Questions tagged [iscsi]

iSCSI - SCSI over IP - mount disks across the network

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15 views

Ipxe sanboot: Boot ubuntu legacy bios disk

I have installed ubuntu-16 on 2 ISCSI disks, one with legacy bios and one with UEFI(I did this with QEMU). I want to boot these disks through IPXE on my openstack cluster I am able to boot ubuntu 16 ...
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VMWare ESXi 6.x: “Clustered” vs. “Local” storage

I'm reviewing a CSV dump of a vCenter Essentials configuration and under the storage column, I see: Device Type is "Local" and the Vendor is "Synology" with the Model as "iSCSI Storage". Presumably ...
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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 ...
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1answer
76 views

ISCSI and Windows Server 2019

I have 2 servers Main one is acting server the other one is providing HDD as ISCSI to main server. Purpose of this setup is Media Streaming sometimes there is transcoding involved. In application I ...
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Azure VM File restore - Target has already been logged

I have successfully used Azure Backup to back up my Azure VM but I can't recover file because it states "The target has already been logged in via an iSCSI session." I have checked the computer and ...
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1answer
3k views

Linux goes to swap while plenty of RAM installed

I have a linux box that is used as SAN storage. It is equipped with 14 SATA HDDs and the only software it run is iscsi target and zabbix agent. This is physical box, not VM. The RAM size installed is ...
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59 views

Mixed ocfs2 clusters: direct access and iscsi

Good morning, I have this configuration: diagram of configuration One "shared disk" with one partition formatted as OCFS2 Host A and host B with direct access to the "shared disk" Host C with direct ...
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iscsiadm deletes configured CHAP credentials; how to prevent this?

I have a home lab set up with libvirtd and iSCSI. I have most issues worked out/around but there's one issue that still puzzles me. I can't find an answer on Google or serverfault.com. Often when ...
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48 views

Proper Service Dependency (Boot/Shutdown) for: OpenVPN -> iSCSI -> mount LV (LVM) -> Docker

What would be the best way make sure that all the services run in the right order during the start up (OpenVPN -> iSCSI -> mount LV -> Docker) as well as during the shutdown (other way around), to ...
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1answer
77 views

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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Why is a full OS install needed for an iSCSI target?

I am researching how one might go about making PCIe SSDs accessible as an iSCSI target for a very small 2-3 server network, and using off the shelf DIY components. A mystery I am trying to answer is ...
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38 views

vCenter moving VM from ISCSI target to different ISCSI target

In my server lab, I am running a vCenter cluster with 2 ISCSI targets. Both of these are directly connected to switch using SFP+ port. I assume, when I do such a process as cloning a VM from one ...
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1answer
58 views

Unable to mount iSCSI shared Datastore on VMware ESXi

I had an iSCSI Datastore mounted and now am unable to remount it. There are 2 shares one of which is new and I want to copy the data from the old to the new. I have created a new datastore with the ...
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303 views

mount vmfs partition in esxi

I lost connection to an iSCSI disk, and after reconnecting the datastore has not mounted. I can see the VMFS partition, but I'm not sure how to mount it manually. The UI options don't seem to offer an ...
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63 views

CentOS can't boot because of iSCSIconnection not established

I have a CentOS 6.5 with a iSCSI disk connected. This disk is mounted as partition. Everything is working fine but after I tried to reboot, the system won't boot. It can't mount the partition /dev/...
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I'm not be able to add LVM partition in iSCSI shared storage

Hey guys currently I'm using proxmox 6.1 and i have created a cluster for high availability. I have one shared iSCSI storage from NetAPP, i want to create a LVM on that iSCSI storage but its asking ...
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1answer
49 views

DAS with MD3420 or iSCSI with MD3820i

Would there be a significant difference between these 2 setups? 2 esxi hosts connected MD3420 via SAS cables and HBA 2 esxi hosts connected to MD3820i via CAT6 cables without switch. How much ...
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45 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-
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HA configuration for KVM Guest on iSCSI shared storage [duplicate]

My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
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1answer
188 views

HA configuration for KVM machines installed on shared iSCSI storage

My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
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48 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 ...
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72 views

Emulex OneConnect 10Gb Network Unclaimed

As a novice im hoping to gain a helping hand, Ive recently switched from windows server 2019 over to Centos 7 and the server has a 10gb Emulex OneConnect nic / card installed. When using windows i ...
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ISCSI MPIO Extra devices, and is there meant to be an mpath0-part2?

I am trying to learn more about ISCSI and Multipath (MPIO) setup on a proxmox system. I thought I had everything working, but have that terrible spidey sense that something is incorrectly configured, ...
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393 views

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. ...
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154 views

Should I bond iSCSI network connections?

I'm setting up some iSCSI storage (Lenovo) along with a physical server running RHEL7. The server has 2 NICs for the main LAN (bonded) and 2 NICs for the iSCSI network. The Lenovo storage has 4 ports ...
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1answer
28 views

iscsi target shows up with multiple partitions - why?

We've been using CentOS 7 for a couple of years now to serve up iSCSI targets to our TigerStore metadata server on our SAN. We've used the same procedure to create the targets, detailed below. I just ...
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20 views

MPIO Fail Over Only Policy on mutiple ISCSI targets on different servers

So i have 2 windows server that act as a ISCSI target for 3 other windows that act as web servers. One as main and the other one is backup. Since they on different portal groups, is there any way to ...
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54 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 ...
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1answer
386 views

How to fix slow iSCSI speed (in comparison to SMB)?

I have a NAS which provides SMB and iSCSI targets, and a server which is directly connected via a 10 GbE link (no switch in between). I experience slow speeds with the iSCSI target in contrast to "...
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1answer
36 views

Real time storage for mutiple ISCSI Initiators

I have 3 Window Servers that acts as an initiators that connect to a same target through ISCSI and gain storage from it. Is there anyway to, if one server change the storage data, other can see and ...
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1answer
80 views

Microsoft iSCSI initiator- Automatically connect to another target if the first target suddenly become unavailable

I am trying to configure 3 Virtual Machine, all are window server 2016. One as an initiator while 2 others act as targets. Is there a way to automatically connect to the other target when the first ...
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1answer
1k views

Slow sequential speeds on 9x7-drive raidz2 (ZFS ZoL 0.8.1)

I'm running a large ZFS pool built for 256K+ request size sequential reads and writes via iSCSI (for backups) on Ubuntu 18.04. Given the need for high throughput and space efficiency, and less need ...
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Designing a performing iSCSI KVM storage stack

I had some performance issues with iSCSI in a production setup I was unable to debug (due to the production nature) and I'm trying to recreate setup to test, benchmark and eventually replace the prior ...
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3answers
1k views

iSCSI, multiple initiators for the same LUN

I have a web application that is distributed over 3 servers. These 3 servers need a shared storage to access files. Since iSCSI is just a protocol, not a filesystem, it will not have any ...
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1answer
777 views

PAGE_FAULT_IN_NONPAGED_AREA when booting Windows 10 from iSCSI network drive

I am trying to set up Windows 10 for diskless boot via iSCSI, as described, for example, here or here. I am able to run the Windows 10 installer to install Windows on the target iSCSI drive. However, ...
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2answers
70 views

ISCSI and SAN scaling

The Problem: I have a photography studio, and I ran into a problem when I just ran out of space on a monthly basis. Every month I just purchased additional HDD for a file server. now I have approx 120 ...
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1answer
74 views

Can you mix 10gb and Infiniband for iScsi storage target

I'm setting up a Fedora server to act as an iScsi storage target. The primary storage network will be 25gb Infiniband. Is it possible and/or safe to also allow the target to be accessed by 10gb ...
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1answer
44 views

iSCSI LUN from Centos mapped to xenserver is keep on disappearing

I'm trying to set up an ISCSI box for shared storage to connect to my xenserver environment. I am using Centos 7 as iSCSI storage. I am using targetcli for iSCSI configuration. I can set up ...
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48 views

Can (and when) split brain occur on failover cluster with 2 nodes and disk witness?

we have a two node cluster with a shared disk quorum (iscsi). we are experiencing every now and again failures that are resulting in downtime. In the logs we see the 'conflict IP' on the shared ip, ...
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132 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 ...
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32 views

Seeking iSCSI file copy flow clarification

I'm trying to diagnose a slow file copy issue but am a bit perplexed by the "behind the scenes" flow of data and am looking for clarification. The server in question is a Windows 2012 server and it ...
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1answer
151 views

Storage Setup for iSCSI/NFS servers

We are preparing to replace our storage servers (iSCSI+NFS). The current servers are Debian Wheezy using mdadm+lvm2 for storage, and failover using drbd and heartbeat (never got heartbeat to work). ...
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3answers
280 views

Creating a physical SCSI target out of an iSCSI one

I find myself having to maintain some old hardware for some legacy applications. These computers use old parallel SCSI drives, and when those drives die, I have to scavenge for new ones, which is ...
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1answer
795 views

Linux multipath: How to configure a single multibus path group

I have just upgraded a functional Ubuntu 16.04 host to 18.04 and am now having issues with multipath. Package versions: * multipath-tools 0.7.4-2ubuntu3 * open-iscsi 2.0.874-5ubuntu2.7 I have a Dell ...
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690 views

What can be done increase bandwidth from Citrix XEN guest to Citrix XEN guest on the same physical host?

Guest VM to guest VM bandwidth on a single Citrix 7.6 XenServer host caps out at about .6Gbits/s using UDP and 6Gbits/sec using TCP. UDP performance over restricted shared memory does not reach ...
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1answer
107 views

ZFS on iSCSI devices (with Encryption?) [closed]

I own an old NAS (Buffalo TeraStation Pro II) with four 500GB Samsung HD502IJ SATA drives. On the NAS i installed Debian 9. The NAS is pretty old and consumes a lot of engergy already without any ...
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133 views

Win2012 R2 Server hanging after iSCSI install

Issue: Server was experiencing hanging issues after 7 hours of uptime. Server had no issues prior to addition of iSCSI. ?Temporarily? Resolved by reboot. iSCSI Device: QNAP TS-1263XU-4G-US 2U with 2x ...
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1answer
1k views

Start open-iscsi at startup (systemd)

I'm on debian 8, I have no a lot of knowledge on linux and the last time I used it it was a while again. (when systemd didn't exist). When I do manually start the open-iscsi service the iSCSI drive ...
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3answers
273 views

Why has open-iscsi two times slower writes than Samba via 10G Ethernet?

On my local file server I have raid-6 on 7x HDD drives. dd if=/dev/zero of=tempfile bs=1M count=2048 conv=fdatasync Local speed test gives me 349 MB/s write speed. Remote writes to Samba from SSD (...
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Performance issue with debian guests on xenserver with iscsi storage

I am facing a performance issue with my small virtualization environnment. I have two Dell PowerEdge 2950 and a Qnap TS-453-BU. The Dells are equipped with XenServer 6.5.0 and they are attached to an ...

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