High latency spikes on new SSD SAN but only in ESX
So we just put in a new Compellent SC4020 SAN and i'm noticing that occasionally ESXi (5.5) is reporting crazy latency like anywhere from 300 to 1000+ms under performance/datastore but on the SAN side...
View ArticleVMFS datastore comaprison and use case NFS vs. iSCSI ?
Hi All, Using the NAS device TVS-471 :: QNAP can anyone here please share some thoughts and comments about which VMFS data store technology NFS or iSCSI would be performing better for hosting...
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Re: VMFS datastore comaprison and use case NFS vs. iSCSI ?
Here is a good comparison guide: Storage Protocol Comparison - A vSphere Perspective - VMware vSphere Blog
View ArticleVm drive bad performance
Hello Experts, Actually one of my vm disk drive is giving me very bad performance ( even while copy some data from one drive to this drive) . The server is used for SAP and the drive is the db drive...
View ArticleUnable to add datastore!
I am building a lab for my VMware study. I have a server with two partitions. I installed VMware Player 12 and vSphere Client. I installed VMware ESXi 6 with 40GB datastore as default. Now I need to...
View ArticleRe: Unable to add datastore!
Using the VMware Workstation, edit your ESXi 6 virtual machine and add a new hard disk with the capacity that you want. After add the new disk, you can create a new datastore using that disk, just go...
View ArticleRe: Connecting ESXi to two different iSCSI SANS
Hi, Are you using jumbo frames by chance? if you are, can you ensure its enabled throughout (vSwitch, iscsi VMkernels, physical switch, SAN, etc). If you are not using Jumbo frames, please ensure...
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VERY slow SAN performance on ESXi hosts and VMs
Greetings, everyone. I encountered strange activity in my company's storage area network (BTW, I'm totally noob in this field). In short: ESXi hosts and VMs disk throughput rate is from 24 MiBps to 130...
View ArticleMultiple Drives: 1 Large Array vs 2 Smaller Arrays
Hey,General question as I am in the process of rolling out a storage solution that will support a lightweight ESXi environment.If I have 8 physical drives (all identical capacity and speed), would I...
View ArticleRe: Multiple Drives: 1 Large Array vs 2 Smaller Arrays
Are you talking about a single ESXi host with local disks ?Then the answer is easy:NEVER even consider using a standalone ESXi with just one VMFS-volume.It may look like a good idea to add all disks...
View ArticleRe: Unable to add datastore!
If your Workstation host is able to act as NFS-server it is quite convenient to use an NFS-share.Running VMs from that share is much more space-efficient than running the nested VMs from vmdks that are...
View ArticleRe: Connecting ESXi to two different iSCSI SANS
ESXi often has problems with creating a partition table on brand new created iSCSI-volumes.It often helps to use a Linux to create a partitiontable first.When ESXi sees a partitioned volume it probably...
View ArticleCisco UCS - Allowing a VM to access the direct attached FC SAN Lun's used by...
Evening, In Veeam, you can backup directly from a VMFS volume so long as you allow the Veeam Backup Server direct access to either iSCSI or FC LUN, it doesn't need to be mounted by the windows server,...
View ArticleLUN not accessible vsphere
We have a Synolgy SAN. It was connected to an ESXi host. After a power outage things got back into operation but the LUN did not get connected to the ESXi. We did try several things: 1. Rescan the...
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Re: LUN not accessible vsphere
Please clarify stpe 3. Do you only see the LUN under "Storage Adapters", or do you see the datastore under "Storage", but it doesn't show data anymore?In case you can see the LUN, but the datastore...
View ArticleUsing Hardware VSS Provider from inside VM
Hi. Does anybody has experiences if it is possible to use a hardware vss providerfor a san storage from inside a VM for a physical RDM? What we want to do is to create a san based snapshot of a RDM...
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CID mismatch error
Buenos días,Tengo un problema con uno de mis discos virtuales SERVER-AD_1-000001.vmdk de 1.4TB de tamaño, dejo de reconocer el Vmware Esxi 6.0, los sistemas lo tenia en otros discos virtuales, al...
View ArticleRe: LUN not accessible vsphere
HI a.p, By Step-3, I mean I had restarted the ESXi host and tried to reconnect the LUN (with its iqn number given in the SAN). The LUN gets connected to the esxi host but this LUN did have my VM's and...
View ArticleRe: CID mismatch error
That command will very likely produce an empty file as you should not have SERVER-AD_1-00001.vmdk at all.Count the zeros in the filename !
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Re: LUN not accessible vsphere
It happens occasionally that a LUN looks empty after a power failure.Be careful with your next steps.Probably your VMs are still there and can be extracted if you dont make mistakes.Please create a...
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