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Questions tagged [storage-area-network]

A SAN is a Storage Area Network, for providing block-level access to storage subsystems across a network.

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Enterprise Hypervisors Architecture [closed]

I recently started working as a sys admin in a new company. The infrastructure is a mess, they are using a libvirt KVM hypervisor solution without an interface, and the storage for the servers is ...
Fred ASTER's user avatar
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Device mapper multipath vs kpartx

Schema: Linux servers on Debian 10 connected into 2 SAN Fabrics, i presented 3 LUNs from HPE MSA 2060. Task: Correct setup multipath for presented LUN, do i needed use after multipath -i command ...
aad7's user avatar
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2 votes
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fio gives an unexpected IOPS number

While running tests with fio, we encountered unexpected behavior of it. Test config: [global] iodepth=64 direct=1 ioengine=libaio group_reporting time_based runtime=6000 numjobs=1 rw=randrw ...
it800's user avatar
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3 votes
2 answers
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Moving Windows file server contents from one iSCSI LUN to another

Good day, I have a fileserver role on a Win2016 Failover Cluster backed by an NTFS volume on an iSCSI LUN. I need to move its contents to another iSCSI LUN, on another block storage system. The ...
Cat Mucius's user avatar
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1 answer
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SAN VLAN configuration

I'm repurposing an old SAN device for some additional non-critical storage on a VM on a 3-host S2D cluster. I can't dedicate the switches at the moment like what seems to be recommended so I need some ...
Crimsonfox's user avatar
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2 answers
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Server's Disk Queue Length is high, but Disk Bytes/sec is lower than it's capable of

I have an environment running SQL Server on a Windows VMWare platform using a SAN with SSDs set up in RAID 6, and using Veeam for server backups and LiteSpeed for SQL Server backups. I've had a ...
Ben Rubin's user avatar
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1 vote
1 answer
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How a failover in Active/Passive SAN multipath should be properly handled on Linux multipath system?

I try to create a multipath configuration with SAN HPE EVA 6350 (2xHSV340 controllers with iSCSI mezzanines and FC/iSCSI multiplexers) and Linux debian 12 systems over iSCSI. Vdisks created on EVA ...
olegkrutov's user avatar
5 votes
2 answers
289 views

Am I doing this wrong? Networking - High Availability: SAN, MSFT Failover Cluster, NIC Teaming

I have been working in a lab environment to figure out how to design a SAN with a Microsoft failover cluster using multiple NICs, MPIO and iSCSI. I'll try to add as much useful information as I can, ...
DOSed_And_Confused's user avatar
3 votes
1 answer
227 views

Howto: Block or File replication across 3+ nodes without a SAN

The setup I admin the backend for a website that currently exists on a single node using Nginx (webserver), Neo4J (database) and Wildfly (app server). The website is getting enough traffic that we ...
SiegeX's user avatar
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1 answer
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Non-valid paths in "multipath -ll" output

I see paths that are no longer valid along with valid ones. How do I prevent them showing up in the output. I expect four valid paths. The volume was earlier exported with LUN 13 and later 14 which ...
Hem's user avatar
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LVM disk is corrupt - is any data recoverable?

Under RHEL7 we have a logical volume consisting of 27 volume groups PVs. Each of these VGsPVs was added sequentially as we ran out of space on the LV. We do not have a backup of the data. There are ...
tmark's user avatar
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Simplest way to tell if two logical drives on the same device?

What is the simplest way to determine whether 2 logical drives are on the same device? I have access to remote into the server, but the hosting company isn't reasonably accessible for me to ask the ...
BVernon's user avatar
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1 answer
429 views

Brocade FabricOS 8.2.2d: "rbash: setcontext: command not found" through SSH

Context: I’m writing a script that monitors all SFPs on a Brocade SAN switch and needs to iterate over all FabricID contexts. When I log into a FabricOS 8.2.2d (also with 9.0.1) device through SSH ...
breversa's user avatar
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1 answer
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highly available storage over infiniband: what other than mdraid?

is mdadm over infiniband a bad idea? what is the real trick to get reasonable performing storage to survive a single machine failure? We have been running ceph for a few years now and its great for ...
aep's user avatar
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2 votes
1 answer
502 views

Cannot get over 100k iops from storage on 10g network on 4k random blocks

My setup description: storage system for vm storage: supermicro server, 1-socket Xeon E5-2620 v4, 82599ES-intel-based RA-Link 10GE network adapter, 8x pci-e 2.0, plugged in 8x pci-e 3.0 slot, debian ...
John Kraft's user avatar
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Cisco MDS zoning a physical server

I'm new to zoning using Cisco MDS (9250i) to a Cisco UCS and was shadowing one of my colleague. I noticed he used the WWPN of the Linux server output systool command. I logged in to the CIMC and ...
Silverburg's user avatar
3 votes
2 answers
101 views

SAN Solution for diverse VM Servers

I recently got my fingers into Server Administration. I am currently the only person administering an air gapped network with 8 sites. Most things are dated and old but I get the money to renew things....
Auberginer's user avatar
1 vote
2 answers
98 views

Is quorum disk required for standalone installations?

A provider is setting up a single bare-metal Oracle server for us, which will not be part of any grid or cluster. It has over 20 disks connected via fiber to a SAN, each 1TB. OVM is installed on a ...
miturbe's user avatar
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5 votes
4 answers
706 views

How to plan SAN Storage?

I'm pretty new to the whole SAN thing and am trying to wrap my head around some fundamentals. We are trying to build up a Hyper-V Cluster with two Servers and some external storage media like an HPE ...
P.Dossis's user avatar
3 votes
2 answers
1k views

Poor Cluster Shared Volume performance when node is not CSV owner

We have a 5 node Windows Server 2016 Failover Cluster setup using an HPE Nimble as shared storage. We're using the cluster for Hyper-V. All virtual machine VHDXs are stored on the cluster shared ...
siu07's user avatar
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3 votes
3 answers
411 views

ZFS and SAN: issue with data scrubbing

Working as scientists in a corporate environment, we are provided with storage resources from a SAN within an Ubuntu 20.04 virtual machine (Proxmox). The SAN controller is passed directly to the VM (...
Benoit's user avatar
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Dell Equallogic PS 6210 is not Booting up After Power Outage

Our EqualLogic PS 6210 is not booting up properly after the power outage, unfortunately it is not under warranty We can power it on, the disks are blinking and both controller is powered on (but ...
Jabi's user avatar
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High Load Average in Solaris Operating System - Due to high read I/O

In Linux OS, the load average is dependent on multiple factors like CPU utilization, number of uninterruptible sleep processes, and others. On the other hand, Solaris OS load average is dependent on ...
cybermizz's user avatar
1 vote
1 answer
206 views

Factually Btrfs is it suitable for block storage usage?

It exists various storage device, file, block and object based. Some filesystem are dedicated to a kind of device. what about Btrfs ? Here I would like to get some technical facts about Btrfs over a ...
bioinfornatics's user avatar
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1 answer
429 views

Single SAN with ocfs2 and gfs2

I have a single SAN with two virtual drives. (i.e., they are separate mounts, but they are mapped to the same IP address) For example, if I do ls /dev/disk/by-path/, I see this: ip-172.16.100.5:3260-...
Ray's user avatar
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1 answer
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iSCSI separation from Ethernet via VLAN

I've set up a small cluster of a few servers along with a SAN. The servers are running Ubuntu 20.04 LTS. Using instructions provided by the vendor (I can't find where I read it before), they ...
Ray's user avatar
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1 answer
202 views

JBOD hard drives report incorrect size

I am trying to setup a netapp ds14 to use with 6 and 8tb SATA drives I got FC to SATA interposer boards and now all the drives are correctly identified and visible, however the capacity that I see is ...
Anton Banchev's user avatar
1 vote
1 answer
765 views

How to make Linux discover new LUNs from Pure Storage FlashArray//X70 R3?

When a new LUNs are presented to Fibre Channel SAN from a Pure Storage FlashArray//X70 R3, Linux (SLES) does not find those (as opposed to other FC storage systems like the HP EVA or 3PAR StorServ). ...
U. Windl's user avatar
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3 votes
2 answers
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Query about Thin Provisioning and Thick Provisioning

If i have storage LUN created as thin provisioned and mapped it to VMware Datastore. From that Datastore thick eager VMDK allocated to VM. Does this action reserve VMDK capacity on Backend Storage and ...
Ankit's user avatar
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1 answer
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What kind of operating system SAN device can have?

Ciao, I don't understand does SAN device have an operating system? I know it is connected to servers in data center by san switch and it provides data drives to the servers but how the server ...
Bro Pana's user avatar
0 votes
1 answer
201 views

RAID 0 for Development

Hello fellow administrators, I am seeking high level guidance on the following situation: First the context of the environment: internal, all virtual (vmware), development use only, performance ...
birchmeier's user avatar
4 votes
2 answers
310 views

How does SAN provides block access to data?

I was reading about file storage and that lead me to SAN. I read about SAN and that it provides block access to data. I was looking for these concepts in some video, where the guy creates a VM on some ...
rahul sharma's user avatar
1 vote
0 answers
64 views

Best Practice: Ansys FEA Output Data Storage

I'm trying to make this as least subjective as possible by providing finite inputs and parameters. I truly want to know what is the most resource affective, given the constraints. Given my available ...
illestGnome's user avatar
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1 answer
743 views

DS3400 - no access - only ping via management ethernet port

This is my first post, so sorry if I `ll miss something My task is to collect data from few years old DS3400+EXP3000 ( it was disconnected from power last 2 years). After starting it on front panels ...
Bartek's user avatar
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0 votes
1 answer
847 views

Can we mount single SAN block level storage are on two separate VMs having different OSs

We have one VM having HP-UX, on which a storage area is already mounted from SAN as block level vxfs. We need to share the same storage area on another VM in real-time read-only mode but we can only ...
6nagi9's user avatar
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0 votes
2 answers
3k views

Best free software solution for homemade iSCSI SAN [closed]

I currently have a NAS running ZFS on Ubuntu but have recently changed my main windows software to pool local drives using Stablebit DrivePool. I cannot include networked drives in DrivePool unless ...
AnimeAi's user avatar
  • 27
2 votes
1 answer
1k views

NFS: Single filesystem mount versus multiple mounts of sub directories

We have a file server (fsrv1) that has a 3 mounted XFS filesystems /srv/xfs{1,2,3} each with 3 top-level directories: /home, /scratch and /project. What is the preferred approach to mounting this on a ...
Vince's user avatar
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3 votes
2 answers
141 views

Multipath in linux for 2 HPE 3PAR replicated storage devices

We are trying to have an HA multipath where from 1 Server (Linux Fedora OS), we connect to 2 different storage devices (HPE 3Par Storage) that are synchronously replicated. Our idea is that in case ...
carrotcakeslayer's user avatar
0 votes
1 answer
19 views

SAN Connectivity Extension from one Building to Other with 350 Meters distance Recommendations

We have two Data centers, DataCenter-A has all the Backup storage, Datacenter-b has critical servers, We need to backup Datacenter-b Servers via FiberNetwork. We have Brocade 300 Switches on DC-a &...
jas's user avatar
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5 votes
3 answers
603 views

"Bad message" with a new SAN using multipath and iSCSI

I'm configuring a new SAN for a set of Ubuntu 18.04-based servers. Each of nodes can mount the ext4 formatted partition fine. Being new to both multipath and iSCSI, I'm not sure if what I'm seeing is ...
Ray's user avatar
  • 167
0 votes
1 answer
108 views

Multi domain SSL shows all the domains publicly

We have generated Multi-domain SSL for my clients but when visiting any client site If we click on the lock icon and navigate to certificate details can see other client domain names in the subject ...
Ramjith Ap's user avatar
6 votes
1 answer
4k views

can I share the same datastore between different VMware 6.5 clusters?

Is it possible to share the same datastore between multiple VMware clusters of the same version (both 6.5 or both 6.7)? It is the norm to share the datastore between multiple hosts in the same ...
Luke404's user avatar
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0 votes
1 answer
48 views

Should i partion 100% of my san's HDD's or leave some unused?

I am new to posting here but have been reading and utilizing your extreme brains over the years so Thank you all for being so generous!! I just bought a new Synology NAS for my domain and i am ...
Steven Cole's user avatar
3 votes
2 answers
242 views

Kubernetes cluster shared storage and backup solutions

Which shared storage solutions are common for Kubernetes cluster to implement shared storage persistence for containers? NFS on NAS / iSCSI somehow? How do you backup the data on a Kubernetes with ...
jwalker's user avatar
  • 108
8 votes
1 answer
607 views

Can I dynamically expose an entire SCSI host over Fibre Channel, preferably in Linux

Is it possible to expose an entire SCSI host dynamically (an LSI HBA or RAID card) over Fibre Channel, if so how? Preferably on Linux (perhaps targetcli) and with disk hotplugging support. (i.e. ...
Charlie Camilleri's user avatar
5 votes
3 answers
5k views

What differences are between a NAS, a shared disk file system on a SAN, and a distributed filesystem?

https://en.wikipedia.org/wiki/Clustered_file_system#Network-attached_storage says Network-attached storage (NAS) provides both storage and a file system, like a shared disk file system on top of a ...
Tim's user avatar
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14 votes
1 answer
6k views

Linux goes to swap while plenty of RAM installed

I have a linux box that is used as SAN storage. It is equipped with 14 SATA HDDs and the only software it run is iscsi target and zabbix agent. This is physical box, not VM. The RAM size installed is ...
Kevin M's user avatar
  • 299
0 votes
1 answer
628 views

SAN volumes not showing in new cluster

Some background.... We have Two hyper-v hosts running server 2012r2 with a number of guests. Msa1040 SAN with two disk pools The hosts are a two server cluster The two hosts connect to the san via ...
Pete Matthews's user avatar
0 votes
1 answer
164 views

3PAR 7400 cli setup

Unfortunatelly we don't have a GUI so we use cli. How to allocate physical disk space to free space? I tried servicemag, admithw,admitpd cmd but freespace (showspace) is equal 0 3PAR01 cli% showsys ...
Dmitry's user avatar
  • 1
0 votes
1 answer
648 views

Configuring MPIO on Windows to remove duplicate disks

We have shared some storage from a EMC Unity SAN to Windows Server 2012 R2 to use with Veeam. In Disk Management, there are multiple disks listed with the same size. From previous systems, this is ...
neildeadman's user avatar

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