Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [iscsi]

iSCSI - SCSI over IP - mount disks across the network

iSCSI is Internet Small Computer Systems Interface, and is a standard for sending SCSI commands across the IP layer of the TCP/IP suite.

Unlike ATA over Ethernet, (ATAoE) iSCSI allows you to use the same network link for mounting remote storage as well as communicating with the rest of the network.

852 questions
9
votes
3 answers

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 (>2Gb/s read speed) gives me 259 MB/s writes. But…
BarsMonster
  • 724
  • 4
  • 12
  • 26
9
votes
6 answers

Low performance both iSCSI and AoE

We are looking for a resonable speed storage. Because of low budget we decided to use software iSCSI or AoE targets. Before we change our production infrastucture, we are doing some tests to choose the best technology. For testing we use: Fujitsu…
Sebastian Biniecki
  • 91
  • 3
9
votes
1 answer

iSCSI design options for 10GbE VMware distributed switches? MPIO vs. LACP

I'm working on expanding the storage backend for several VMware vSphere 5.5 and 6.0 clusters at my datacenter. I've primarily used NFS datastores throughout my VMware experience (Solaris ZFS, Isilon, VNX, Linux ZFS), and may introduce a Nimble iSCSI…
ewwhite
  • 197,159
  • 92
  • 443
  • 809
9
votes
1 answer

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 server", I have two targets defined in…
OldTroll
  • 1,686
  • 2
  • 12
  • 18
9
votes
1 answer

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 recommended and MPIO should be used instead (there…
morleyc
  • 1,150
  • 13
  • 47
  • 89
9
votes
2 answers

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 6GB files using dd and various blocksizes show great…
Alex Holst
  • 2,240
  • 1
  • 15
  • 13
9
votes
3 answers

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 the client machine, two of the 6 partitions do not…
Ian Murphy
  • 1,349
  • 4
  • 19
  • 30
9
votes
4 answers

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 primary SAN server goes down, the secondary picks up the…
Kamil Kisiel
  • 12,184
  • 7
  • 48
  • 69
9
votes
6 answers

What are "good" speeds for iSCSI and NFS over 1GB ethernet?

I have an OpenSolaris box sharing out two ZFS filesystems. One is an NFS connection to a CentOS box running VMware server (the disk images are stored in ZFS). The other is an iSCSI connection to a Windows 2008 server with NTFS formatting on top of…
Sysadminicus
  • 596
  • 4
  • 8
  • 20
8
votes
3 answers

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 getting increasingly difficult. Is it feasible to run…
Salvatore Shiggerino
  • 91
  • 2
8
votes
3 answers

How to specify sector size for LVM logical volume?

I'm creating logical volumes for export via targetcli (iSCSI). I'm using lvm's thin provisioned volumes, e.g. lvcreate -V 1T --thin -n vol_name storage/thin_pool Then I add the created logical volume into targetcli's iblock backstore. The…
velis
  • 233
  • 2
  • 10
8
votes
3 answers

Why should iscsi traffic be isolated?

Why should iscsi SAN traffic be isolated? I'm trying to explain to my network guy why we should isolate the traffic.
Jeffery Jarrells
  • 81
  • 1
  • 2
8
votes
1 answer

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 2012 on a Hyper-V Virtual Server which has iSCSI…
bigmac
  • 459
  • 3
  • 8
  • 18
8
votes
2 answers

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 advisable to : pause the VM's flush and turn…
janos erdelyi
  • 225
  • 1
  • 4
8
votes
3 answers

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 trunk the right way to go between the switches? I…
3molo
  • 4,330
  • 5
  • 32
  • 46
1
2
3
…
56 57