As my previous experienced, if you having a disk space full on /var, the host server will getting an error message such as “A general error occured : Failed to create journal File provider” when creating a new virtual machine. I had my test machine setup as default configuration, which the /var/log only allocated for 2GB in place. Prior to move the system to production, I decide to extend the /var/log from 2GB to 10GB as our current standard. Here come to the idea that I try to extend, unmount and remount as I usually did on the Linux.
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I just read an interesting article and wat the demo video for the products of Stor Magic SvSAN which is capable to provide the flexibility for us to utilize the local Hard drive in our machine to act as a share storage. As we know, the 1TB SAS HDD is available in the market today, and most of the ESX servers we have today, are not running with local storages due to the requirement of HA, DRS and VMotion within ESX servers. In the video, it show the flexibility and opportunities to fully utilize the ESX servers we have. I am interesting into this particular products and idea and downloading for a try now.
More review will be publish after my test on this. If the success of this products is true, we should able to save some money for some of the cases which may not require big SAN box to their environment to entitle the HA, DRS and Vmotion features. Stay tune.
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Gabesvirtualworld posted Prevent your LUNs running out of space remind me about my VMFS LUNs space. Personally I don’t agreed about create a dummy vmdk on each LUN. Why? Arnim, you still have to wake up at 3am if received any calls. Just a joke!
Have a look here:
VMware ESX VMFS LUNs Report.
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To improve the I/O performance for ESX Virtual Infrastructure, VMware had come out with the round robin option for both ESX and VM guests. Although is an experimental option in the ESX setting today, but I will encourage you all to try this option which provide fail over and load balancing on the storage path to connect to you SAN storage. For VM guests, you will allow allow to use this when you have RDM – Raw Device Mapping option to direct read write to the physical LUN from your SAN storage without using VMFS.
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Recently I had read a couple of article regarding the performance caparison chart from VMware, Netapps and some of the forum communities, I do really find out the real performance is much different with the technical white paper that I read before this.
As for the today, more users are actually deployed the mission critical and high I/O servers on the virtualization environment, but we do see some I/O bottle neck which cause by the storage performance always. VMDK do provide flexibility from management perspective, but it does sacrifice the performance you may require for your databases, files transfers and disk performance. I had run a couple of test with real case scenerio instead of I/O meter that been always use widely, and here is the summarize result I would like to share.
In disk perfomance, we always split it to 2 categories as sequential and random I/O. in sequential mode, you will see the huge different while you try to perform the file transfer locally or through network. My test environment is running with SAN storage from fiber channel with same LUN size and raid group which are created from the Storage Level. The only differences is VMFS Vs Raw.
Raid Group design 7+1 raid 5 configuration and run on MetaLun configuration
Each LUN size is 300GB
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