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тАО05-24-2009 07:38 PM - last edited on тАО05-25-2015 08:59 PM by Maiko-I
тАО05-24-2009 07:38 PM - last edited on тАО05-25-2015 08:59 PM by Maiko-I
P4000 SAN to support 2 physical servers and 6 VM's?
I am looking to replace 5 real servers (usual suspects, Exchange, File/Print, SQL, OWA, ISA) with 2 virtual servers running 5-6 VM's using Windows Server 2008 Hyper-V. This is to support a fairly stable workload for 60-70 people.
We have a storage issue now with the DAS (about 600GB) and think a SAN is a better way forward.
Looking at the HP offerings it seems that the LeftHand P4000 SAN solution would suit us. We would need to be able to store our VM images on the SAN, boot from it (or is it boot from USB device now and then load the image from the SAN) and store all mail, SQL database etc. on the device. I think the 4.8TB configuration would do us for a while.
I guess I had two questions.
1. Can this device support Hyper-V and booting from it?
2. I read somewhere that Hyper-V cannot allow VM's to share LUNs but I am not sure in our environment that is an issue. Should I be concerned about that? I don't see a regular need to create/destroy VM's in this environment.
Thanks
Larry
P.S. This thread ahs been moved from Storage Area Networks (SAN) (Enterprise) to HP StoreVirtual Storage / LeftHand - Hp Forum Moderator
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тАО05-26-2009 01:22 AM
тАО05-26-2009 01:22 AM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
1.1 Well... I supports boot-from-san, it supports Hyper-v, so why shouldn't it support boot hyper-v from san? :) Or, i think i misunderstood your question...
2 Afaik, the main idea of a lun sharing is a clustering. So, if you won't use clusters into Hyper-V (it supports failover cluster without lun sharing, afaik) - you don't need it.
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тАО05-26-2009 02:00 AM
тАО05-26-2009 02:00 AM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
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тАО05-26-2009 02:37 AM
тАО05-26-2009 02:37 AM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
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тАО05-26-2009 05:25 PM
тАО05-26-2009 05:25 PM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
Does that make sense?
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тАО05-28-2009 05:44 AM
тАО05-28-2009 05:44 AM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
Well, anyway, if it will be slow (i mean disk i/o)- just add a couple of disks to the server - just for host os, and that's all.
And one more thing: in all cases, don't forget about good NIC (with normal TOE and hardware iSCSI accelerator).
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тАО05-28-2009 07:15 AM
тАО05-28-2009 07:15 AM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
You have a server that runs your Virtualization platform... Windows HV, VMware ESX, XEN, etc... This is the "Operating System" for the physical server. Usually this is installed on local hard drives and does not require a lot of space. A Pair of 72GB HDD's is usually sufficient.
Now, you have external storage. The storage gets presented to the server somehow... Fibre.. iscsi... whatever it may be. This becomes yor "datastore" (there might be different terms for different platforms.. I am using the VMware terms).
Your datastore is where all of your Virtual Machines reside. In this case, on a P4000. So in fact... ALL of your VM's are "Booting from SAN" while your Physical server is booting from local disk.
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
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NPP3 (Nutanix Platform Professional)
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тАО05-28-2009 12:58 PM
тАО05-28-2009 12:58 PM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
But one question was asked that I wasn't so sure about. What about physical swap space? I am guessing the host OS and virtual hosts need swap space and even if they are given enough real memory, swapping is inevitable. Not sure what swap performance would be like over iSCSI as the P4000 or should the swap files also be locally atttached storage on each of the real host machines? And then can the VM's also be told to use that space rather than virtual store which might be on the P4000 and therefore across the network?
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тАО05-29-2009 01:04 AM
тАО05-29-2009 01:04 AM
Re: P4000 SAN to support 2 physical servers and 6 VM's?
And yes, i've heard some recommendations from Ms about putting swap on the DAS in case of booting from SAN (it was quite a long time ago and i can forget some moments..).
So, you can get some "insurance" from this issue by buying a raid-controller for the server with BBWC and in case of a problem with the swap load - you can just move it on the DAS.