Configure Multipath In Redhat Enterprise Linux Server 7 | Native Maltipathing | RHEL 7 |CentOS7

[@abhijitaich2595]

Its been 5 years I'm still loves your videos

[@tunetolinux4173]

Thank you 🙏

[@shahbuddinmalek6534]

Hi this is very informational video, in my case i have shown in rhel 7.9 two disk like sda and sdb with multipath connectivity with san storage so which disk mount and how to mount disk and partition I request to you make specials video on this topic

[@nullumcorpus5621]

Wonder if when you re-enabled .32, you need to do a rescan, either by running "multipath -r" . Also, as for why the 3rd path magically reappeared, I wonder if that was because your poll setting is set to 10 minutes and that time has elapsed during your troubleshooting. I realize this is an old topic.

[@funtimetamil3441]

Understood better , thank you sir

[@tunetolinux4173]

Happy to hear that. Thanks 🙏

[@balaji276]

Thanks for the video

[@shanu1990husain]

Thanks! Sir nice video... one question: do we need to use data and ORA as PV now.. like: pvcreate data and pvcreate ORA then that will be added

[@tunetolinux4173]

If you use for ASM disk, pvcreate is not require else you have to do.

[@shanu1990husain]

Thanks sir pvcreate data vgextend myvg data Is above command is OK to create pv and to add pv in vg..?

[@tunetolinux4173]

Your disk would be under /dev. Check with command $lsblk or $pvs -a -o +dev_size. Identify the disk and run $pvcreate /dev/xxx to create pv. Note xxx is your disk name. Once you done with pv, now create vg $vgcreate (vgname) (pvnane)

[@satpad]

Thank You

[@tunetolinux4173]

Thank you 😊

[@braylonclark5352]

I think the problem with the network devices was that you did not change the UUID of the two new devices. Do you think that could have caused this issue?

[@jeezusjuice344]

He had the file name wrong, and he had the device name wrong within the file name. He should have either changed the ifnames, or changed the file name because it’s confusing as fuck to have ifcfg files that don’t match the ifnames.

[@jeezusjuice344]

Of course, he eventually changed the dev name in the file, which resolved his issues. Changing UUID may also have done that for him. It’s generally easier to use tools that write the conf files for you. If I make a file, I generally write them from scratch so I don’t have these annoying snags. It’s very simple. A lot of the directives you see in system-generated files are not required to make an interface work. Some of them are just explicitly stated defaults.

[@hemkumar2761]

you have given very informative details. I have one question on this. if we are using disk and it will show failed state. so communication will be broken and we can't able to access that disk i.e sdb. to avoid that we use multipath and using multipath name we can avoid this kind of communication error if one disk (sdb) fails. I request you to provide that info. it will be very helpful.

[@tunetolinux4173]

+Hem Kumar Multipath uses for accessing disk with more than one path. This is for redundant purpose. Example when not using mutipath for disk sdb. It will inaccessible with various reasons when situation of faulty cable, faulty febric switch port, faulty HBA port or faulty SP from storage end. To avoid that we two of everything- dual SP, dual fabric, Dual HBA port and multipath from OS end. To avoid single point of failure and have redundant. Hope this answer your question.

[@hemkumar2761]

OK, but now question comes with which device we need to configure LVM, let's suppose: three devices are coming sdb,sdc,sdd all three are the same disk but visible three and if I chosen sdb for LVM purpose and some how it got failed than as per my understanding this will break the communication. sdc and sdd will be visible but in my case I haven't configured them (sdc and sdd) for LVM. ?

[@them0clones]

not sure if i understood your Q correctly but if the disk fails (and RAID is not configured) then i don't think multipath can help you, multipath as the name suggests provides different path to the same LUN(disk).

[@armypreparation7300]

Nice tutorial brother .. Ur new subscriber

[@tunetolinux4173]

Thanks 🙏

[@tamilkumarannamalai5545]

Superb bro😃

[@tunetolinux4173]

Thanks 🙏

[@abdulraheems6828]

thanks for the video if we have 18 disks like sda,sdb,sdc....and iscsi is not configured but hard disk will be available to server due to storage is directly attached to server through hba card then what is the process for mutipath and how to create partition

[@tunetolinux4173]

You have to scan with #echo “1”>/sys/class/fc_host/hostX/issue_lip command. Where HostX is your host port number and rest procedures is same as given in this video.

[@agh0x01]

@31:00 the 34:0:0:0 was already showing as "failed faulty" before you shut down the interface on the server.

[@abdulraheems6828]

Thanks sir

[@prabodhpalve5930]

Which installation you have done. I installed minimal installation but I am neither able to copy and paste nor able to select the command.i also want to do same installation which you have done.

[@НиколайДженков-у7б]

He's using putty, that's why he's able to copy/paste.

[@ddenky]

Hi, Storage team added a LUN /dev/sdv to the server. /dev/sdv --- 0 0 4.00t It has 2 paths. How'd you add this new LUN to multipath already configured on the server to make it a 8TB volume?

[@tunetolinux4173]

Mutlipath is nothing but multiple path accessing your storage. Incase one lost connectivity other is still active. It would not double your disk size.

[@satyad6974]

Can you create a video on udev Rhel 7

[@venkateshk8709]

Please share video link of how to allocate Lun for Iscsi initiator (Previous video Link)

[@tunetolinux4173]

Here is the link. kzbin.info/www/bejne/fZDQp6OcqppjldE

[@yogeshsingh3028]

thank you tune to linux :)

[@tunetolinux4173]

Thank you. Hope you like it.

[@harshal120]

Are you providing udemy course?

[@tunetolinux4173]

No

[@jeezusjuice344]

Man, you gotta learn to vim better. Shift + 4 ($) takes you to the end of a line. Shift + 6 (^) to the beginning. e brings you to the end of a word, b to the beginning (all in command mode, not insert mode). R to replace strings, r to replace single characters. It’s painful to watch people single letter scroll all the way to the end of a line, then insert and backspace to replace characters.

[@bharatnailwal9795]

We should have used network bonding here for failover, instead of providing multiple ips to each the ethernet ports

[@saumyadip1]

Comeon in fiber switch environment you cant work with bond. Multipath is the only option

[@petersorger5231]

looks like you don't know how to write "multipath".. it's not muttipath nor mutlipath... but multipath

[@tunetolinux4173]

Yes I don’t know and have learned something amazing today. Thank you so much for sharing “professor”.

[@petersorger5231]

@@tunetolinux4173 I didn't mean it in a bad way.