In EMC Proven Solution testing for a given use case, I have come across a serious issue in relation to iSCSI responses, which inheritently causes slow storage response times, very slow cluster polling and enumeration. Test config Windows R2 with Hyper-V. They would time out as they passed their default pending and deadlock time-outs.
Firstly, when you online, refresh or failover a VM configuration, Hyper-V performs a sanity check to ensure the underlying components of the VM network, storage, etc are available. This means scanning all the disks.
This brought the online time from 10 minutes to 19 seconds! Result…or maybe…. I needed to fully understand the issue, so out came WireShark in order run some Ethernet traces…. Windows onwards, the default TCP acknowledge time is ms. This means that if a TCP segment bytes is not full, it may need to wait up to ms before the data actually sent from the Windows host. It does this sequentially, at least twice for each disk involved in the virtual machine.
This means for each SCSI command we attempt to send to storage target and target LUNwe will typically end up waiting for the ms timer! But…for iSCSI Networks, this should not really be of concern because by best practice, you should have isolated iSCSI networks with minimal hops between host and storage.
This by-passes the Nagle Algorithm completely for that process, so you dont need to even wait for that 1ms seems a short time, but it is still a trigger time — the SCSI command will fire immediately. I have a design change request in for Microsoft to consider this as the way forward. Probably wont see it until Windows 8, but hey! You can follow any responses to this entry through the RSS 2.
You can leave a responseor trackback from your own site. James, Great post! Does this reg change require a reboot of the hyperv host? This great article from James explains the inner workings behind it.
This Microsoft KB article cements the recommended […]. You are commenting using your WordPress.The TS-x79 series Turbo NAS offers class-leading system architecture matched with 10 GbE networking performance designed to meet the needs of demanding server virtualization. Use another vmnic to connect to the data. If you just want to have one LUN as a datastore, you are recommended to implement no more than 10 virtual machines per datastore.
The actual number of VMs allowed may vary depending on the environment. Administrative operations, such as creating or deleting a virtual disk, extending a VMFS volume, or creating or deleting snapshots, result in metadata updates to the file system using locks, and thus result in SCSI reservations. Login the web administration page of the Turbo NAS. Configure standalone network settings for Ethernet 1 and Ethernet 2.
Run VMware vSphere Client and select the host. Select the host. Then, select the dedicate path After a few seconds, you will see the datastore in the ESXi server. Right click the host to create a new virtual machine, select VMdatastore as its destination storage.
Follow the wizard to add a new hard disk. All the VM settings have been finished. If you have any further questions about QNAP products or solutions, contact customer service through the Service Portal. For normal datastore, limit the number of VMs per datastore to 10 If you just want to have one LUN as a datastore, you are recommended to implement no more than 10 virtual machines per datastore.
Ethernet 1 IP: Repeat the above steps to set up the preferred path Create your VM and store it in the VM datastore Right click the host to create a new virtual machine, select VMdatastore as its destination storage.
After a few seconds, a new hard disk will be added on your VM. Thank you for your feedback. HelloWelcome! You can start using a variety of QNAP member services. Software Store Get licenses for advanced features from our Software Store. Console management not necessary. A dedicated interface for VM datastore. Network Interface. Ethernet 1. Ethernet 2. Ethernet 3.Privacy Terms. Quick links. Post Reply. At present the network is using unmanaged switches, however I'll be upgrading to a HP G and a G in the near future.
I'm also going to be implementing Veeam backup and recovery as the backup solution and am looking at possibly using LUNS on the QNAPs as the Backup repositories as opposed to USB3 external drives connected to the physical backup server. The visualization environment is underutilized at the moment but plans involve ramping up the number of VMs as we centralize applications and data.
If yes, to what version? I've seen some of the back and forth regarding the 4x firmwares All of the info I've been able to find on these builds focuses on improvements to the UI and home-use functions, which leads me to believe that I may be best served by the most recent 3.
Issue 2: Networking - With an eye towards performance and security, my plan at the moment is to put the QNAPS, the ESXi storage interfaces and the physical Veeam server in their own VLAN to keep the storage network isolated from the client devices and any potential nastiness that could happen there. Can someone point me towards the pros and cons of To my mind there's a bottleneck somewhere that I'm not seeing or I've got something misconfigured.
My money's on the latter option Thanks. This HDD's is for primary make backups. If you want to tune make a RAID 10!I have one similar case. A customer that needed tons of storage just for archive some years ago. Just pointing out another option: you can set up a file share on the QNAP.
Does it have to go through the Windows Server? I ll probably have to back it up using that option. Not sure how that is setup yet but backups is on my mind and will be implemented as part of this File Server setup.
Brand Representative for Unitrends. Abdul - Thanks for using Unitrends! Where did you get THAT idea?
The QNAPs are very good. The only reason SAM dislikes them is because they don't offer an advance RMA option for replacement like some other brands do.
Best practices for getting the most out of an iSCSI SAN
In your case, you have a redundant backup ready. To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks. I have inherited a setup at a new work place, just been here under 2 months.
Are there any issues with using one of these over the other. But I am new here and this is what I have been given. Given the hardware I have at my disposal what would be best for this situation. Best Answer. These files are burned twice on dvd's and stored locally and offsite to be backed up for all cases.
If you ask me i would do this again. LAG is still lacking on bandwidth and single stream performance. It just depends on your needs, as for me this fits in my scenario. I did host vm's on this iscsi share for maintenance work on server local raid during out of office hours, but i wouldn't reccomend it on production use.
Define your workload and see if this fills your needs. Storage depends more on latency, after this iops and at last bandwith. Therefore local storage is always the performance option, even today where tb drives are affordable. Before this i tried a VHD X solution located on the nas and mounted it in windows. But there are some strange issues if the vm brakes down. The qnap thinks the file is till in use and i haven't found a quick way to avoid this except rebooting the nas.
As the nas is used as file server too, it broke the complete workflow while rebooting. After switching to iscsi i haven't run into any issues so far.Clients can partition, format, and use virtual disks exactly like local disks, and then use them for storage expansion or as backup destinations.
QNAP NAS Community Forum
In this tutorial the target is your NAS. Initiators connect to targets and use their storage. Warning: Connecting more than one initiator to the same target might result in data loss or damage to the NAS disks. Block-based LUNs use space from a storage pool.
File-based LUNs use space from a volume. Generally block-based LUNs should be instead of file-based LUNs, as they support more snapshot and virtualization features. For more a more detailed comparison, see the table at the end of this tutorial.
Mapped LUNs appear nested under their target. The new drive is ready to use and appears on the Mac OS desktop. Linux displays a login message. Example: Login session [iface: default, target: iqn. BB, portal: If you have any further questions about QNAP products or solutions, contact customer service through the Service Portal. The health status of a file-based LUN is always the same as its parent volume.
Thank you for your feedback. HelloWelcome! You can start using a variety of QNAP member services. Software Store Get licenses for advanced features from our Software Store.
Select a storage pool. Select a volume. This guarantees that the space will be available for connected iSCSI initiators.
This offers greater flexibility as empty space is not wasted.My question is for the networking portion. I normally use a 10GIG backbone switch between the two.
You need to backup the VMs so using something like Veeam to decouple the snapshots elsewhere is much better than LUN snapshots. QNAP is just hobby grade and not fit for production.
If it goes wrong you lose everything and there is simply no SLA on repair so you would absolutely have to buy two of them. The Dannon Project is an IT service provider. Install Hyper-V first! I strongly suggest you don't install windows server first then setup the role of Hyper-V. Just because you can do it doesn't mean you should. You can thank me later for not allowing you to waste resources on GUI! Your server host should use local storage not depend on the QNAP for it! Your host should use the QNAP as a backup target only.
If you need speed then pop in a 2 port 10 Gig card to your server host. But my question would be what are you "serving"? Side Note, I am using the current physical server as the new host once the P2V is done.
I'll be upgrading the memory and wiping the RAID fresh.Сетевое хранилище Qnap TS-451 Настройка ISCSI
Offsite with MS Azure will be implemented later. The iSCSI initiator only looks for the protocol and connects the target. Then you are worrying about throughput and link aggregation but using rpm spinning rust that have IOPS in the range.
Configuring iSCSI for QNAP on VMware 6.5
Also, as they grow I'd like to setup Failover Clustering with a secondary host. This is a small-med business. I understand your logic behind DAS on the host, but would like to have more of a redundant solution then just the standard RAID with daily backups. I've been told Hyper-V Snapshots are not the best route too. If you have a better suggestion, please by all means let me know.
I am working with what knowledge and understanding of the model I have. Even if it runs, it's not a good idea. Brand Representative for StarWind. Build you solution to match needs. What you are building could be fine if expectations are kept in line with limitations and real world logistics. To continue this discussion, please ask a new question.
Get answers from your peers along with millions of IT pros who visit Spiceworks. Hi Everyone, Running a new project by P2V'ing a server and segregating it's services. What is the best practice or recommendations everyone has for this setup? Thank you. Best Answer. Ghost Chili. Verify your account to enable IT peers to see that you are a professional.
If you want redundancy just use Starwind 2 node vSAN. You are getting an enterprise level shared nothing vSAN and its Free! Popular Topics in General Networking.Privacy Terms. Quick links. Post Reply.
I could write. We have a on it 12 x 5To hdd. We dedicated 2 disks for hot spare. We created on all left hdds a Raid6 Volume. The purpose of this NAS is to store disk dumps that are accessed from client machines. To manage these dumps we use a windows 2k12 which access the storage via iSCSI mutlipath. What is the best way to proceed? Thanks by advance for your help.
One big LUN!
QNAP NAS Community Forum
Yes by To I meant TB. What do you mean by I'll loose everything? How could this happen when you do raid6 with 2 hotspare disk? Other question, regarding the perf, what is the best in speed performance? Are you using span or stripe volume? Striped volumes can corrupt files if one the LUNs in the stripe were to go offline. Block is best for performance. I'm using span and not strip mode, which according to what i understood would be less dangerous than strip and a little bit less speedy than full block mode.
I'm waiting for a hdd pack which would allow me to transit from a mode to another. I'll first bench both solutions to check if it worth it. Regards Franck. Just don't allocate all the storage pool, keep some space free in case the LUN fills up.
Do not use thin provisioning,it requires the reclaim job.