iSCSI - SCSI over IP - mount disks across the network

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1answer
1k views

Why does Hyper-V and Windows Backup crash (BSOD) after successfull backup?

Hello I am running Server 2008 R2 with a handful of Hyper-V guest nodes. If Windows backup runs without any of the Hyper-V nodes running, the server is fine. If Hyper-V runs a backup while the Hyper-V ...
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1answer
1k views

Is it possible to create a multipath iSCSI target with two DRBD nodes?

I can put together two linux servers and use the (more or less) new DRBD dual-primary feature to get a shared block device with concurrent read/write access on the two nodes. Can I then export an ...
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4answers
3k views

Single/Mulitple LUN for massive VM hosting

I'm building a iscsi storage system for hosting about ~500 Vmware vm running concurrently. And I have a disk array with 15 disks, I only need moderate write performance but at least raid1. so, that ...
3
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2answers
902 views

DAS vs SAN storage for serving 2 to 4 nodes

We currently have 4 Linux nodes with local storage, arranged in two active/passive pairs with storage mirrored using DRBD, running virtual machines (actually using Xen Hypervisor) for typical hosting ...
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1answer
70 views

Cache in Storage array [closed]

Hi I just started working in a Storage Lab. I am new to Storage Area Networks, I did lot of searching on Internet about this. I have two doubts : How can we know whether a Storage array has a cache ...
2
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2answers
586 views

Multiple iSCSI Targets or 1 that's shared?

On my network I have several types of files I want to save on a SAN like: SQL db's and logs Exchange data Random files Now I'm wondering if I should create one iSCSI Target with a large volume and ...
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2answers
327 views

Connecting to EqualLogic with Starwind Starport Initiator, login trouble?

We have a working iSCSI SAN, an EquallLogic, which runs fine with the Microsoft iSCSI initiator. With the Starport Initiator, we can't even connect. There's no login needed, neither local nor LDAP. ...
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1answer
811 views

Connecting to iSCSI Target

I've installed Microsoft iSCSI Software Target 3.3 on a server 2008 R2 machine and created a new iSCSI Target. In the target I created a new Virtual Disk. From another server I started iSCSI ...
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4answers
19k views

Disk IO slow on ESXi, even slower on a VM (freeNAS + iSCSI)

I have a server with ESXi 5 and iSCSI attached network storage. The storage server has 4x1Tb SATA II disks in Raid-Z on freenas 8.0.4. Those two machines are connected to each other with Gigabit ...
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1answer
260 views

Dell Equallogic PS6100x network configuration

So we just picked up a new PS6100x and I'm wondering if I need to setup the ethernet channels myself or is it automatic? It's configured in an HA setup; dual controllers connected to redundant cisco ...
4
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3answers
540 views

What to look for in a switch with LAN/WAN verses an iSCSI SAN?

I'm setting up a VMWare ESXi 5 environment with 3 server nodes. Dell recommended 2x Force10 S60 switches shared (iSCSI SAN, LAN/WAN). The S60 switches are extremely powerful. They have 1.25 GB of ...
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1answer
398 views

iSCSI filesystem creation on Linux - Best Practices - Large Volumes - Many Files?

We recently purchased HP Lefthand 4500 G2 24TB box and also a DL380 G7 server. I'm running Centos 6.2 (RHEL 6.2). The Lefthand box consist of 12 2TB HD's configured in RAID6. That gives me about ...
3
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1answer
161 views

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 ...
5
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1answer
2k views

Configuring HP “Multifunction” NIC for iSCSI SAN

I am about to implement a SAN here using a HP P2000; the SAN itself is on-order (ETA a couple of weeks) so in the meantime I'm getting the rest of the equipment up and running. The SAN has ...
29
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3answers
4k views

Tuning iSCSI storage

This is a Canonical Question about iSCSI we can use as a reference. iSCSI is a protocol that puts SCSI commands as payload into TCP network packets. As such, it is subject to a different set of ...
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2answers
389 views

VMware - how best to remove an extent from an iscsi volume

In our dev/test environment, I have a vSphere 5 ESXi server running. I have one particular vm on it that went into a panic state because one of it's virtual disks was hosted on a volume that ran out ...
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1answer
498 views

Unable to initialize BlackArmor after running iSCSI Manager and Windows 7 iSCSI Initiator

I want to add a 12TB NAS to my current iSCSI, which already controls an Iomega StorCenter ix2-200 1TB NAS. I've connected to the new NAS via Windows 7 iSCSI Initiator. When I open Disk Manager it ...
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1answer
2k views

vSphere 5/Dell MD3000i multipathing configuration clarification

Revisiting an older vSphere setup with two Dell 1950s, 4 NICs per host: esxi1 and esxi2 for simplicity sake. SAN is a Dell MD3000i, two controllers, two NICs per controller: rc00 and rc01; rc10 ...
2
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1answer
521 views

Viewing map of iSCSI target -> LU in COMSTAR

I'm creating a number of iSCSI targets on an OpenIndiana server using COMSTAR. Basically: zfs create -V 10g pool/comstar/vol sbdadm create-lu /dev/zvol/rdsk/pool/comstar/vol stmfadm add-view ...
6
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1answer
1k views

Which events specifically cause Windows 2008 to mark a SAN volume offline?

I am searching for specific criteria/events that will cause Windows 2008 to mark a SAN volume as offline in disk management, even though it is connected to that SAN volume via FC or iSCSI. Microsoft ...
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2answers
424 views

Feasibility of controlling two or more NAS via iSCSI

We currently run a two-year-old Iomega StorCenter ix2-200 through Windows iSCSI initiator on a Dell Optiplex 745. Meanwhile, we have two Seagate BlackArmor 440's running independently through Ethernet ...
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0answers
245 views

install network drivers on a diskless windows 2008 R2

I have a dell r715 with a Broadcom NetXtreme II 1 Gigabit Server. I am booting my Windows Server 2008 R2 through iSCSI from a SAN. I want to install my network drivers. When I try to install my ...
2
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1answer
258 views

iSCSI aggregation using one switch

Thinking of doing 2Gb aggregated iSCSI between a VM Host and a multi controller iSCSI array. Multipath with two switches is normal for this, but I only have one switch at the moment. But the switch is ...
2
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0answers
882 views

Volume manager of Windows Server 2008 R2 does not show all iSCSI volumes

we set up a backup server (Win2k8 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 ...
7
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2answers
3k views

Troubleshooting strategy for very poor iSCSI/NFS performance

We have a new Synology RS3412RPxs that offers iSCSI targets to three Windows 2008 R2 boxes and NFS to one OpenBSD 5.0 box. Logging into the RS3412 with ssh and reading/writing both small files and ...
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0answers
1k views

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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2answers
509 views

RHEL iSCSI on FreeNAS

I am able to mount a iSCSI SAN drive onto multiple RHEL Servers, but when I make changes to the files on SAN, they are not evident on the other servers sharing the same drive. Am I missing something? ...
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2answers
265 views

iSCSI basic concepts

I have just detected that in one of my hosts (this is a virtual machine run by a cloud provider) there is a process eating up some bandwidth: NetHogs version 0.6.0 PID USER PROGRAM ...
2
votes
1answer
342 views

Windows 7 routing traffic through the gateway for local addresses

Windows is adding a route for a local address (10.0.0.90 - my fileserver) with a gateway of (10.0.0.138 - this is my gateway), the gateway only has a 100Mbs link so all of my fileserver bound traffic ...
1
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1answer
484 views

ESXi 5 - Custom build iscsi or openfiler?

This is for a development environment, NOT a production environment. We have 2 ESXi 5 hosts that is currently using their own local disks for storage. We have a very large Supermicro server that has ...
5
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1answer
1k views

Esxi with iSCSI SAN slows down with many multiple VMs running

I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas). Those two machines are connected to each other with Gigabit ethernet, and a procurve switch in between. After ...
5
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1answer
758 views

Dedicated NIC or dedicated port for iSCSI?

When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That ...
0
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1answer
394 views

iSCSI storage, partitioning and LVM

We are in the process of moving our (direct attached) storage systems to an iSCSI based consolidate storage and we have come up with this interesting question: where should we place LVM processing? ...
3
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2answers
272 views

DPM 2010 iSCSI Mirror

We're using DPM 2010 for exchange backups, The backup Disk(s) are iSCSI attached drives from multiple NAS boxes. We'd like to mirror iqn.2009-07.com.example.example:RAID.iscsi4.vg0.iscsi05 onto ...
8
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2answers
243 views

Can i pause VM's while power-cycling iscsi storage array

Unfortunately I may have to power-cycle my storage array. In the context of using KVM with libvirt managing the Virtual Machines where i need to power-cycle the storage array, is it possible or even ...
1
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1answer
1k views

Win2K8 Server MPIO iSCSI failover not working

I have a desire to pass iSCSI traffic between my Windows 2K8 Server lab system and my NetApp filer across two separate network stacks*. My configuration is as follows: one Win2K8 server with the ...
0
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1answer
520 views

Linux Multipath - Can a Host connect to two different SANs?

I may need to power-cycle a SAN and i'm looking to avoid downtime. I have some options to essentially copy live LUNs from one SAN to another. Currently i have a single iSCSI SAN and i connect to it ...
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1answer
6k views

Cannot enable iSCSI port binding without adding a physical NIC to the vSwitch

Why can I not have a purely virtualized SAN in vSphere 5? I cannot enable the iSCSI port binding option (it is greyed out and unchecked) or add the VMkernel to the iSCSI software host bus adapter ...
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2answers
512 views

Is vSphere 5 compatible with an OpenIndiana/Napp-it iSCSI datastore?

My hostd.log file on vSphere 5 says that partedUtil is timing out while trying to write the partition table on an iSCSI target being served from OpenIndiana/napp-it. I read that sized over 2TB give ...
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2answers
914 views

NTFS on iSCSI - Mounting two Server 2008 servers to same LUN

I'm aware that you can't mount a single LUN to two read/write NTFS iscsi volumes without massive issues unless you are using clustered servers. However, I'm curious about mounting 1 iscsi lun ...
1
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1answer
237 views

How to set client-based ACL on iscsi target?

Say I have the following set up. <target iqn.2012-02.local.mydomain.server1.target1> backing-store /dev/virtstore/virtimage1 </target> <target ...
6
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1answer
417 views

Completely disjoint iSCSI networks vs dedicated switches and VLANs

I'm looking for best practice or pros/cons for deploying an iSCSI storage network. The two options are: A completely disjoint iSCSI storage network Dedicated switches with a separate VLAN for ...
1
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1answer
543 views

Microsoft iSCSI Initiator: How to pass a CHAP user name?

I need to connect a Win2008 R2 server to a iSCSI target and I'm supposed to use a CHAP user name that is different from the initiator name. Technet says: By default, the Microsoft iSCSI Initiator ...
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2answers
2k views

iSCSI initiator cannot remove session on boot drive

I'm very new to iSCSI so forgive me if I use the wrong terminology. I have two nics on my host with IP addresses that can see my iSCSI device (DELL MD3200 if it matters). We are booting the system ...
4
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2answers
1k views

Recover NTFS data from a ZFS pool that was exposed as an iSCSI target

This was me being stupid and the data is by no means critical and is now a learning experience first, time saver second. I set up a 100GB iSCSI target via the bare bone instructions in napp-it. It's ...
1
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1answer
958 views

Mounting an additional iSCSI volume in Centos without restarting the iscsi initiator

I don't know if I'm missing something but when I'm mounting additional iSCSI volumes to a said server to add additional storage to a server I'm not seeing a way to mount the volume after running a ...
1
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1answer
894 views

MD3200i Slow Performance and Queue Depth

Read performance on our SAN is slow under certain workloads. When we compare this to some local storage, we find the local storage performing 2x as fast. The SAN performs well with a high Queue ...
0
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1answer
67 views

What could be causing this bottleneck on Nextenta

I have a Nextenta box connected to another Windows 7 machine via iSCSI. It is getting horribly slow average write speeds, but a large active time in the Windows Resource Monitor. The machines are ...
3
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2answers
2k views

hosting iscsi on smartos

I am trying to get back into the unix game for some storage projects we have got going. We would love to use joyents smartos (based on illumos) for that. Working with it is a real joy (setting up vms ...
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1answer
320 views

Solaris: Clone/Recreate iSCSI target not backed by a ZFS Volume

Is it possible to re-create or clone an existing iSCSI target not backed by a ZFS volume? I ask because upon rebooting a X4500 Thumper, I was affected by this bug: ...