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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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10k views

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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0answers
220 views

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 ...
3
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0answers
355 views

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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0answers
148 views

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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0answers
76 views

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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0answers
65 views

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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0answers
204 views

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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0answers
1k views

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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0answers
186 views

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 ...
2
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0answers
1k views

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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0answers
3k views

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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11 views

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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0answers
15 views

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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0answers
19 views

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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0answers
12 views

3par OS location

As a complete 3par Newbie I have a simple question about the OS of the Storage-System. Is the OS on a 3par stored on it's controllers or on Disks like in some EMC-Models. When I have an empty 3par-...
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0answers
134 views

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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0answers
119 views

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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0answers
89 views

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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0answers
169 views

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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0answers
766 views

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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0answers
569 views

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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58 views

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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0answers
253 views

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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0answers
494 views

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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0answers
132 views

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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0answers
238 views

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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0answers
44 views

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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0answers
424 views

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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0answers
1k views

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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0answers
286 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 ...
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0answers
91 views

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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0answers
32 views

Xen: resizing underlying iSCSI SAN volume

I have a SAN volume that provides the storage for 3 machines running Xen 6.2. The volume is down to about 10% free but there is more available unallocated. The SAN (Equallogic) supports volume ...
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0answers
210 views

HP LeftHand StoreVirtual VSA host affinity

I am testing the HP LeftHand StoreVirtual VSA for ESXi 5.x (a 3 nodes setup, hosting the VMs in the same hosts that have the VSA appliances). Is there a way to define some sort of 'ESXi host to VSA ...
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0answers
139 views

Mapping LUNs to drive slots on a MSA2312i?

I'm working with an older MSA2312i. I really need map the current LUN configuration to associated slots via the SSH so I can make it scriptable. Is there a ready way to do so? I would have thought a ...
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0answers
122 views

What technical issues should I be aware of when re-mapping a LUN from one host to another?

I inherited an IBM System Storage DS4000 SAN with an AIX environment running Oracle RAC (3 nodes). One of the nodes crashed, so I got the system up and running with 2 nodes; however, the node that ...
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0answers
40 views

WS2003 network drive gets deactivated after restart

windows server 2003 OS runs sql backups regularly and periodically i have to restart once in a while. when the restart takes place the network drive(H) becomes deactivated which i do not understand ...
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0answers
180 views

Running SpinRite on SAN attached LUN with NTFS corruption

Got a customer that has an issue with NTFS corruption that is popping up on SAN attached storage. The LUN is RAID-10 (4:1 spindle ratio). The machines are Windows Server 2003 (64-bit), and they are ...
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0answers
117 views

multipath -l vs -ll

What system information is multipath -ll reading that multipath -l does not? From the RHEL DM Multipath Guide -l Display the current multipath configuration gathered from sysfs and the device ...
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0answers
587 views

Dell Equallogic SAN - 4000 series to 6000 series connectivity issues

I have a 4000 series in production with two physical NICs and a group IP. I have a 6000 series in a DR site with four physical NICs and a group IP. 4000 series NIC1: 10.0.12.2 4000 series NIC2: 10.0....
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0answers
593 views

XenServer Offsite Replication

I am trying to find the best way to migrate my VHD's to my DataCenter offsite for DR purposes. Currently I have a number of Xen Stacks setup as the following: Dual RAID ISCSI SAN multipathed to at ...
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0answers
742 views

Replacing LeftHand SAN Hard Disk Outside of Warranty / Service Contract

I am working with 3 clusters of LefHand SAN iSCSI storage arrays. The modules are all older NSM 150s and NSM 160s (super micro server hardware, sata disks). The workload is low priority and all ...
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0answers
226 views

Rebuilding a SAN

Because of a mistake in adding disks earlier, I am going to rebuild my SAN. It is an HP MSA2000, and I am using 2 Windows Server 2008 servers in a cluster. Please review my plan and let me know if I ...
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0answers
533 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 ...
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0answers
60 views

Windows Server 2016 UEFI Boot issue

I am trying to get a fresh install of Windows Server 2016 working on UCS B-Series blade with UEFI and boot from SAN and seem to be hitting a brick wall. The OS installs and I can see the Windows Boot ...
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0answers
27 views

Spinning up disks in FC shelf

I own an Engenio 4600 FC shelf, which works apart from flaws regarding missing diagnostics pages quite well as a JBOD in combination with Linux and ZFS. The only problem I need to solve is if I ...
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0answers
92 views

Will replacing disks one at a time end up increasing the total available storage on a Dell Compellent SAN?

Short Version Can I hot-swap disks in a Dell Compellent StorageCenter SAN with larger ones (one at a time, allowing them to rebuild between each change) and end up with more total available storage? ...
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0answers
34 views

virtualized filer configuration for Win 2008r2 for 7 TB of data

I'm using Hyper-V on 2008 R2 and I have to serve about 7 TB of network shares through SMB. The underlying storage is a SAN. I planned two configurations: self contained Windows 2008R2 guest of 7TB. ...
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0answers
389 views

Automatic backup of brocade switch FC configuration

What is the best way to set up automatic backup for switch FC configuration? I have searched the web and came across https://code.google.com/archive/p/save-simply-your-san/ , but it looks like it ...
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0answers
42 views

No w/s in iostat output even though wMB/s is high

I am trying to format a 2 TB SAN based block device (/dev/mapper/mpathb). Even though, mke2fs has been running since over one hour without completing, iostat -z -x -m 10 output in a separate terminal ...
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0answers
165 views

Backup strategy for LVM file sytem on NFS file server connected to SAN

I have setup a server (CentOS) on which I have connected to several LUNs from a SAN via iSCSI then multipath, resulting in multiple physical volumes I can use for LVM (dm1 ...). From the file server, ...