Re: [Xen-users] Shared Storage

[Jonathan Dye <jdye@xxxxxxxxxxxxxxxxxxxxx>]

+1 for infiniband, but if anyone knows how to rescan the luns without breaking 
connectivity to all the luns with SRP in linux let me know o_O

- jonathan

----- Original Message -----
From: "Bart Coninckx" <bart.coninckx@xxxxxxxxxx>
To: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>
Cc: "Jonathan Dye" <jdye@xxxxxxxxxxxxxxxxxxxxx>, "Xen List" 
<xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Sunday, April 24, 2011 12:36:46 PM
Subject: Re: [Xen-users] Shared Storage

That is completely dependent on your hardware specs and DomU's properties.
It sounds like a lot though. I seem to remember some time ago you also 
stated to want to run at least 100 DomUs on one hypervisor, maybe this 
is again pushing it.
With a decent RAID and 10gbit or infiniband you can go a long way 
though. You should also consider using SCST instrad of IET as it is faster.

B.



On 04/24/11 20:31, Jonathan Tripathy wrote:
> We're talking houndreds, if not thousands of DomUs here. Will iSCSI on
> Linux scale to these large numbers?
>
> Thanks
>
>
> On 24/04/2011 19:13, Jonathan Dye wrote:
>> Why not create one iscsi lun per vm disk instead of carving them up on
>> the hypervisor? That's more typical, and a more typical state of
>> affairs in linux is your friend. Also, you would have just one lun
>> queue if you exported one big PV, instead of one lun queue per vbd.
>> That becomes a problem at scale.
>>
>> - Jonathan
>>
>> ----- Original Message -----
>> From: "Jonathan Tripathy"<jonnyt@xxxxxxxxxxx>
>> To: "Xen List"<xen-users@xxxxxxxxxxxxxxxxxxx>
>> Sent: Sunday, April 24, 2011 11:25:38 AM
>> Subject: [Xen-users] Shared Storage
>>
>> Hi Everyone,
>>
>> I am consider such a setup where I export an iSCSI target to a Xen node.
>> This Xen node will then use the iSCSI block device as an LVM PV, and
>> create lots of LVs for DomU use.
>>
>> I was wondering if anyone could make me aware of any special
>> consideration I would need to take. I've posted a similar question to
>> the LVM list to ask for further tips more specific to LVM.
>>
>> Am I barking down the wrong path here? I know it would be very easy to
>> just an NFS server and use image files, but this will be for a large
>> scale DomU hosting so this isn't really an option. Additionally, if I
>> wanted to make the LVM VG visible to multiple Xen nodes, is it just a
>> matter of running CLVM on each Xen node? Please keep in mind that only
>> one Xen node will be using an LV at any one time (so no need for GFS, I
>> believe)
>>
>> Any help or tips would be appreciated
>>
>> Thanks
>>
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>
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