg ~]# resize2fs /dev/mapper/3600a098038303867635d4a48624e5467 300G
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/3600a098038303867635d4a48624e5467 is mounted on /u02test; on-line resizing required
old desc_blocks = 13, new_desc_blocks = 19
Performing an on-line resize of /dev/mapper/3600a098038303867635d4a48624e5467 to 78643200 (4k) blocks.
The filesystem on /dev/mapper/3600a098038303867635d4a48624e5467 is now 78643200 blocks long.
[root@mdg ~]# df -h |grep /u02test
/dev/mapper/3600a098038303867635d4a48624e5467  296G  220M  281G   1% /u02test
--文件没有丢失，文件没有损坏
[root@mdg ~]# cd /u02test
[root@mdg u02test]# ll
total 29164
-rw-r--r-- 1 root     root           12 May 16 14:10 123
-rw-r--r-- 1 oracle   dba            12 May 16 14:12 123_2
-rw-r----- 1 orahyprd oinstall  3509831 May 16 14:12 alert_HYPRD.log
-rw-r----- 1 oracle   oinstall 26327331 May 16 14:11 alert_MESDB.log
drwx------ 2 root     root        16384 May 16 13:39 lost+found
[root@mdg u02test]# cat 123
efefasdjlj
[root@mdg u02test]# cat 123_2
efefasdjlj
[root@mdg u02test]# less alert_HYD.log
[root@mdg u02test]# less alert_MDB.log
--实验过不停往该分区复制文件，可以使用到296G，说明新增容量有效

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