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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iSCSI issue; "the media is write protected"
i've got some serious issues with w2k8 r2 standard and iSCSI controller. i'm running dell server, connected via ethernet to synergy NAS, which is handling LUN via iSCSI. i'm using ms iSCSI initiator ...
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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 ...
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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. ...
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MPIO on Win Server 2k16 w/ EMC Unity
I have two Dell R630's running Windows Server 2016, slated to be Hyper-V hosts but not yet clustered, attached to an EMC Unity array via fibre channel through a pair of Brocade 300 SAN switches. The ...
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FreeNAS iSCSI use - recommended percentage?
I have set up a FreeNAS system on a Dell R310 server with 4x4TB drives on a cross-flashed H200 controller in FreeNAS' own RAID10. I want to use that storage entirely for VM containers that run on ...
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Command to show storage usage on HP MSA 2040 SAN?
Is there any way to show me the usage on HP MSA2040 SAN storage?
I am searching this for while, but no luck at all. I need to know the usage of the entire SAN storage by just running command from cli ...
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Finding or estimating sequential vs random distribution of existing system (VMware / SAN)
IOMeter testing says the IOPs of the storage subsystem can range from hundreds of IOPs for 100% random loads to tens of thousands IOPs for 100% sequential loads.
Is there any way I can measure or ...
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HP P4500 G2 system board replacement
Initially, I had such a problem: HP P4500 G2 does not turn on. So we buy new system board (spare 583736-001) and when i replace it storage start to power on, but with error code 1611 - Fan Solution ...
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Best practices for migrating to new SAN
My collaborator is splitting from his institute and wants help moving his application and data off the institute's network. And of course things are moving quickly.
He has 12 TB of image data on a ...
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Is WinSAT reliable to test the speed of my iSCSI, Fibre SAN, under bare metal or Virtualized?
I discovered the following command in this whitepaper:
WinSat disk -read -ran -ransize 4096 -drive c
Is it reliable to use against a SAN, or iSCSI drive? I would like to compare the output of ...
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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....
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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
...
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fsck.ext4 complaining that the device is in use. Can't find what exactly is using it
Our setup is a 3-node RHEL 7.3 bare-metal Kubernetes cluster running on Docker.
We have a multipath FC SAN block device discovered on all three nodes. This device is used as a Kubernetes Persistent ...
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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 ...
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hp p2000 iscsi Hyper-V
I currently have an HP P2000 SAN with 2 MSA with 4 iSCSI ports each. Only 2 iSCSI ports per MSA were utilized. One going to each of our SAN Switches and furthermore to our hosts. Throughput has been ...
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Any suggestions on recovering from a 100% utilized vSAN?
I am seeking suggestions and comments on how to recover from a 100% full vSAN (without the obvious, reset to factory option). I have an 8 node ESXi cluster which runs entirely on a vSAN backing. Due ...
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Blade Server Networking Connectivity Solution
We are looking at purchasing 4 of the Dell M1000e Blade Chassis', along with 16x Half Height Servers in each. For our LAN Connection, we are looking at 2x MXL 10/40 GbE IO's per Chassis. From my ...
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setup LVM to combine local and network block devices?
Because my local RAID-based logical volume is not big enough, I am thinking to extend it to a network block device. I am aware that when read/write to the network block device, the performance is ...
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FibreChannel-SAN SCSI-block-devices get lost
There are 3 LUNs on a FC-SAN I want to access using 2 HBAs (with two paths each.
When the system is booted, everything seems fine, but after a while the sd*-devices from the second HBA disappeared ...
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Dell Data Collector Manager not showing Storage Center
In one of our environments, Dell Enterprise Manager Data Collector doesn't seem to connect to my Storage Centre. The logs shows that "Storage Centre Controller Cannot connect to the configured ...
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NetApp filer uses more amps when one power supply is turned off
We have two old NetApp FAS3050 filers at our colo. We also have an upcoming maintenance window that will take our circuits offline for an extended period of time. Our circuits are pretty much maxed ...
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What would cause RMAN backups over NFS to kill SAN performance?
I've been trying to figure out this problem for several weeks now, we are using an Exadata that runs nightly RMAN jobs to backup the database to a NFS mount. When these jobs occur, the average latency ...
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How to configure multipath using Intel X520-SR2 10GB on Oracle Linux 6.2?
I've installed the Intel x520-sr2 Ethernet/Fibre card into a server that has Oracle Linux 6.2 Installed on it. When I boot the server I can go into a QLogic menu (screen has something for Intel on ...
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Clustered file systems as XenServer storage
I want to use shared storage for a XenServer environment with 4 host servers which are running various VMs under XenServer. Planning to use 2 extra servers as storage with high availability of some ...
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SBD killing both cluster nodes when there are even small SAN network problems
I am having problems with stonith SBD in a openais-based cluster.
Some background:
The active/passive cluster has two nodes, node1 and node2. They are configured to provide an NFS service to users. ...
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Volume manager of Windows Server 2008 R2 does not show all iSCSI volumes
We set up a backup server (Windows 2008 r2) for our VMware infrastructure which uses an iSCSI SAN for storage. The backup server has to be connected to the SAN for Veeam to be able to backup virtual ...
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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 ...
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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 ...
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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 ...
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IBM 2005-16B switch console cable
I have an IBM 2005-16B switch, and it has a male serial connector on it, and I want to use that to configure the device.
I also have a usb to male serial cable, and I have recently created a null-...
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Mount the Vplex Virtual Volume ( LUN ) Xen Server
Hello ServerFault members,
Please help me with this issue.
I am in very strange situation with my Xenserver environment. I am trying to mount the Dell EmC ( Vplex LUN ) to the Xen server HA and when ...
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Windows Server guest changes and ramifications after being migrated to SSD?
This particular environment, it's VMWare guests that have been moved to all-flash SAN, but that shouldn't be particularly relevant.
I'm quite familiar with >winsat formal from SO questions like ...
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Dell EqualLogic PS6010E Network Setup
We recently got a PS6010E and going through setup, I put in all the IP info we are planning on using, and when I get to the part where it says to go to http://[group-ip-addr], I am unable to connect. ...
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Xen pool upgrade from 6.5 to 7.6
We are running a XenServer pool on an IBM BladeCenter S with 4 HS22 blades installed. 3 of the blades are in a pool and the fourth not. The blades have no internal storage and all get it from the ...
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Active Directory, 2 Domain Controllers, SAN Storage and Folder Redirection
Greeting's, I'm provided with:
Windows Server 2012 R2 Standard Edition.
SAN block storage (EMC VNXe 1600) with FC connectivity.
2 Blade servers (Dell M630 within M1000e chassis) with FC switch. Each ...
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HP Storageworks disk not recognised
I have inherited an out of warranty HP StorageWorks X1600 G2 SAN with non-genuine HDDs (3T Seagate).
A disk is showing as amber and the 'Array Configuration Utility' says the disk is 'bad or missing'....
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FC persistentvolume: What is the LUN number?
I'm trying to understand how to use fibre channel with OpenShift/Kubernetes persistent volumes.
At https://docs.openshift.com/enterprise/3.1/install_config/persistent_storage/...
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cpu load and nfs performance
I have an issue about nfs performance. The server is connected via an ISCSI connection TO a SAN. I have sometimes and more and more often load picks and client freezes.
I added RAM and try to ...
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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 ...
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How can I distinguish between SAN zoning and LUN assignment issues on RHEL6?
From Red Hat Enterprise Linux 6 how can I tell the difference between a SAN zoning problem (e.g. cannot reach the storage at all) versus a LUN masking issue (e.g. LUNs not assigned to the right HBA ...
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How do I power this SAN safely and with redundancy on the power circuits?
Location: USA
We are looking at powering a new Storage Area Network (VNXe3200).
There are 10 units in total, each with two power supplies for redundancy.
Assuming we can do either single-phase 120V ...
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SCSI queue depth / command queue settings
I two servers with about 100 LUNs presented to each from an IBM V7000 (Storwize). Each LUN has 8 paths - 2 FC ports x 2 FC switches x 2 V7000 heads - so about 800 devices. Devices/paths are managed ...
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Trying to add 2nd iSCSI VDS to XenServer, receiving error about LUN already used by other SR
I've stepped out of my comfort zone here. Some background. I just provisioned a 2nd vdisk+volume on a HP MSA2000. This SAN is has another vdisk+volume linked to Xenserver. I set the mapping to the ...
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Simultaneous server crash in fail over cluster
I have 2 servers in a failover cluster. The cluster defines a shared 'ClusterStorage' drive. The drive maps to a SAN device through iScsi.
Recently, the 2 servers rebooted on their own at the same ...
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Optimum LUN size for LVM created NFS share
I have access to roughly 80 TB of capacity via a SAN, which I want to set up as as 2 NFS shares: 1 share of 70 TB and 1 share of 10 TB. The 10 TB share will have full backup to tape, whereas the 70 TB ...
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Windows Server 2012R2 Backup
We have deployed Windows Server 2012R2, which by using the Windows Server Backup was backup on the drives connected from SAN.
SAN disks connected through multiple paths using Windows Multipath-IO.
...
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brocade 6520 san switch is not supporting in hp storage essential
I was trying "discover" Brocade 6520 SAN SWITCH in HP Storage essential, is not supported
but the same configuration same speed switch "brocade 6510" is able to discover.
how to make brocade 6520 ...
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Does a dead LUN path cause an increase in I/O times on the remaining LUN path(s)?
We use an EMC SAN appliance. There are 2 'paths' from the cluster to the SAN. Today we experienced that one of the LUN paths was 'dead' (as reported in the windows event logs). Presumably the ...
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VMware ESXi extremely slow Virtual disk performance compared to RDM
I have a ESXi 5.5 server running with a FC SAN.
The FC san is created using an openfiler OS with software RAID and exported with the qlatgt driver. Direct writes to this SAN when no VMFS is used work ...
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SSL cert issued to and SAN attribute
I have added a cert to my application cacerts file. The new cert is issued to one DNS(abc.com) and they have added few other DNS(XYZ.com, TEST.com) to the SAN attribute while creating.
I tried ...
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