Questions tagged [iscsi]
iSCSI - SCSI over IP - mount disks across the network
58
questions
5
votes
1
answer
4k
views
Openfiler iSCSI performance
Hoping someone can point me in the right direction with some iSCSI performance issues I'm having. I'm running Openfiler 2.99 on an older ProLiant DL360 G5. Dual Xeon processor, 6GB ECC RAM, Intel ...
- 303
27
votes
7
answers
9k
views
SQL Server disk design on an ISCSI SAN
Its standard practice to separate log and data files to separate disks away from the OS
(tempdb, backups and swap file also)
Does this logic still make sense when your drives are all SAN based and ...
- 2,342
15
votes
7
answers
20k
views
SQL Server Files Local or NAS or SAN?
I have to install a new Server with SQL Server 2008, What do you recommend, One server with Raid 10 or the Files in a NAS?
What about iSCSI should I use it?
What about SAN?
The server has 4Gb of ...
9
votes
4
answers
10k
views
Xen DomU root filesystems becoming read-only on iSCSI virtual IP failover
My Xen servers are openSUSE 11.1 with open-iscsi to our iSCSI SAN cluster. The SAN modules are in an IP failover group behind a virtual IP that the initiators connect to.
In the event that the ...
- 12.3k
9
votes
1
answer
2k
views
Why MPIO instead of 802.3ad Team for iSCSI
Doing my first server to iSCSI target and I thought i would be off to a running start by teaming my NIC on the server (conventional 802.3ad team).
However, from many online sources I see this is NOT ...
- 1,150
7
votes
2
answers
18k
views
Shared access to iSCSI target
Does anyone know how shared access (multiple Initiators) to a single iSCSI target is supposed to work.
I have got it semi-working with Linux (CentOS-7) target and Win 2012 server / Win Hyper-V 2012 ...
- 2,513
7
votes
3
answers
15k
views
How can I use NTFS and iSCSI and not corrupt my SAN?
I know you can't use multiples NTFS machines/servers with the same SAN iSCSI target without corruption. I have multiple servers, however, that need access to the same data on the same SAN.
I do not ...
- 2,348
4
votes
1
answer
939
views
HA configuration for KVM machines installed on shared iSCSI storage
My requirement is to provide HA to a Zimbra Server. We want Zimbra files to be installed in a Netapp SAN which is providing around 5.7 TB as a SAN iSCI Drive. Since Netapp comes in with Dual ...
- 133
4
votes
1
answer
4k
views
iSCSI / SAN / Cluster / multiple NICs failover
Got a problem with NIC failover with iSCSI.
Setup:
A server with 3 NICs. One NIC is local network, other 2 are SAN. Using Microsoft iSCSI Initiator.
A managed network switch.
A QNAP SAN, connected ...
- 67
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 ...
- 2,900
25
votes
15
answers
20k
views
Cheapest iSCSI SAN for Windows 2008/SQL Server clustering?
Are there any production-quality iSCSI SANs suitable for use with Windows Server 2008/SQL Server for failover clustering?
So far, I've only seen Dell's MD3000i, and HP's MSA 2000 (2012i), which both ...
- 1,739
15
votes
3
answers
7k
views
How to crack the 1 Gbit iSCSI limit between ESXi and VNXe
I'm having big troubles with my iSCSI network and can't seem to get it working as fast as it could.
So I've tried pretty much everything to gain full performance from my SAN, having involved ...
- 210
7
votes
2
answers
5k
views
Successful login with iscsiadm on target still doesn't create block device
I've set up an experiment to test iscsitarget and initiator, which at some point worked. Later, I turned the setup back on and much to my dismay, the initiator machine stopped making block devices for ...
- 8,204
7
votes
3
answers
10k
views
Recommended switch for an iSCSI implementation [closed]
We want to implement an iSCSI SAN and all of our testing has shown that we can implement this quite cheaply (Starwind target, refurbished HP Storage array).
What concerns me is the throughput/latency ...
- 255
7
votes
3
answers
15k
views
EMC VNX iSCSI setup - unsure about SP/port assignment
We have a new VNX5300 waiting to get configured, and I need to plan out the network infrastructure before the EMC tech arrives. It has 4x1gbit iSCSI per SP (8 ports in total), and I'd like to get the ...
- 19.7k
6
votes
1
answer
1k
views
Completely disjoint iSCSI networks vs dedicated switches and VLANs
I'm looking for best practice or pros/cons for deploying an iSCSI storage network.
The two options are:
A completely disjoint iSCSI storage network
Dedicated switches with a separate VLAN for ...
- 101k
6
votes
1
answer
2k
views
How to find whether the disk is thin provisioned or not?
I have mapped IScsi volumes into my windows 2016 server. I have created disk out of them. Now i need to find whether the disk is thin provisioned or not.
I am trying with below cmdlets
Get-Disk ...
- 1,311
6
votes
8
answers
14k
views
Can you use your own drives on Dell PowerVault MD3000i?
I would like to use my own drives in the Dell PowerVault MD3000i.
Does anyone know if you are able to?
We are looking at different SANs for our VM farm and would rather be able to replace a drive in ...
Chris
6
votes
7
answers
11k
views
Linux tool/command to check file system performance
What is the simplest way to check read/write performance to a specific location (e.g. a mounted iSCSI device).
I suspect I can't use hdparm because that's lower level. Am I right?
- 2,900
5
votes
4
answers
5k
views
What are the choices for iSCSI target support for Linux?
I recently purchased an IBM BladeCenter E chassis with HS21 blades. I'd like to build a SAN so the HS21 blades will have more storage space.
From everything I've read, iSCSI seems to be the best ...
- 437
5
votes
1
answer
3k
views
Dedicated NIC or dedicated port for iSCSI?
When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That ...
- 1,872
5
votes
5
answers
3k
views
Mixing SAN iSCSI Traffic with core network traffic, Am I asking for trouble?
I am configuring a new network and had a couple questions I am finding hard to find good answers about best practices on using VLANs to separate Core network traffic and iSCSI traffic.
The switches ...
- 95
5
votes
5
answers
37k
views
Disk IO slow on ESXi, even slower on a VM (freeNAS + iSCSI)
I have a server with ESXi 5 and iSCSI attached network storage. The storage server has 4x1Tb SATA II disks in Raid-Z on freenas 8.0.4. Those two machines are connected to each other with Gigabit ...
- 601
4
votes
1
answer
698
views
ESXi 5x: Changing number of IOPS per path sees dramatic improvements
I'm a bit embarrassed that I've never seen or used the -iops parameter as part of the esxcli deviceconfig options.
I stumbled upon an article and proceeded to benchmark before and after using various ...
- 14k
4
votes
2
answers
4k
views
enabling jumbo frames on an iSCSI network after the fact
We're using iSCSI storage and have two dedicated VLANs for iSCSi. We didn't implement jumbo frames initially. I'd like to turn it on now. I understand I need to turn it on for the NICs that connect to ...
- 4,878
4
votes
6
answers
1k
views
Which storage protocol to use for ESX storage?
What storage connection method should one prefer to use for connecting ESX servers to a shared storage server with 10GbE links?
Speficically, I have 2 ESX servers for VMware ESX and one server for ...
- 1,056
4
votes
6
answers
8k
views
NexentaStor CE or Openfiler? Which do you recommend? [closed]
I'm planning to implement a 'poor man's storage' using Openfiler or NexentaStor CE.
I need the filer solution to provide iSCSI target and CIFS sharing abilities. The iSCSI target and CIFS share will ...
- 5,138
4
votes
5
answers
1k
views
Decent 1gb switch (16-24 port) for rack
For a rack containing a smaller nubmer of servers (5 at the moment, going to stay in this area), I am looking to replace the currently aging 100Mbit switch with a 1Gb switch.
This is for the backend ...
- 51.9k
4
votes
2
answers
4k
views
10Gb ISCSI to 1Gb server port
I have this setup in mind.
Md3800i 4 10GBps Iscsi.
2 del r730 4 1Gbps ports.
I will use this storage to backups and low profile mass storage.
So i don't won't to put HBAs in the server.
Looking ...
3
votes
1
answer
3k
views
SAN: is it better to have separate LUNs for operating system and data of virtual machines? [closed]
We have an iSCSI SAN that will be used as backing store for virtual machines. We use Xen and will directly present the LUNs as block devices of VMs (so there is no file system with files on it for ...
- 5,886
3
votes
5
answers
5k
views
Shrink NTFS Partition Windows 2003
We have an iSCSI target provided by a CentOS server attached to a Windows Server 2003 Standard box, formatted in NTFS.
My question is this - I know we can resize the backend block device fine (LVM et ...
- 6,105
3
votes
2
answers
2k
views
Are there any benefits to using a Distributed vSwitch for iSCSI?
I am designing our vSphere farm - we'll be migrating from ESX 3.5 to 4.1. I plan to set up a new farm using ESXi 4.1, and move the Virtual Machines on the 3.5 farm into it by shutdown, then import.
...
- 9,714
3
votes
4
answers
4k
views
VMware NAS/iSCSI recommendations - smallish organization
I have two VMware servers - ESX + ESXi. Two backup NAS boxes. The current
NAS boxes are low-cost and unsuitable for running VMs from. Support NFS only. Slow.
My plan is to have a dedicated iSCSI/NAS ...
- 415
3
votes
2
answers
6k
views
ISCSI drive not mounting for use in windows server 2012
I Have IBM Storvize SAN device , which is the ISCSI target .
The IScSi initiator on the host windows server 2012 , is showing the status as connected to the volume on the san.
When the initiator ...
- 31
3
votes
1
answer
7k
views
Using same drive for iSCSI and SMB share under FreeNAS
I'm setting up a new FreeNAS server this weekend with pretty good success, but I am stuck on one last issue.
Right now I have 2x 1.5 TB drives that I want mirrored (I was planning Software RAID 1) ...
user19588
3
votes
1
answer
3k
views
Enable Flow Control on a VMware vSwitch
I can't figure out how to enable Flow Control on a VMware vSwitch. I've been talking with Equallogic and VMware, and they said we need it on for better performance. I can't find out how to enable it ...
- 1,102
3
votes
1
answer
3k
views
iSCSI SAN - Network adapter bottleneck
My new database server (Windows Server 2008 R2) has a 4 Gbps connection to my Dell EqualLogic iSCSI SAN. I've been testing it by backing up multiple databases at the same time. There appears to be a ...
- 175
3
votes
6
answers
9k
views
iSCSI Distributed RAID?
Thinking about setting-up as distributed RAID array over iSCSI. Has anyone else tried this, if so what was your experience.
To be more specific I am thinking of a couple of CentOS servers each with ...
- 2,513
3
votes
3
answers
8k
views
How to best tune Dell PowerVault MD3600i SAN/Initiators for best performance?
Recent owner of a Dell PowerVault MD3600i i'm experiencing some weird results.
I have a dedicated 24x 10GbE Switch (PowerConnect 8024), setup to jumbo frames 9K.
The MD3600 has 2 RAID controllers, ...
- 1,451
3
votes
1
answer
1k
views
Second NIC "not working properly" on diskless Server 2012
I've got (after a considerable fight) a diskless Server 2012 running via the MS software iSCSI initiator being booted via gPXE chained from the NIC's PXE.
However, now that it is booting properly I ...
- 1,628
2
votes
2
answers
5k
views
What is the maximum number of iSCSI connections that Server 2012 R2 can initiate?
I found online that Server 2008 R2 host can only initiate a maximum of 255 iSCSI connections, and that it was a hard limit within the OS itself.
Does this same restriction apply to Server 2012 R2?
...
- 257
2
votes
1
answer
4k
views
Is it possible to create a multipath iSCSI target with two DRBD nodes?
I can put together two linux servers and use the (more or less) new DRBD dual-primary feature to get a shared block device with concurrent read/write access on the two nodes.
Can I then export an ...
- 5,886
2
votes
1
answer
578
views
Windows 7 routing traffic through the gateway for local addresses
Windows is adding a route for a local address (10.0.0.90 - my fileserver) with a gateway of (10.0.0.138 - this is my gateway), the gateway only has a 100Mbs link so all of my fileserver bound traffic ...
- 171
2
votes
2
answers
9k
views
Specifying a preferred route when there are multiple links to same network
I have a server with multiple interfaces and IP addresses on the same network. I would like for non-iSCSI traffic to exclusively use one of the interfaces, and for iSCSI traffic to exclusively use the ...
- 12.8k
2
votes
1
answer
2k
views
Windows Server 2003 forgets folder shares from ISCSI-Volume after restart
I have running a Server 2003 with the Microsoft ISCSI Initiator. I mapped an ISCSI-Volume and after the restart of the server, the the folders aren't shared anymore. The NTFS-rights are still rigth ...
- 57
2
votes
6
answers
2k
views
Will the OS crash if the system partition can't be access for a short period?
An operating system is installed in a virtual machine environment, such as VMWare or KVM. A network shared disk volume (e.g., iSCSI disk) is used as the OS system partition. Heavy traffic is running ...
- 205
2
votes
5
answers
7k
views
Back up Windows 2008 SBS to iSCSI disk
I've almost no experience with SBS 2008, so please excuse my noob question!
SBS 2008 only has the most basic backup utility built in as far as I can tell (similar to Vista), and it will only back up ...
- 69.1k
1
vote
1
answer
3k
views
Log in to a single LUN of a target with iscsiadm (open-iscsi)?
Is it possible to connect to only a single LUN of an iscsi target when using iscsiadm? I have a target like "iqn.0000-00.iscsi.foo:bar" this target has 1000 LUN's. If I do iscsiadm -m node -l -T iqn....
- 216
1
vote
1
answer
763
views
How does 'virsh' determine (iscsi) unit names and can they be changed?
I've got a kvm host running that has and iscsi backed storage pool:
virsh # pool-info mypool
Name: mypool
UUID: 913210f2-f8a0-4a56-b7bf-ef00b0080ee1
State: running
...
- 333
1
vote
4
answers
7k
views
Benefits of iSCSI over FTP or SMB
I was wondering if there are any major advantages of using the iSCSI protocol to access a NAS over a connection via FTP or SMB (besides access speeds, which would be higher with the use of the iSCSI ...
- 129