Questions tagged [iscsi]
iSCSI - SCSI over IP - mount disks across the network
164
questions with no upvoted or accepted answers
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answers
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How to enable space reclamation from KVM guest to ZFS zvol iSCSI target?
I have a ZFS volume "tank/kvm/webhosting", exposed through iSCSI (using tgt) to KVM guest.
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native' ...
- 347
4
votes
1
answer
2k
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How to stop iSCSI server?
Is it possible to stop listening on iSCSI server port 3260 without deleting the portal from the configuration? I tried to stop all services I know, but it's still running.
[root@okvmh1 ~]# systemctl ...
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4
votes
0
answers
2k
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XenServer 6.5 iSCSI MPIO with point-to-point links (without a Switch)
I'm doing some experiment with iSCSI MPIO between FreeNAS 9.3 and two XenServer 6.5 hosts. I would like to use iSCSI MPIO to serve as VM storage. Pretty common environment, but without a switch to ...
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4
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0
answers
2k
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Broadcom BCM57810 iSCSI offload performance
Anyone out there doing iSCSI offloading using Broadcom BCM57810 10 gigabit ethernet cards?
My test scenario
Network....
2 x Dell Force 10 S4810 switches
Client....
Dell R620
24 core
128gb memory
...
- 41
4
votes
0
answers
626
views
Windows Server 2012 - Hyper-V - iSCSI SAN - All Hyper-V Guests stops responding and extensive disk read/write
We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN.
Our Problem
Our problem is that for some reason all of the VMs stops ...
- 41
4
votes
0
answers
14k
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iSCSI issue; "the media is write protected"
i've got some serious issues with w2k8 r2 standard and iSCSI controller. i'm running dell server, connected via ethernet to synergy NAS, which is handling LUN via iSCSI. i'm using ms iSCSI initiator ...
- 41
3
votes
1
answer
747
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Booting a SuperMicro from virtual iSCSI CD-ROM
I correctly set up the iSCSI server with SCST, I can login to the target via iscsiadm and mount the iSCSI resource, a CDROM based on ISO image exposed as LUN 0.
When I try to boot a SuperMicro X10DRi-...
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3
votes
0
answers
2k
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The driver detected a controller error on \Device\Harddisk0\DR0 on a virtual machine
The event in question is generated by a virtual machine.
The disk 0 is a scsi connected drive to the virtual machine.
The vhdx file is in the hyper-v cluster which has the storage from SAN cluster. ...
- 31
3
votes
0
answers
354
views
FreeNAS iSCSI use - recommended percentage?
I have set up a FreeNAS system on a Dell R310 server with 4x4TB drives on a cross-flashed H200 controller in FreeNAS' own RAID10. I want to use that storage entirely for VM containers that run on ...
- 41
3
votes
0
answers
366
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Mirroring on external SCSI and iSCSI disks inside same volume group
On IBM P5 505 (maint level 5300-07) servers there is a concurently accessed
external storage, which is connected using external Ultra320 SCSI port (DAS).
External storage is detected as hdisk2 which ...
- 131
3
votes
0
answers
597
views
Maximum transfer rate iSCSI bonding vs multipath
I want to get the maximum tranfer rate with iSCSI from my virtual machine (Linux) to my Linux Storage Host.
I don't know iSCSi well so I'm not sure which way is the best for performance.
A: Just ...
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3
votes
1
answer
266
views
Best practices for migrating to new SAN
My collaborator is splitting from his institute and wants help moving his application and data off the institute's network. And of course things are moving quickly.
He has 12 TB of image data on a ...
- 181
3
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0
answers
289
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Automatically build kernel modules after unattended upgrades in ubuntu
For automatic upgrades I has installed unattended-upgrades package and configured it.
After each unattend kernel upgrade I must run following commands to recompile iscsi kernel modules:
apt-get ...
- 697
3
votes
0
answers
2k
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Trying to boot a diskless server to Windows 2012 using iSCSI and Differencing VHDs
We are in the middle of a big VMware to Hyper-V migration at the moment. Part of this process is going to be changing some of our existing ESXi servers to Hyper-V. These ESXi servers don't have hard ...
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3
votes
1
answer
660
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Is WinSAT reliable to test the speed of my iSCSI, Fibre SAN, under bare metal or Virtualized?
I discovered the following command in this whitepaper:
WinSat disk -read -ran -ransize 4096 -drive c
Is it reliable to use against a SAN, or iSCSI drive? I would like to compare the output of ...
- 8,961
2
votes
0
answers
1k
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Steps to succesfully persistent iSCSI LUN using Open-iSCSI on Ubuntu Server?
Using Ubuntu Linux Server 22.04 minimal edition without GUI, I need some help in mounting the iSCSI LUN using Open-iSCSI so it is mapped to /dev/sdb with the below command:
Could you please let me ...
- 1,305
2
votes
1
answer
407
views
ext4 errors with dm-crypt / LUKS on top of an iSCSI device
I have two oldish "NAS" devices, specifically Buffalo TeraStation Rackmount iSCSI ("TS-RIXL/R5"). Those are basically embedded computers running Linux with four SATA slots and two ...
- 91
2
votes
0
answers
1k
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iPXE sanboot starts slowly with " Did not receive response to NOPIN on CID"
Environment:
- CentOS 7 with kernel 3.10.0-1062.18.1.el7.x86_64
- targetcli version 2.1.fb49
- isc-dhcpd-4.2.5
- iPXE version 1.20.1+ and 1.0.0+
I have a CentOS 7 server which can serve Window ...
- 83
2
votes
0
answers
65
views
I'm getting error during HA configuration for KVM on CentOS
After adding all nodes and resource agents in my cluster I'm getting this error please someone suggest me something. Please take a look in the image-
- 133
2
votes
0
answers
447
views
"Getting devices ready" on Windows 10 while booting VM/iSCSI on another machine than initially set up
TL;DR version:
virtual Windows instance reinstalls GPU drivers while switching to other hosts despite the fact it's getting the same hardware all the time. I'm trying to avoid it / shorten its time
...
- 21
2
votes
0
answers
367
views
Windows 2012 R2 SCSI UNMAP failure
I have a very strange situation. I have a Windows 2012 R2 VM with mounted thin provisioned LUNs located on a NetApp FAS2552 filer (running cDOT 9.4P2), and the server is not sending SCSI UNMAP ...
- 1,368
2
votes
0
answers
594
views
iSCSI Multipath to block device on zfs pool in ubuntu
I have succesfuly set up zfs pool, created block on it , and created iscsi target. The target is visible from esx host and i can us it as datastore.
steps i did:
zpool create tank raidz2 sdb sdc ...
- 321
2
votes
1
answer
2k
views
Cluster Shared Volume Owner Node After reboot
Problem:
In a failover-cluster (Hyper-v) the CSV (iSCSI) gets "pulled" to the node that just restarted (after updates) when i don't want it to.
I can not find any setting defining CSV owner ...
- 21
2
votes
0
answers
121
views
hp p2000 iscsi Hyper-V
I currently have an HP P2000 SAN with 2 MSA with 4 iSCSI ports each. Only 2 iSCSI ports per MSA were utilized. One going to each of our SAN Switches and furthermore to our hosts. Throughput has been ...
- 31
2
votes
0
answers
460
views
Error when backuping to USB disk over iscsi (0x80042556)
I have two Windows Server. First (a) is a W2012 Essentials. Second (b) is a W2012 R2 Standard running on top of XenServer 7.0. I have attached an external USB disk to server a and created a virtual ...
- 487
2
votes
0
answers
451
views
How to emulate or make multiple iSCSI software initiator IQNs on RHEL RedHat 7?
I have 2 Ethernet HBAs with 2 ports each, all 4 ports are connected to iSCSI targets and I can login using iscsiadm command.
But the iSCSI initiator name (IQN) for all 4 ports is one, in /etc/iscsi/...
- 121
2
votes
0
answers
136
views
EMC NS-480 Celerra - Way to verify which iSCSI initiators are currently connected to a LUN?
In the NS-480 or a given Celerra NAS, is there a way to verify which iSCSI initiators are actually CURRENTLY CONNECTED to a given LUN?
I can see how to look at the LUN MASKs in Unisphere and see ...
- 32.8k
2
votes
0
answers
117
views
ISCSI intiator displaying the ISCSI target even after its removal on ISCSI target server
I am running a ISCSI target server on RHEL 6.7 and sharing the storage for the ISCSI initiator server which is running on RHEL 6.5.
I configured the below code in the /etc/tgt/targets.conf file of ...
2
votes
1
answer
1k
views
Access iSCSI block device, setup as ZFS volume on CentOS7 - won't automount on boot, hangs on reboot
I am running CentOS7 on a virtual instance at Softlayer. There is a block storage device available to the instance via multipath/iscsi
I have successfully had this block device mounted as XFS. I ...
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2
votes
0
answers
447
views
How do I add an iscsi target to a windows initiator through stock cmd?
I have many Windows Servers that need to run headless but I need to add many iscsi targets to each of the Windows hosts.
I already have the iscsi target setup and have access to IP address of where ...
- 482
2
votes
2
answers
1k
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iSCSI to NetApp FAS: high latency for write load
Problem
A Linux iSCSI initiator is seeing high service times when writing to a NetApp FAS target exposing a bunch of LUNs. Where to look for the cause and how to resolve this?
Reproduction
I am ...
- 41k
2
votes
0
answers
3k
views
iscsi not working after host reboot
I have a host that is acting as both an iscsi initiator and target. It's an OpenStack box that acts as both the storage node (cinder) and also as a compute node. There is also another compute nodes on ...
- 941
2
votes
0
answers
284
views
iSNS Best Practices
I am looking into deploying an iSNS server to simplify deployment of a new iSCSI infrastructure for a client of mine. I feel that I understand what iSNS does and how to configure it, but I'd like some ...
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2
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0
answers
2k
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How to enable disk cache again after enabling iSCSI in Windows Server 2012?
I create an iSCSI Virtual Disk and a corresponding target. This enables the cache bypass flag on the volume. After I remove the iSCSI disk, the flag doesn't get reset.
Anyone can help me to reset ...
- 141
2
votes
0
answers
1k
views
windows2012 failover cluster + storage. Considerations
We plan to build a failover storage with Windows2012r2. There will be 2 or 3 physical machines with 2 virtual machines on each server. One virtual machine building a failover, second one being storage ...
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2
votes
0
answers
3k
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Volume manager of Windows Server 2008 R2 does not show all iSCSI volumes
We set up a backup server (Windows 2008 r2) for our VMware infrastructure which uses an iSCSI SAN for storage. The backup server has to be connected to the SAN for Veeam to be able to backup virtual ...
- 41
2
votes
1
answer
1k
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iSCSI target rebooting causes initiators to reboot as well
I'm running a couple of iSCSI Targets with OCFS2. I had to reboot my iSCSI Target (the physical iSCSI Target) due to some hardware changes and it caused all the initiators to reboot. I want to prevent ...
- 1,765
2
votes
0
answers
1k
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FreeBSD istgt - how to limit iscsi target discoverability to IP address
How can I setup an ISCSI target that is only visible to a certain IP address? For example, if a client runs iscsiadm discover from 10.1.1.130, I only want target iqn.2011-03.domain.org.istgt.ded130 ...
- 1,689
2
votes
1
answer
1k
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Cluster-Shared Volume on Windows Server 2012 R2 drops off with minor iSCSI pauses
We are running into an issue here where the Cluster-Shared Volume attached to our Hyper-V 2012 R2 cluster is being dropped off / faulted with the slightest interruption from the iSCSI SAN connection ...
- 328
1
vote
0
answers
124
views
iSCSI connection from Ubuntu server fails/timeouts when booting
we set up an Ubuntu server (22.04.3 LTS) to use as a Veeam Repository. We want to connect a LUN on a NetApp storage via iSCSI.
The setup itself went without a problem till the server had to be ...
1
vote
0
answers
180
views
Multi-node OpenStack with iSCSI storage
I’m trying to deploy a multi-node OpenStack environment using Kolla, Ansible, and Ubuntu server. I successfully added a partition to my Cinder storage using iSCSI. But I can't configure OpenStack to ...
- 11
1
vote
0
answers
90
views
openstack nova have a long startup after the fast created volume
i have reinstalled OpenStack with the newest version (Yoga) and all base modules. The system is running fine but the time between the creation of the volume and the startup ist very long with ~10 ...
- 11
1
vote
1
answer
1k
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VMware vSphere 7.0 U3 + TrueNAS Core 13.0: can't create VMFS6 datastore from TrueNAS iSCSI disk. Why?
I have a bare metal server running vSphere/ESXi 7.0 U3d, and a bare metal NAS running TrueNAS Core 13.0. The NAS has a single pool shared via iSCSI; the pool is running all defaults (lz4 compression+...
- 61
1
vote
1
answer
784
views
iscsid broken mount after recovery
I am playing with Open-iSCSI and came across some troubles. When the network link between my initiator and the target fails, iscsid will recover the connection, which is good. But my mount is broken ...
- 111
1
vote
0
answers
19
views
Determining Required LUN Level Uniqueness
I have primarily used NFS for most of my storage needs but I find my self setting up some iSCSI targets today and had what is likely a super basic question.
When I create an export for an iSCSI target,...
- 23
1
vote
0
answers
294
views
qemu (KVM) how to set iscsi timeout on?
I have opensuse 15.2 Leap on all systems
qemu 4.2.1
# /usr/bin/qemu-system-x86_64 --version
QEMU emulator version 4.2.1 (openSUSE Leap 15.2)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU ...
- 11
1
vote
1
answer
637
views
Single host connecting to two iSCSI targets - Linux
I have one node set as initiator and two separate targets, each one on a different node.
How do I connect to the second target on node?
I'm trying to figure out how it should be done.
My initiator ...
1
vote
0
answers
260
views
State of OCFS2 as KVM storage for QCOW2 format
Using a shared iSCSI SAN all SSD and good cluster aware filesystems are few and far between with Linux. What is the state of OCFS2 with modern Linux kernels and is it considered reliable enough to ...
- 111
1
vote
0
answers
1k
views
Linux server wont shutdown - A start job is running for Login iSCSI Target
I am settin up a server with draut and iSCSI - I messed up a target / IP mapping, and now my server is stuck while booting:
A start job is running for Login iSCSI Target ... (23min 10s / no limit)
I ...
- 695
1
vote
0
answers
147
views
RHEL 7.8 (STIG'd (Locked-Down Image)) targetd faux-iSCSI front-end for Initiators -- Can't log in with CHAP from RHEL 7.8 Initiator
Here's my scenario:
Target: RHEL 7.8 (security lockdowns) using targetd/targetcli to configure /dev/sdb (100GB) presented as a block device and created as LUN0
Target(new): RHEL 7.8 (NO SECURITY ...
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