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Questions tagged [iscsi]

iSCSI is a protocol to exchange SCSI commands over TCP/IP and by so doing makes it possible to manage storage devices over the network.

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iSCSI discovery problem

I have a lab with 3 VM's. Two nodes (centos-1, centos-2) Linux cluster running Centos7 with iSCSI target machine (iSCSI) also on Centos7. After setting up iSCSI storage on iSCSI machine and creating a ...
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Configuring iSCSI targets [closed]

I seem to be a bit stuck on an issue regarding iSCSI and was wondering if anyone could offer some advice. I've got a VM in vSphere of Debian 8.10 Jessie running that we utilize for a FOG imaging ...
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43 views

iscsi Disk not showing up in /dev/disk/by-path

I was able to successfully log into an ISCSI target by command command:sudo iscsiadm --mode node --targetname iqn.2010-06.com.XXXX-a215 --portal 10.X.X.X:3260, 1 --login output: ...
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1answer
44 views

centos 7.5 attempting to create vm using kickstart and get error cannot find /etc./iscsi/initiatorname.iscsi file

I'm using the command: sudo virt-install --name tester1.example.com --ram 2048 --disk path=/var/lib/libvirt/images/tester1.example.com.qcow2,format=qcow2,size=12 --location=ftp://192.168.1.88/pub/...
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16 views

ISCSI and FCOE concepts and difference between them

I am very confused with iscsi and fcoe. I read about iscsi in different posts but don't know about fcoe.Could you please help me in understanding that and the difference between both ?
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23 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 ...
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1answer
27 views

Understanding USB message logs to troubleshoot USB automounting

I am trying to troubleshoot an issue where on one server my USB automounts whereas on another server it isn't. Comparing the logs for both instances, I am trying to understand what each line means. ...
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1answer
48 views

iscsi target screwup - remapping targets and block devices

We've been running a CentOS 7 server successfully for a couple months with two iSCSI targets, all set up using targetcli. These are mounted from a Windows 7 box using the MS iSCSI Initiator. Worked ...
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128 views

How to set up a GFS2 drive to store virtual machines

I want to set up two VM servers (using libvirt with CentOS 7) which share the same iSCSI disk. I started investigating and deduced I had to set up a cluster with pacemaker and GFS2. When I finally got ...
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24 views

GFS2 single writer multiple readers setup

I'd like your advice on a setup I'm implementing in order to allow multiple hosts to share occasionally varying data on shared iSCSI storage. I'm using GFS2 to share access to an LVM2 logical volume ...
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36 views

iSCSI Initiator Boot Waiting Time

I run two CentOS 7 systems for an iSCSI target - initiator pair. The initiator is able to login to the target and connect to the iSCSI block device. No entry has been added to the /etc/fstab yet. ...
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1answer
61 views

Block session with iscsiadm & multipath

I have a cluster of CentOS servers that all connect to NAS devices via iSCSI. The most recent NAS I need to add is a LenovoEMC px4-400r. On this Lenovo NAS, when iSCSI is enabled, it is enabled on all ...
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16 views

target CLI options

I am setting up target/initiator nodes. I come across open-iscsi, tgtadm, tgt-admin, tgt-setup-lun etc command tools.Is there a list that explains technologies and tools for target/initiator setup? ...
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96 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 ...
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189 views

How to combine local and iscsi disk in multipath?

I use two Ubuntu 16.04.03 under VirtualBox environment to test the possibility of local + iSCSI exported disk multipathing (e.g. to make multipath redirect IO in case one SAS cable is broken). I have ...
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20 views

iscsi discovery issue

I have setup an iSCSI server on CentOS 7 and client is also CentOS 7. I have successfully created a lun and also accessed it on client machine. Now when I create a new lun to be shared with same ...
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14 views

Problem creating cluster on RHEL 6.8: inverted partitions

I have built a 2 nodes HA cluster on RH6.8 that use OpenFiler to create 2 simple partitions for quorum and data (connected to the nodes via iscsi). I am using a gfs2 filesystem on both. I have a ...
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95 views

Use from multiple sessions of iSCSI

I have set the configuration file of iSCSI to attempt login at startup. The system creates two session with two different targets. How can I format and mount a particular node using the existing ...
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430 views

Auto mount iscsi device on system start (Ubuntu)

I want to auto-mount /dev/sda1 (iscsi device) to /iscsi2 on system start so I added the following line to /etc/fstab: UUID=d159d371-379f-4730-a832-0fad31fd3ff6 /iscsi2 ext4 auto,...
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141 views

How to configure iscsi offloading on centos 7

Could someone explain how to configure iscsi offloading on Centos7. We have this nic card Hewlett-Packard Company FlexFabric 10Gb 2-port 533FLR-T Adapter, it's based upon Broadcom Limited NetXtreme ...
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51 views

How to fix the error “make sure the kernel module is loaded”?

I am trying to setup a iSCSI envrionment on Xubuntu with iSCSI Enterprise Target. I choose this impelmentation because I need the iSCSI redirection feature. First, I installed below 2 pacakges: Then ...
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40 views

How to tell the protocol/type of storage drives?

I'm sorry if this is question is badly formed -- I am really struggling with the topic of storage devices. Say I log into a random linux machine. It has several attached drives listed in df -h. I ...
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1answer
1k views

Set up two separate LUNs on same iSCSI target for two different initiators

I'm trying to setup my iSCSI server using targetcli. Initial setup went fine and my Windows iSCSI initiator can connect to my first target / portal / LUN. Now I'm trying to setup another LUN. I want ...
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1answer
167 views

Install CentOS 7 without any local disk?

If we only got disks from iSCSI (additionally multipath) and no local disks, how can we install a CentOS 7 on them?
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1answer
260 views

Small boot drive and an iSCSI primary volume

Sorry if this seems trivial, but it's not for me, so here's the question: I have a main storage / iSCSI server where I want to keep all my data. On the other side I have workstations and VMs where ...
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1answer
89 views

Freenas iscsi to VMware - Mount newly created disk to Ubuntu

We've installed Freenas with 4 WD RED drives. We have successfully enabled and configured the iscsi service for one of the disks. On the other hand, vmware has succesfully created the iscsi adapter, ...
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1answer
109 views

after update targetd and rtslib clients could not connect anymore

update of targetcli and python-rtslib changed attribute optimal_sector to 512 and removed attribute fabric_max_sectors from the config. target is running, listening on port 3260 but clients (Windows)...
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1answer
143 views

sharing a drive over the network

I want to share a drive over the Local Area Network so that I can use it for building system images (my machine itself doesn't have that much storage and I'd prefer to use a drive over the network ...
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1answer
81 views

Is there disk-level caching in Solaris 11?

I have an iSCSI disk at /dev/rdsk/c5t6d0 I have made a partition (slice with UEFI label) at: /dev/rdsk/c5t6d0s0 Now I write some data to the slice: echo "...
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1answer
281 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 ...
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1answer
152 views

Lost config targetcli

I have a disc with data and lost targetcli configuration. The disk.img exists and has a 900 GB size but I do not have the saveconfig.json configuration file. How to recover or extract the data from ...
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1answer
484 views

Is the iSCSI block device having client side-read cache (if yes how to disable)?

I have a remote block device with the test ext4 filesystem image. On the iSCSI initiator side, I have this device detected as let's say /dev/sdb. I am not mounting this filesystem but instead I use ...
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1answer
340 views

List connected clients to an iscsi target

Is there any way to list the connected clients to an ISCSI target from another client. While sitting on the target itself , it may be easier to see which clients have mounted a particular target , ...
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1answer
850 views

SCSI disk not shown up during Rhel7 OS installation

In my system, I configured my SCSI disk and tried to install Rhel7 Beta2 OS on it. But for installation, I can't see the SCSI disk. If I'm trying to install other OS I can see the SCSI disk. I don't ...
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2answers
253 views

what iscsiadm actually does?

OK, here im talking about centos7 system related iscsi initiator. When we setup correct iscsi configurations on the files of; /etc/iscsi/initiatorname.iscsia, /etc/iscsi/iscsid.conf we still required ...
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1answer
358 views

Linux: root filesystem via network (with authentication)

I try to create a linux computer which loads its root filesystem from the network. This currently works with NFS, but unfortunately it is not very secure. The network is just a home network, which ...
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1answer
2k views

tgt daemon not working properly

bl_root@bL:~$ service tgt status tgt start/running, process 1544 bl_root@bL:~$ tgtadm --lld iscsi --op show --mode target tgtadm: failed to send request hdr to ...
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1answer
169 views

How can you remote boot over InfiniBand?

If I have InfiniBand adapters in two computers, an InfiniBand cable between them, and all of my hard drives in one of the computers running the necessary host software (iSCSI/SRP/etc), how would the ...
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2answers
3k views

iscsi vs iscsid services

From ISCSI clients, we execute # systemctl start iscsi. However, i can see there is another service called iscsid. Can anybody explain about iscsi service vs iscsid service in rhel7.?
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5answers
3k views

Unable to access iSCSI target since Targetcli has been updated on Centos 7

Targetcli is able to run [root@controller ~]# targetcli targetcli shell version 2.1.fb34 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. /> exit Global pref ...
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2answers
23k views

iSCSI login failed with error 24 - Could not log in to all portals

I am trying to set up a iSCSI target: [root@localhost /]# targetcli targetcli shell version 2.1.fb37 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. /> cd ...
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0answers
34 views

Getting some unwanted message in linux os

When Linux (RHEL) OS is booted I am getting a message as beiscsi_ep_connect shost is null What does it mean?
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1answer
200 views

What are the commands to discover lun disks [closed]

What are the commands to discover LUN disks in linux and esxi?
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2answers
325 views

Fault-tolerant iSCSI root fs for Linux

I am in the process of moving some Linux servers onto a virtualized environment with their filesystems mounted from LVM volumes, which are in turn hosted on a remote NAS via iSCSI. I am able to start ...
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1answer
14k views

Mount iscsi drive at boot - system halts

I am running Oracle Linux 7 (CentOS / RedHat based distro) in a VirtualBox VM on a Mac with OS X 10.10. I have a Synology Diskstation serving as an iscsi target. I have successfully connected to the ...
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0answers
219 views

PXE Boot iSCSI wait time

I am deploying a single Laptop via PXE boot over a wired network. It runs perfectly, DHCP connects, TFTP finds and loads config data, scsi sends over the boot partition. Then it pauses for a minute ...
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1answer
640 views

nova volume-detach fails silently, compute log shows libvirtError: invalid argument: no target device vdb

Using Openstack Havana, I'm trying to detach a cinder volume from a nova instance. Nova volume-list shows it as in-use: | 34b0ea26-f85c-4b62-8ebd-884b0e63e2d5 | in-use | filestore | 256 | None| ...
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1answer
672 views

iscsi won't start at boot

I am trying to configure iscsi initiator. Everything works accept it won't start at boot. It times out. Once system is up, I am able to manually mount the drive and /etc/init.d/iscsi status says its ...
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0answers
238 views

XFS over iSCSI share with cluster; will fencing cause data corruption/loss?

When using XFS on iSCSI share, where HA is enabled, nodes may be fenced by cluster. Will this result in data loss / corruption / etc. ?
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322 views

Pacemaker and iSCSi

I currently am trying to make a highly available NAS under debian 7. I am using following packages: drbd8-utils iscsitarget iscsitarget-dkms pacemaker corosync openais ...