Questions tagged [storage-area-network]
A SAN is a Storage Area Network, for providing block-level access to storage subsystems across a network.
921
questions
0
votes
1
answer
50
views
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 ...
2
votes
0
answers
24
views
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
...
3
votes
2
answers
98
views
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 ...
1
vote
1
answer
276
views
HP arrray - XP and EVA - performance monitoring
I have some HP arrays I'd like to monitor for performance. I'm making a reasonable amount of progress with my 3PARs, in using ssh connectivity and show... commands to gather performance information ...
1
vote
2
answers
93
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 ...
3
votes
2
answers
132
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 ...
1
vote
1
answer
175
views
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 ...
0
votes
1
answer
567
views
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I see paths that are no longer valid along with valid ones.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 ...
2
votes
1
answer
478
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 ...
0
votes
1
answer
92
views
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 ...
0
votes
2
answers
826
views
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 ...
4
votes
2
answers
2k
views
PAGE_FAULT_IN_NONPAGED_AREA when booting Windows 10 from iSCSI network drive
I am trying to set up Windows 10 for diskless boot via iSCSI, as described, for example, here or here.
I am able to run the Windows 10 installer to install Windows on the target iSCSI drive. However, ...
5
votes
2
answers
271
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, ...
3
votes
1
answer
327
views
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 ...
3
votes
1
answer
214
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 ...
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 ...
0
votes
1
answer
393
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 ...
0
votes
0
answers
312
views
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 ...
7
votes
1
answer
2k
views
Miserable performance of Hyper-V storage on CSV
I recently setup a new environment consisting of:
- QSAN Storage with 10Gib network
- Mellanox switches 10Gib
- 4 x Physical nodes connect to LAN and SAN 10Gib
The physical hosts are connected ...
0
votes
0
answers
54
views
IIS with alternate name in SAN Cert prompts for Credentials
I have a server (server01) running IIS with a Web certificate installed. The certificate has the following SANs -
server01.companyname.com
server02.companyname.com
The binding on Default Web Site ...
1
vote
1
answer
483
views
NFS Datastore Disconnects When sVmotion Migration is Attempted
I have a EMC VNXe 3100 and I had tested both iSCSI and NFS connections from it to my hosts, with NFS appearing to be the better of the two. So I set it up and in my testing with 1 VM everything ...
0
votes
1
answer
59
views
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 ...
2
votes
1
answer
4k
views
how to determine the iscsi target's naa in linux
I understand that iSCSI uses iqn / eui to identify target LUN. Once I have discovered the iSCSI target and logged in is there a way to determine the LUN's NAA id for the remote target from a linux (...
2
votes
1
answer
223
views
Seeking iSCSI file copy flow clarification
I'm trying to diagnose a slow file copy issue but am a bit perplexed by the "behind the scenes" flow of data and am looking for clarification.
The server in question is a Windows 2012 server and it ...
0
votes
1
answer
1k
views
Centos 6.7 Emulex LPE12002 on Dell can't see any targets/LUNS on HP EVA4400 SAN
As the title indicates -- I have a new Dell R730xd running Centos 6.7 with all updates loaded, etc. I also installed the Emulex utilities, etc.
The issue is that nothing I try (reboot / rescan-scsi-...
0
votes
0
answers
93
views
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 ...
3
votes
2
answers
99
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....
1
vote
0
answers
563
views
Celerra: zoning done to data mover
I have a small confusion-while zoning to data mover, wwn zoning in preferred. Which should be Node 50060160c1e10d7d -please correct me if I am wrong.
Because in my environment I see it is zoned to SP ...
2
votes
1
answer
2k
views
Configuring a DELL storage array with both controllers set to the same address
I've gotten hold of a used Dell PowerVault MD1000 with two MD3000i (aka AMP01) controllers, both of which are configured to the same address. However my attempts to configure them - or indeed perform ...
3
votes
0
answers
2k
views
The driver detected a controller error on \Device\Harddisk0\DR0 on a virtual machine
The event in question is generated by a virtual machine.
The disk 0 is a scsi connected drive to the virtual machine.
The vhdx file is in the hyper-v cluster which has the storage from SAN cluster. ...
2
votes
2
answers
2k
views
Cannot join CIFS server to a active directory domain
We have a VNX5700 in our environment , it had two datamovers(one as primary and the other secondary). Recently we added a third datamover to the array and configured it as an active DM , so we will ...
0
votes
2
answers
932
views
HP-UX Boot from SAN
Does anybody knows how to make HP-UX boot from SAN?
Any help would be highly appreciated. I'm totally disappointed by HP's lack of documentation.
The server is RX8640 with HP-UX 11.31
5
votes
4
answers
675
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 ...
3
votes
4
answers
46k
views
iSCSI Transfer Rate Using Standard Gigabit Networking
We just purchased a dell storage server with (12) 7200 RPM SATA drives running RAID 10 and (4) gigabit network interface cards. Additionally it has a PERC H700 controller card with 512MB of on-board ...
1
vote
1
answer
3k
views
Trouble bringing a cloned cluster shared volume disk online
I have a Hyper-V cluster (2008 R2) with a CSV that I want to clone. The CSV is on a fibre channel SAN (HP MSA M3 P2000 G3). I cloned a volume from the SAN side of things, and have mapped it to my ...
3
votes
3
answers
408
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 (...
29
votes
4
answers
48k
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 ...
2
votes
3
answers
2k
views
How to use new disk space after extend attached SAN disk
I have extended the space of my SAN vDisk from 1TB to 1.2TB, but Windows Explorer doesn't show the new size.
After resize the vdisk in the SAN Manager, the Disk Management utility shows the 200GB ...
0
votes
2
answers
683
views
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 ...
2
votes
1
answer
15k
views
SAN: FC vs SAS vs iSCSI
I am currently preparing for an exam.
I thought FC (Fibre Channel) was the transport protocol for SCSI and SAN.
But now I read, that you have to decide if you want to use FC (SCSI), SAS or iSCSI in an ...
3
votes
1
answer
591
views
Software to repliacte data in a Cluster Shared Volume in real time from DAS attached to Server 2k8 R2 HyperV cluster to an identical setup?
Are there any software solutions that will be able to handle replicating the data from one SAS based DAS (a Dell MD3200) attached to two R410 servers running clustered Server 2008 R2 Hyper V instances ...
1
vote
0
answers
614
views
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 ...
1
vote
1
answer
198
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 ...
0
votes
1
answer
776
views
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 ...
0
votes
1
answer
413
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-...
0
votes
1
answer
195
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 ...
1
vote
1
answer
2k
views
Broadcom NIC stays down in iPXE
I'm repurposing some old servers as budget compute farm diskless nodes and am trying to get iPXE to do iSCSI boot on an HP DL145 G3 which has an embedded Broadcom NetXtreme 5715 dual-ported NIC.
...
1
vote
1
answer
728
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).
...
3
votes
2
answers
133
views
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 ...
1
vote
2
answers
1k
views
Windows 2008 R2 Boot-from-SAN Migration Methods?
We are running Windows Server 2008 R2 Enterprise on a Cisco UCS B200 M3 blade server that is diskless. Currently, we are going through a EMC SAN lifecycle/upgrade. I need to perform this migration ...