需要挂接9T多的磁盘做数据磁盘，记录下操作过程

1、使用fdisk -l识别到磁盘

# fdisk -l|grep '9.5 TiB'
Disk /dev/sdd: 9.5 TiB, 10453950398464 bytes, 20417871872 sectors
Disk /dev/sdf: 9.5 TiB, 10453950398464 bytes, 20417871872 sectors
Disk /dev/sdh: 9.5 TiB, 10453950398464 bytes, 20417871872 sectors
Disk /dev/sdj: 9.5 TiB, 10453950398464 bytes, 20417871872 sectors

2、找到wwid

#  for i in `cat /proc/partitions |awk {'print $4'} |grep sd`; do echo "Device: $i WWID: `/usr/lib/udev/scsi_id --page=0x83 --whitelisted --device=/dev/$i` "; done |sort -k4

Device: sdd WWID: 3600b3420895596a656d4185f1e000055
Device: sdf WWID: 3600b3420895596a656d4185f1e000055
Device: sdh WWID: 3600b3420895596a656d4185f1e000055
Device: sdj WWID: 3600b3420895596a656d4185f1e000055

3、编辑/etc/multipath.conf，添加如下内容

multipaths {
        multipath {
           wwid    3600b3420895596a656d4185f1e000055
           alias    oradata
        }
}

添加后重启服务并查看到磁盘

# systemctl restart multipathd
# multipath -ll
oradata (3600b3420895596a656d4185f1e000055) dm-4 MacroSAN,LU
size=9.5T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=enabled
| |- 15:0:2:1  sdd 8:48  active ready running
| `- 16:0:2:1  sdh 8:112 active ready running
`-+- policy='service-time 0' prio=10 status=enabled
  |- 15:0:3:1  sdf 8:80  active ready running
  `- 16:0:4:1  sdj 8:144 active ready running
 

4、parted分区

# parted /dev/mapper/oradata
GNU Parted 3.2
Using /dev/mapper/oradata
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p                                                                
Error: /dev/mapper/oradata: unrecognised disk label
Model: Linux device-mapper (multipath) (dm)                               
Disk /dev/mapper/oradata: 10.5TB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:
(parted) mklabel gpt                                                      

(parted) p                                                                
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/oradata: 10.5TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start  End  Size  File system  Name  Flags

(parted) mkpart oradata                                                   
File system type?  [ext2]? xfs                                            
Start? 0                                                                  
End? 100%                                                                 
Warning: The resulting partition is not properly aligned for best performance: 34s % 2048s != 0s
Ignore/Cancel? I                                                          
(parted) p                                                                
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/oradata: 10.5TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name     Flags
 1      17.4kB  10.5TB  10.5TB  xfs          oradata

(parted) q                                                                
Information: You may need to update /etc/fstab.

5、格式化并挂接

 mkfs.xfs /dev/mapper/oradata1
meta-data=/dev/mapper/oradata1   isize=512    agcount=10, agsize=268435455 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1    bigtime=0 inobtcount=0
data     =                       bsize=4096   blocks=2552233975, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=521728, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
# blkid |grep oradata1
/dev/mapper/oradata1: UUID="0b1a2a41-02d3-4fed-8009-bcd6c4661116" BLOCK_SIZE="512" TYPE="xfs" PARTLABEL="oradata" PARTUUID="7ba8582f-ca5f-4478-9666-246c48b7c258"

在/etc/fstab中添加一行

UUID=0b1a2a41-02d3-4fed-8009-bcd6c4661116 /oradata                    xfs    defaults        0 0

# mkdir /oradata
# mount -a
# df -h|grep oradata1
/dev/mapper/oradata1  9.6T   68G  9.5T   1% /oradata
 

附：fdisk -l报错(Partition 1 does not start on physical sector boundary.)处理--未验证

获得磁盘的alignment参数-本例是聚合后的磁盘dm-4，根据实际调整
cat /sys/block/dm-4/queue/optimal_io_size  
cat /sys/block/dm-4/alignment_offset
cat /sys/block/dm-4/queue/physical_block_size

 把optimal_io_size的值与alignment_offset的值相加，之后除以 physical_block_size 的值。
在我的例子中是：(0 + 0) / 512 = 0。
这个数值是分区起始的扇区。新的parted命令应该写成类似下面这样：mkpart  0s 100%
0s中的字母s是很有意义的：它告诉parted，你的输入是0扇区，而不是0字节，也不是0兆字节。