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Questions tagged [open-iscsi]

37 questions
10
votes
1 answer

Poor iSCSI performance with SSD disks and 10 Gbe network

iSCSI Target Ubuntu 14.04 (Trusty Tahr) with 16 GB RAM and 16 core CPU as LVM backed iSCSI target using three Samsung SSD disks, each capable of doing 65k IOPS using an LSI 6 Gbit/s controller with on board cache. Benchmark on SSD disk in…
Kevin Parker
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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
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6
votes
3 answers

TRIM/UNMAP Zvol over iSCSI

I am currently setting up a SAN for diskless boot. My backend consists of ZFS-Vol shared via iSCSI. So far everything is working just fine except for TRIM/UNMAP. For test puposes I setup two VMs running Ubuntu20.04 in VirtualBox networked together…
CodyMouse
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5
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1 answer

Debian Buster: How to start ZFS after open-iscsi in systemd

I have Debian 10 (Buster) installed and have added ZFS from Backports. I have 4 iSCSI-LUNs that I use as disks for ZFS. Each LUN holds a separate zpool. So far the ZFS setup works. But the system is not reboot-stable. Sometimes after reboot all ZFS…
Christian Rößner
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5
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1 answer

How to use targetcli to disable iSCSI write cache

I have exported a single disk as an iSCSI target using targetcli on a Linux host. On a remote machine I have connected to the device, and placed a ZFS volume on it (as a replication target with zrepl). However any time I reboot the iSCSI target…
Malvineous
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3
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2 answers

Mounting iSCSI targets from 2 different iSCSI target servers on Ubuntu

I have two iSCSI target servers. The iSCSI Initiator is an Ubuntu host (Ubuntu 14.04). I am using Ubuntu's open-iscsi to mount the iSCSI targets from both iSCSI targets servers to my Initiator. The problem is that the symlinks in /dev/disk/by-id…
SQA777
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3
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1 answer

Correctly mounting SAN volumes at boot time

I have a system running Debian Wheezy (7.8) that connects to a storage volume exported via iSCSI using the open-iscsi (version 2.0) software initiator. The iSCSI initiator correctly reconnects the volume at boot time, but it does so after the…
Jules
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3
votes
1 answer

CentOS Client - Unable to Establish iSCSI connection with multiple interfaces on the initiator

So after upgrading to CentOS 6.2, I am seemingly no longer able to login into my iSCSI targets. I have multiple interfaces on different subnets on the system, and I first thought that it had to do with the fact that I may not be binding correct…
slashdot
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2
votes
1 answer

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 is attached to the machine without issue (on…
0xCDCDCDCD
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2
votes
1 answer

Is live migration causing data corruption?

We have two virtual hosts (Xen 4.9) and live migrate guests between them. The storage of the guests is accessible via iSCSI. That is, a guest running on host A has its storage presented as a straight block device, and the device is mounted on host A…
Theo Lassonder
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2
votes
1 answer

low network performance between Citrix XenServer and Linux iSCSI storage

I have two SuperMicro servers directly connected (no switch) by two 10 GBit Intel X540-T2 NIC. One server runs Citrix XenServer 6.2, the other runs Debian 7. I then installed open-iscsi and iscsitarget on the Debian system, configured a 12 GByte RAM…
nn4l
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2
votes
2 answers

iSCSI to NetApp FAS: high latency for write load

Problem A Linux iSCSI initiator is seeing high service times when writing to a NetApp FAS target exposing a bunch of LUNs. Where to look for the cause and how to resolve this? Reproduction I am using iostats and sa from the sysstat package to do the…
the-wabbit
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2
votes
1 answer

iSCSI enterprise target and client both on debian give invalid iniatorname error

I have two Debian Wheezy machines and am trying to set up storage for one of them on the other's disk using iSCSI (they do not have synchronized users, so NFS won't work for this application). I have installed ietd on the server and open-iscsi on…
Jules
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2
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0 answers

Steps to succesfully persistent iSCSI LUN using Open-iSCSI on Ubuntu Server?

Using Ubuntu Linux Server 22.04 minimal edition without GUI, I need some help in mounting the iSCSI LUN using Open-iSCSI so it is mapped to /dev/sdb with the below command: Could you please let me know if I missed any steps on the following: Edit…
Senior Systems Engineer
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2
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1 answer

Proxmox VE: add a LVM storage on top of iSCSI: how to find "base" value for pvesm

I'm using Proxmox VE platform, version 6 or 7, and I'm currently documenting the initial setup with the idea of automating it later. So I'm looking for all command line commands to do all that I must do on the web UI. My problem is in the storage…
daks
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