iSCSI - SCSI over IP - mount disks across the network

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29
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3answers
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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 ...
25
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7answers
7k views

SQL Server disk design on an ISCSI SAN

Its standard practice to separate log and data files to separate disks away from the OS (tempdb, backups and swap file also) Does this logic still make sense when your drives are all SAN based and ...
24
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15answers
18k views

Cheapest iSCSI SAN for Windows 2008/SQL Server clustering?

Are there any production-quality iSCSI SANs suitable for use with Windows Server 2008/SQL Server for failover clustering? So far, I've only seen Dell's MD3000i, and HP's MSA 2000 (2012i), which both ...
22
votes
3answers
15k views

Testing whether jumbo frames are actually working

Is there a command to test whether jumbo frames are actually working? i.e. some sort of "ping" that reports whether or not the packet was broken up along the way. I've an ESXi host with an Ubuntu VM ...
13
votes
7answers
10k views

SQL Server Files Local or NAS or SAN?

I have to install a new Server with SQL Server 2008, What do you recommend, One server with Raid 10 or the Files in a NAS? What about iSCSI should I use it? What about SAN? The server has 4Gb of ...
13
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1answer
231 views

How to crack the 1 Gbit iSCSI limit between ESXi and VNXe

I'm having big troubles with my iSCSI network and can't seem to get it working as fast as it could. So I've tried pretty much everything to gain full performance from my SAN, having involved ...
11
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2answers
21k views

LV Status: Not available. How to make it available?

I connect an iSCSI target, create a Physical Volume and Volume Group on it. Then I create an LV, and mkfs.ext3 /dev/vg00/vm and all that works great. Then I disconnect the target iscsiadm -m ...
11
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6answers
675 views

How to utilize spare workstation drive space for server storage/backup

So, given the fact that you can only get hard drives of about 160GB now for the cheapest price, I find i have a ton of extra drive space on workstations spread throughout my office. I'd like to ...
8
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3answers
6k views

Setup of HP ProCurve 2810-24G for iSCSI?

I have a pair of ProCurve 2810-24G that I will use with a Dell Equallogic SAN and Vmware ESXi. Since ESXi does MPIO, I am a little uncertain on the configuration for links between the switches. Is a ...
8
votes
2answers
242 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 ...
7
votes
3answers
7k views

Recommended switch for an iSCSI implementation [closed]

We want to implement an iSCSI SAN and all of our testing has shown that we can implement this quite cheaply (Starwind target, refurbished HP Storage array). What concerns me is the throughput/latency ...
7
votes
4answers
7k views

Xen DomU root filesystems becoming read-only on iSCSI virtual IP failover

My Xen servers are openSUSE 11.1 with open-iscsi to our iSCSI SAN cluster. The SAN modules are in an IP failover group behind a virtual IP that the initiators connect to. In the event that the ...
7
votes
2answers
2k 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 ...
7
votes
2answers
229 views

iSCSI using uplink ports on switch

Do the uplink ports on switches typically work okay as iSCSI ports? We're adding a 10gb iSCSI SAN, and want to get a combo switch (48x1gb & 4x10gb SFP+ uplink ports) and use the 10gb for the iSCSI ...
7
votes
4answers
554 views

ESX3.5 Cluster & MD3000i — Both servers see iSCSI Targets, Only one server can use partition

Alright. First and foremost, Warning. This is a bigger-then-normal question. I like to be thorough and try to eliminate all possible "easymode" answers, as well as give everyone a feel of what i've ...
7
votes
2answers
3k views

Snow Leopard iSCSI initiator

I'm getting ready for a large Snow Leopard migration and am having problems with the standard iSCSI initiator from globalSAN. After some research I found out that the initiator is just incompatible ...
6
votes
6answers
2k views

iSCSI for databases, good idea

Is it a good idea to have a transactional database running on a server that uses iSCSI? They main argument is that you can have two servers accessing the same disk array, so if one server breaks the ...
6
votes
3answers
1k views

How to upgrade an iSCSI Switch stack with minimal downtime?

We have several Dell 6248 swtich stacks (of 3 each) that form the backbone of our iSCSI Storage network. We need to perform firmware updates on the switch stacks, but are concerned about the downtime ...
6
votes
1answer
286 views

Why MPIO instead of 802.3ad Team for iSCSI

Doing my first server to iSCSI target and I thought i would be off to a running start by teaming my NIC on the server (conventional 802.3ad team). However, from many online sources I see this is NOT ...
6
votes
1answer
403 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 ...
6
votes
2answers
583 views

links between switches for iSCSI

We inherited a SAN/vmWare/iSCSI setup with both Dell and HP equipment purchased for it, but not fully setup, and we need to get some additional switches to make it all work. But we're getting ...
6
votes
3answers
7k views

EMC VNX iSCSI setup - unsure about SP/port assignment

We have a new VNX5300 waiting to get configured, and I need to plan out the network infrastructure before the EMC tech arrives. It has 4x1gbit iSCSI per SP (8 ports in total), and I'd like to get the ...
6
votes
1answer
94 views

IQN Naming convention

I've seen a lot of information about how IQN's should be formatted, but there's not a lot of information on how to build them. I'm kind of a newb when it comes to iSCSI, and i have it working, but I'm ...
6
votes
2answers
2k views

Tuning Open-iSCSI initiator settings for VM LUNs

I have a bunch of VM servers running Xen VMs from iSCSI LUNs mounted in the Dom0 host via Open-iSCSI. It's just a simple single-path setup (redundancy is on the target side via clustered storage and a ...
6
votes
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 ...
5
votes
3answers
5k views

How can I use NTFS and iSCSI and not corrupt my SAN?

I know you can't use multiples NTFS machines/servers with the same SAN iSCSI target without corruption. I have multiple servers, however, that need access to the same data on the same SAN. I do not ...
5
votes
8answers
2k views

Practical SAN Question

I am designing the next evolution of our IT infrastructure. I am considering implementing an iSCSI SAN. My current plan is to connect only our servers to the SAN, and then implement any file sharing ...
5
votes
8answers
7k views

Can you use your own drives on Dell PowerVault MD3000i?

I would like to use my own drives in the Dell PowerVault MD3000i. Does anyone know if you are able to? We are looking at different SANs for our VM farm and would rather be able to replace a drive in ...
5
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5answers
1k views

Mixing SAN iSCSI Traffic with core network traffic, Am I asking for trouble?

I am configuring a new network and had a couple questions I am finding hard to find good answers about best practices on using VLANs to separate Core network traffic and iSCSI traffic. The switches ...
5
votes
2answers
243 views

Networking with VMware, physical adapters and iSCSI

New VMware user here, setting up my first environment. I have an ESXi host that has four physical NiCs (NiC0, NiC1, NiC2, NiC3). I have installed ESXi, the VCVA appliance, and several VMs ...
5
votes
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
votes
3answers
273 views

What are some shared-disk filesystems people have successfully used with iSCSI?

The setup looks something like this. The goal is to have multiple computers mount a single LUN from the iSCSI target. Ideally mounting read/write and with ACL support. The servers are running ...
5
votes
2answers
1k views

SAN Vendor vs Whitebox NAS Performance

How well do traditional operating systems stack up quantitatively (no gut feelings) against proprietary hardware in terms of performance, reliability, and maintainability for a storage system. ...
5
votes
1answer
353 views

100% packets dropped on first RX queue on 3/5 raid6 iSCSI NAS devices using intel igb (resolved)

Edit : The issue is resolved. The Queues in question have been used for Flow Control Packets. Why the igb driver propagated FC packets up to have them dropped (and counted) is another question. But ...
5
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2answers
3k views

iSCSI drive doesn't mount after reboot of windows 2008 r2

I have a server with Win2008R2 and a synology NAS. On the Nas there are 6 iSCSI partitions which are mounted on the windows server. The windows server is virtualized under Hyper-V. After rebooting ...
5
votes
1answer
712 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 ...
5
votes
1answer
704 views

BitLocker with Windows DPAPI Encryption Key Management

We have a need to enforce resting encryption on an iSCSI LUN that is accessible from within a Hyper-V virtual machine. We have implementing a working solution using BitLocker, using Windows Server ...
5
votes
1answer
595 views

Home-grown SAN — topology ideas?

I'm interested in hand-rolling a SAN solution on Linux with the following technologies: iscsi mdadm raid lvm multipath xfs/gfs/??? teamed NICs Hardware-wise, I'm thinking of 2 x gigE (or better) ...
5
votes
8answers
1k views

Is iSCSI SAN still a spof in a cluster? Can it be highly available?

I'm currently evaluating a Win2k8 two node file server cluster that is connected to a Win2k8 Storage Server iSCSI SAN. The failover is working perfectly, but I'm now wondering what will happen if the ...
5
votes
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 ...
5
votes
3answers
861 views

Linux NIC bonding on top of vlan interfaces?

Is it possible to set up bonding(active/backup) on top of existing vlan interfaces ? Assume the following scenario: Linux Server with 2 NICs connected to separate switches iSCSI initiator + MPIO to ...
5
votes
3answers
988 views

Why is my MPIO connection to the SAN capped at 1 Gbps when using Linux?

I'm connecting a RHEL5 box to a Dell EqualLogic PS5000X and seeing a maximum of 1 Gbps even while using MPIO with three gigabit NICs. I have all three interfaces on the PS5000X and three dedicated ...
4
votes
3answers
246 views

What role does virtualization play in a network with a SAN?

Can't you just ditch virtualization and boot directly off a volume in the SAN?
4
votes
1answer
5k views

Why are two servers viewing the same drive unable to view the same files?

I have two windows 2008R2 servers. Both are pointing to the same iSCSI drive on our SAN, but both servers don't see the same data. Server 1 can write data to the SAN, and can immediately see what it ...
4
votes
7answers
2k views

Linux tool/command to check file system performance

What is the simplest way to check read/write performance to a specific location (e.g. a mounted iSCSI device). I suspect I can't use hdparm because that's lower level. Am I right?
4
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7answers
1k views

Rough estimate for speed advantage of SAN-via-fibre to san-via-iSCSI when using VMware vSphere

We are in the process of setting up two virtualization servers (DELL R710, Dual Quadcore Xeon CPUs at 2.3 Ghz, 48 GB RAM) for VMware VSphere with storage on a SAN (DELL Powervault MD3000i, 10x 500 GB ...
4
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5answers
1k views

Decent 1gb switch (16-24 port) for rack

For a rack containing a smaller nubmer of servers (5 at the moment, going to stay in this area), I am looking to replace the currently aging 100Mbit switch with a 1Gb switch. This is for the backend ...
4
votes
3answers
531 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 ...
4
votes
3answers
2k views

Jumbo Frames, ISCSI and ESXi

I have enabled Jumbo Frames (9000) in ESXi for all my vmNICs, vmKernels, vSwitches, iSCSI Bindings etc - basically anywhere in ESXi where it has an MTU settings I have put 9000 in it. The ports on the ...
4
votes
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 ...