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linux:cmd:fclun [2016/02/19 15:57] – angelegt jslinux:cmd:fclun [2022/07/29 13:05] (current) – [multipath] js
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 ====== use lun storage ====== ====== use lun storage ======
  
-  - scan luns +=== multipathd === 
-    - look for fc hosts<code bash>ls /sys/class/fc_host +     - first install multipathd <code bash>yum install device-mapper-multipath</code> 
-host0  host1</code> +     - copy multipath.conf in /etc or use multipath -t >/etc/multipath.conf 
-    - install rescan script <code bash>yum install sg3_utils</code> +     - restart multipathd <code bash>service multipathd restart</code>
-    - to rescan luns <code bash>rescan-scsi-bus.sh</code>or <code bash>echo "1" > /sys/class/fc_host/host0/issue_lip +
-echo "- - -" > /sys/class/scsi_host/host0/scan</code> for all hosts +
-  - multipath(d)+
      - alias in multipath.conf <code>multipaths {      - alias in multipath.conf <code>multipaths {
     multipath {     multipath {
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 }</code> }</code>
      - reload multipathd <code bash>service multipathd reload</code>       - reload multipathd <code bash>service multipathd reload</code> 
 +     - multipathd on startup <code bash>chkconfig multipathd on</code>
 +
 +=== scan luns ===
 +    - look for fc hosts<code bash>ls /sys/class/fc_host</code> e.g. you get two: host0  host1
 +    - install rescan script <code bash>yum install sg3_utils</code>
 +    - to rescan luns <code bash>rescan-scsi-bus.sh</code>or <code bash>echo "1" > /sys/class/fc_host/host0/issue_lip
 +echo "- - -" > /sys/class/scsi_host/host0/scan</code> for all hosts you find (hba controller)
 +
 +=== multipath ===
 +    - show <code bash>multipath -ll</code> e.g. you get following output <code>fsilun (360000970000296800677533030303638) dm-1 EMC,SYMMETRIX
 +size=1000G features='1 queue_if_no_path' hwhandler='0' wp=rw
 +`-+- policy='round-robin 0' prio=1 status=active
 +  |- 1:0:1:1 sdd 8:48 active ready running
 +  |- 2:0:1:1 sdf 8:80 active ready running
 +  |- 1:0:0:1 sdc 8:32 active ready running
 +  `- 2:0:0:1 sde 8:64 active ready running</code>
 +  
 +<WRAP center round box 90%>
 +Example:
 +  
 +A server node with 2 * fibre channel HBAs attached to a storage controller with 2 ports sees 4 devices: 
 +/dev/sda, /dev/sdb, dev/sdc, and /dev/sdd.
 + 
 +Device Mapper (DM) Multipath creates a single device with a unique World Wide Identifier (WWID) that reroutes I/O to those four underlying devices according to the multipath configuration.
 +
 +</WRAP>
 +
 +
 +=== device mapper ===
 +      - create block device in /dev/mapper with fsilun as name
 +      - wipe to create new fresh physical volume <code bash>dd if=/dev/zero of=/dev/mapper/fsilun bs=512 count=1</code>
 +=== lvm ===
 +      - create physical volume <code bash>pvcreate /dev/mapper/fsilun</code> <code>File descriptor 7 (pipe:[13154434]) leaked on pvcreate invocation. Parent PID 3865: bash
 +  Physical volume "/dev/mapper/fsilun" successfully created</code>
 +         * show pyhsical volume <code bash>pvdisplay</code>
 +      - wipe sector, so the lun is clean <code bash>dd if=/dev/zero of=/dev/mapper/fsilun bs=512 count=1</code><code>1+0 records in
 +1+0 records out
 +512 bytes (512 B) copied, 0.000873947 s, 586 kB/s</code>
 +      - create volume group <code bash>vgcreate fsilun /dev/mapper/fsilun</code><code>File descriptor 7 (pipe:[13154434]) leaked on pvcreate invocation. Parent PID 3865: bash
 +  Physical volume "/dev/mapper/fsilun" successfully created</code>
 +         * show volume group <code bash>vgdisplay</code>
 +      - create logical volume (-L <size in PE see above) <code bash>lvcreate -L 256000 -n lvfsilun fsilun</code><code>File descriptor 7 (pipe:[13154434]) leaked on lvcreate invocation. Parent PID 3865: bash
 +  Logical volume "lvfsilun" created.</code>
 +         * show logical volume <code bash>lvdisplay</code>
 +=== format filesystem ===
 +      - create ext4 filesystem <code bash>mkfs.ext4 /dev/fsilun/lvfsilun</code><code>mke2fs 1.41.12 (17-May-2010)
 +Discarding device blocks: done
 +Filesystem label=
 +OS type: Linux
 +Block size=4096 (log=2)
 +Fragment size=4096 (log=2)
 +Stride=0 blocks, Stripe width=0 blocks
 +16384000 inodes, 65536000 blocks
 +3276800 blocks (5.00%) reserved for the super user
 +First data block=0
 +Maximum filesystem blocks=4294967296
 +2000 block groups
 +32768 blocks per group, 32768 fragments per group
 +8192 inodes per group
 +Superblock backups stored on blocks:
 +        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
 +        4096000, 7962624, 11239424, 20480000, 23887872
 +Writing inode tables: done
 +Creating journal (32768 blocks): done
 +Writing superblocks and filesystem accounting information: done
 +This filesystem will be automatically checked every 34 mounts or
 +180 days, whichever comes first.  Use tune2fs -c or -i to override.</code>
 +=== mount ===
 +      - create mount dir <code bash>mkdir /mnt/fsilun</code>
 +      - mount <code bash>mount -t ext4 /dev/fsilun/lvfsilun /mnt/fsilun/</code>

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