iSCSI - SCSI over IP - mount disks across the network

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3
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1answer
2k 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 ...
25
votes
7answers
7k 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 ...
7
votes
4answers
7k 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 ...
13
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7answers
11k 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 ...
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2answers
1k 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 ...
1
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1answer
2k views

iSCSI / SAN / Cluster / multiple NICs failover problem

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 ...
25
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15answers
18k 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 ...
22
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3answers
16k 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 ...
13
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1answer
295 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 ...
7
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3answers
7k 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 ...
4
votes
6answers
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 ...
4
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5answers
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 ...
3
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3answers
4k 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, ...
3
votes
6answers
6k 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 ...
4
votes
4answers
19k 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 ...
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vote
2answers
2k views

Dell PowerVault MD3200i dm-multipath configuration and performance snags in Debian 6.0 (squeeze)

I'll be using this iSCSI target for a couple of Debian-based KVM virtual machine hosts. Each of the target's redundant controllers has 4 ethernet ports; likewise for the initiators. I use two switches ...
7
votes
2answers
245 views

iSCSI using uplink ports on switch

Do the uplink ports on switches typically work okay as iSCSI ports? We're adding a 10gb iSCSI SAN, and want to get a combo switch (48x1gb & 4x10gb SFP+ uplink ports) and use the 10gb for the iSCSI ...
4
votes
1answer
217 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 ...
4
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7answers
2k 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?
3
votes
1answer
403 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 ...
3
votes
4answers
3k 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 ...
2
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2answers
3k 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 ...
6
votes
1answer
414 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 ...
6
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3answers
7k 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 ...
5
votes
1answer
750 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 ...
5
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3answers
5k 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 ...
3
votes
1answer
2k 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 ...
3
votes
2answers
743 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. ...
3
votes
2answers
2k 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 ...
2
votes
1answer
207 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 ...
2
votes
1answer
341 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 ...
2
votes
4answers
2k 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 ...
2
votes
1answer
3k 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) ...
2
votes
5answers
6k 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 ...
1
vote
1answer
3k views

How can I mount a XenServer VHD from an iSCSI SR in Ubuntu?

I need to get files from a Linux VM that was hosted on an iSCSI volume attached to a XenServer host, but I no longer have any XS hosts around (they've all been converted to VMware). I've already ...
1
vote
6answers
956 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 ...
1
vote
5answers
637 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 ...
0
votes
1answer
162 views

iSCSI - what's faster?

I have a DroboPro that is currently connected to a GS748TS switch. Also connected to the switch is a server and few workstations. Which method would be better in performance? Add a NIC to the ...