iSCSI - SCSI over IP - mount disks across the network

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3k views

Unable to discover iSCSI targets

I have a trio of CentOS 6.4 machines that I'm trying to configure to use iSCSI. Basically two different initiators talking to two different targets on a single host server. On one machine, "the ...
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735 views

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 ...
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552 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 ...
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60 views

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 ...
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1k views

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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6k views

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 ...
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16 views

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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23 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 ...
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38 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 ...
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42 views

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 ...
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526 views

Booting a diskless Debian system using bonding, bridging, and iSCSI

I'm trying to build my personal holy grail: booting my Debian Wheezy KVM server diskless from a iSCSI target and the only configuration needed on the diskless server is the iSCSI parameters in the NIC ...
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758 views

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 ...
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1k views

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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2k views

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 ...
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714 views

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 ...
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7 views

Received legacy SPC-2 RESERVE/RELEASE while active SPC-3 registrations exist, returning RESERVATION_CONFLICT

I have 2 iSCSI fileio backstores. I try to Determine whether shared disks can be used as tiebreaker disks . For that I run on the iSCSI initiator a tool from IBM to release the reservation: [root@...
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35 views

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' ...
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34 views

esxi vmware iscsi-datastore lost after power outage

I usually just try to find my own solution until it just works, this time not so much.. I have a ESXi cluster, with 2 hosts and 1x datastore cluster. Earlier today after a power outage, everything ...
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26 views

Same LUN trough FC and iSCI to different hosts

On my small vMware lab I'm presenting the same LUN to both ESXi hosts, one from FC and another from iSCSI. iSCSI finds the devices but doesn't mount the datastore. As I can see disks have different ...
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26 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/...
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26 views

XenServer 6.5 Zeroed Performance Metrics for IOPS

In one of my XenServer 6.5 pools, I'm adding some graphs in XenCenter to measure my iSCSI storage IOPS and throughput performance and I'm getting no response. The graph is actually responsive, but ...
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19 views

Sharing iSCSI from one NIC to another on same machine

I have a Windows 2008 system with 2 NICs. One NIC is connected directly to an NAS (NIC1), and the other NIC is connected to the general network (NIC2). I am trying to share a iSCSI connection from the ...
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37 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 ...
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27 views

Server 2012 iSCSI target remains after deletion

I've got server 2012 as an iSCSI target, and a server 2003 (not R2) as iSCSI initiator. The initiator sometimes hangs and says "reconnecting..." and I think it's because an old target shows up, but ...
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29 views

ietd - spamming logs ietd: unable to connect (Connection refused) 2

I have a fileserver (debian wheezy, 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux) set up with open-iscsi, o2cb, ocfs2. 3 connected clients and the fileserver itself are working great, ...
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84 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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250 views

VMWare ESXi and iSCSI via FreeNAS

I've recently been setting up a sandbox ESXi environment with a VM running FreeNAS providing a volume which is connected as a datastore on the host via iSCSI. I've created a VM on this datastore and ...
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17 views

Source IP of VMware storage paths

I have an iSCSI array that is working fine with my VMware host. I'd like to disable several paths because they don't have end-to-end jumbo frames. For the life of me I can't tell what the source IP ...
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165 views

Linux iSCSI - Limit max concurrent sessions

I would like to understand if, and how to, limit the maximum number of simultaneous connections to a specific LUN under CentOS Linux, both with the old iSCSI stack (tgtadmin and friends) and the new ...
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39 views

iScsiPrt errors preventing system from returning from display rest

I am encountering a weird error in Windows 7 x64 Ultimate SP1. At random intervals, when coming back to the computer after being away long enough for the screen to rest, it will instead come back to a ...
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1k 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 ...
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157 views

Can't mount read-write iSCSI with MTU=9000

I'm attempting to connect my desktop (running debian 7) to a QNAP NAS (running QTS 4.1.1) using iSCSI with an MTU=9000. The network infrastructure consists of a cat5e crossover cable between the ...
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93 views

Running iSCSI LIO with high availability

I've build a two node storage setup with OCFS on top of DRBD to provide storage for a couple of ESXi servers. Will it be possible to setup iSCSI targets on both storage nodes and make one of the nodes ...
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149 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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335 views

Adding external datastore to esxi, expanding datastore

I have an esxi 5.1 on a 1U server, accessed using vSphere. There are two 160G HDD's inside on RAID1. I'm looking to expand the number of VM's and the required storage is going to exceed this paltry ...
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234 views

Vmware Nas slow transfer rates/IOPS

I have built a test environment with a Synology RS812+ and an old HP140 server which has a gigabit nic installed. I have dedicated one nic to the network to DHCP and the direct to NAS from the server ...
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943 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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167 views

Upstart task to wait for iscsi target to become available?

I've got a couple of virtualization servers running Ubuntu 12.04 and Virtualbox and just bought a Synology NAS which I plan to use as an iSCSI target to serve storage for the VMs. I realize that ...
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150 views

share an iscsi target thru samba

i just built an Openindiana/Napp-it box and i dont really want to get into Solaris ldap client setup. Does it sound doable to create a linux vm, set up samba on it, then connect to an iscsi target ...
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Equallogic ESXI 4.1 Slow read performance

We experience a slow read performance with a high read latency in vSphere/ESXi on our Equallogic iSCSI array (14x 750gb in RAID10). We checked already very much but cannot find anything. Setup: ...
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915 views

iSCSI connection is gone and when reconnected drive can't be accessed anymore on Windows 2008 R2

My client has QNAP library that I've used to share 2 iSCSI connections. One to physical machine and the other to virtual machine on top of that machine. One is 4TB (connected to physical machine) and ...
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423 views

Problem installing Microsoft iSCSI initiator on Windows 2003

Anyone got any idea what this is about: "Windows iSCSI200 has detected one or more protected files on your computer have been modified". I'm guessing that a service pack or Windows update has ...
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653 views

Replacing LeftHand SAN Hard Disk Outside of Warranty / Service Contract

I am working with 3 clusters of LefHand SAN iSCSI storage arrays. The modules are all older NSM 150s and NSM 160s (super micro server hardware, sata disks). The workload is low priority and all ...
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10 views

Fujtisu Eternus DX80 change iSCSI Discovery Reply Mode

I have a configuration mistake in my dx80 and the system is already in production. I have to set "iSCSI Discovery Reply Mode" at "Host Response" configuration to "All - Reply All Ports (Default)". Is ...
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22 views

iSCSI Disk Usage on Initiator Does Not Match Target's Usage

I have a pair of Ubuntu 14.04 installs running within VirtualBox. I installed the IET target server (iscsitarget package) and have it properly serving up my selected LVM volume; this volume is ...
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37 views

iSCSI Virtual Disk Missing

I have one Supermicro server with Windows Server 2012 used as NAS with RAID1 which crashed and after reboot half or the disk has gone either failed or missing, I did manage to get all of them fixed ...
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40 views

ISCSI Targetcli backstores fileio attach an existing image file

I can't seem to find an answer to this simple question. How do I attach an existing raw image file as an iSCSI backstore target using targetcli? I am using CentoOS 7. In targetcli I can get into /...
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26 views

Can't access drobo Pro via iscsi on new subnet

We have a Drobo Pro on our subnet which works fine via iscsi, however I am in the process of moving the servers over to a new subnet. I can access the Drobo with DroboDashboard via USB on my Mac and ...
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47 views

wbadmin discardes complete backup history after dynamically resizing virtual **source** volume

A customer SBS2011 (Windows Server 2008 R2) is incrementally backuped using wbadmin. The system ist hosted on a VMware ESX 5. We dynamically increased the size of one of the volumes which is backed up....
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42 views

Windows Server Backup - iSCSI and USB Drives

Been using S2012R2 built in backup for a while with great success now, using a single USB3 external drive for daily backups. (1.6TB data approx). We're now looking to add an offsite backup, where we ...