Questions tagged [multipath-storage]

The tag has no usage guidance.

15 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
4
votes
0answers
101 views

What identifier is used by multipath to determine the same block devices?

In my application I want to multipath different devices, both local and iSCSI or FC exported. However, I fail to google the documentation that would clearly explain the mechanism of decision that ...
2
votes
0answers
43 views

Multipath — Ignoring internal disks

I want to configure multipath such that it ignores all the internal disks and only sees SAN Luns. Any idea how can I achieve that? Basically I want to filter out all the internal disks like IDE, SAS ...
2
votes
0answers
692 views

Unable to resize filesystem on multipath device

I've encountered an issue with multipath storage. I've resized a LUN and have rescanned the system to account for it. Multipath recognizes the new size. Before rescan: mpathax (...
2
votes
1answer
357 views

Difference between multipath -ll command and multipath -l command

From the multipath man page http://linux.die.net/man/8/multipath multipath -l shows the current multipath topology from information fetched in sysfs and the device mapper while multipath -ll shows ...
1
vote
0answers
48 views

How to explain the different behavior of multipath -ll with the same write-protected disks ?

The following disks with write-protected for DR usage in RHEL 5.5 have some strange phenomena with the multipath -ll ! 1) Why sometimes the output takes abnormally longer time, versus sometimes ...
1
vote
0answers
10 views

How to ensure if multipath discovery is complete?

On my machine, the multipath discovery takes random amount of time to discover and map all the disks under /dev/mapper directory. The number of disks to be discovered is not constant. How to ensure ...
1
vote
0answers
43 views

multipath equivalent that doesn't require root privilege

Is there any native tool that can show multipath topology but doesn't need root privileges? Basically the same output as multipath -ll
1
vote
0answers
75 views

Why does the node (multipathed with boot drive on mpatha) require both the TGT servers to boot up and not anyone of them

This is what I have done I have a VM which contains: A Ceph client A TGT server DHCP server the machine exposes the image (RHEL) present in Ceph and PXE boots the remote node (which is the ...
1
vote
0answers
113 views

multipath default grouping policy not observed?

RHEL 6.4, Yes I know it's old. I have no choice. According to the multipath.conf man page, the default grouping policy is multibus. That is, multipaths should be shown as follows: # multipath -ll ...
0
votes
0answers
29 views

multipathd checker failed

There are 2 LUNs from different storage (HITACHI, HP MSA 2040) to my server (HP DL380 G9). and I 'JUST' got this error every day on my LUN that presented from HP storage and on my same PATH (Just on ...
0
votes
0answers
33 views

Extending a multipath'd /dev/mapper device that isn't listed as an LVM anywhere

RHEL 5. I have a host that uses an EQL array for storage with multipath on the OS. I'm trying to extend the disk: /dev/mapper/prdbkpp1 1.3T 1.3T 20G 99% /backup I rescanned and resized via ...
0
votes
0answers
25 views

lsblk output changes after while

I have systems which lots of different LUNs are attached them (OS CentOs 6). this command lsblk helps me alot to find out how LUNs are partitioned and are mounted to which filesystem and information ...
0
votes
1answer
722 views

Dealing with Device-Mapper (Multipath) Failing paths

When a disk starts to die slowly multipath starts to Failing & Reinstating paths and this keeps forever.. (I'm using LSI-3008HBA card with SAS-JBOD not FC-Network) Dmesg; Sep 13 11:20:17 DEV2 ...
0
votes
1answer
190 views

Multipathd config for LSI HBA 3008

I have 5 jbod attached via LSI-SAS3008 to controller. I'm using Arch-Linux 4.14.41-1-lts & multipath-tools v0.7.6 (03/10,2018) My problem is when a disk starts to give I/O error and starts to ...
0
votes
2answers
618 views

Can't mount a multipath LUN

I'm trying to mount a lun, it's visible in multipath -ll and I can see the multiple access to it with lsblk. I know screw up somewhere along the line because sda isn't visibly mounted in lsblk anymore ...