Solved

ZFS: some pracitical questions

Posted on 2013-01-06
3
321 Views
Last Modified: 2013-01-06
Hi,

I have some practical question on ZFS.

1.Hanccocka mentioned he has NFS + ISCSI running, why is that. Why ISCSI AND NFS?

2.What/how to do to configure ISCSI on the Nexenta (for the ESXi side: no problem)

3.If you add a CIFS-share: won't it impact the performance of the vm's? Or is this neglectable?

4.Does performance of ZFS get better after a while (when cache/logs are built) ...?

5.How many vm's do you have running on a ZFS NAS? I would like to run all my vm's but wonder if it could take it (will cache be more heavily used so it CAN take it or is it just the logic = less = the better performance)?
vm's I would like to run: windows 7 workstation, sql 2008, windows sccm, windows scom, vcenter 5, 2 domain controllers, 2 xenapp-servers, maybe also a windows 2012 and windows 8 as testdrive
=> therefore question 4, I had the impression performance got better after a while, just want to know if I'm over-exhausting zfs running all these vm's  (then I would run some on local ssd's in the esx-server) or I would not take advantage of what it's capable of

6.One more thing: what to do with 3 nic's in ZFS, use them all, only use two of them & how to configure then?

Please advise.
J.
0
Comment
Question by:janhoedt
  • 2
3 Comments
 
LVL 119

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 38749265
1. NFS is easier and quicker to setup, there is no requirement for creating and assigning LUNs. Some workloads are better using iSCSI (it's faster).

NFS is native amongst Linux and Unix, easier to transfer files, than standard Windows Samba/CIFs.

if you can do JF see my EE Article

HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client

also best way to setup iSCSI on ESXi

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0

2. See this Tutorial

3. Neglible, and you are not reading and writing to CIFs, much. Certainly not as busy as NFS or iSCSI.


4. Performance diminishes if you use up all the disk space. But your performance should be roughgly the same from the moment you have built it with logs and cache.

5. Different labs have different amounts of VMs, 40-50 NFS, Domain Controllers, SQL, vCenter, Operations Manger, VDI, Win2k8 Servers, Linux Servers Solaris Servers.

6. Team and trunk your NICS for resilience at least (with the low processor, it's difficult to fully saturate a single 1GB NIC).
0
 

Author Comment

by:janhoedt
ID: 38749293
1.ISCSI for "some" workloads, you wouldn't recommand it by default (for performance reasons, just as you would use vmxnet3, not e1000 as nic in vmware machines)?

2.great tutorial thanks!

3.ok, I might consider bringing all my data of my Synology over to ZFS

4. & 5. ?! wow, so performance is only impacted by lack of diskpace, not the amount of vm's?
40 or 50 vm's on 1 ZFS?

6.ok, might not be good option to add extra nic, however if I would add my data to it and backup over network + migrate vm's once and a while to other nas (synology), it might be still good option to add more nics, right?
0
 
LVL 119
ID: 38749299
1. again wether you use iSCSI or NFS, it's up to you, Test, see which is better for you. It's not a ZFS SAN question, it's the age old question of NFS versus iSCSI.

2. no problems.

3. we use CIFs.

4 & 5. Yes, performs well for us on NFS.

6. Two NICs is always better than one. But in our tests, we've not been able to saturate a single 1GBe NIC, because of the performance on the server (cpu)
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article will show you how to create an ISO CD-ROM/DVD-ROM image (*.iso), and MD5 checksum signature, for use with VMware vSphere Hypervisor 6.5 (ESXi 6.5). It's a good idea to compare checksums, because many installations fail because of a corr…
In this article, I show you step by step with screenshots to assist you - HOW TO: Deploy and Install the VMware vCenter Server Appliance 6.5 (VCSA 6.5), with some helpful tips along the way.
Teach the user how to use configure the vCenter Server storage filters Open vSphere Web Client:  Navigate to vCenter Server Advanced Settings: Add the four vCenter Server storage filters: Review the advanced settings: Modify the values of the four v…
Teach the user how to configure vSphere clusters to support the VMware FT feature Open vSphere Web Client: Verify vSphere HA is enabled: Verify netowrking for vMotion and FT Logging is in place or create it: Turn On FT for a virtual machine: Verify …

820 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question