Re: [Xen-users] XEN HVMs on LVM over iSCSI - test results, (crashes) and questions

[Errol Neal <eneal@xxxxxxxxxxxxxxxxx>]

Quoting Ivan Porro <pivan@xxxxxxxxxxxxx>:

> Hi all,
>
> some results from my configuration.
>
> I've this configuration (I'm not interested in raw top performances but
> in reliability.. so, I can accept slow MB/sec and prefer to rely on a
> RAID6, for example):
>
> 1 Infortrend iSCSI Array A16E-G2130-4 with:
> - 1GB DDR cache
> - RAID6
> - 7 x 500GB sataII Seagate ST3500630NS with 16mb (no budget for SAS)
> - one of the logic volumes (about 1TB) is actually bounded to a   
> single channel
> 1 DELL PE1950 server with:
> - QLogic iSCSI HBA QLA 4060C
> - 2 x Quad core x5335  2GHz Xeon
> - 8GB RAM
> - 2 x 73GB SAS drives (raid1 software)
>
> 1 DELL 2716 gigabit switch in the middle
Nice hardware you have there... I'm jealous :)


> The array, tha HBA and the switch are Jumbo frame enabled. CHAP
> authentication enabled.
For initial testing, I'd turn off CHAP and jumbo frames...

> I've successfully installed XEN 3.1.0 from source (kernel 2.6.18-xen)
> and the QLogic ISP4XXX iSCSI Host Bus Adapter driver 5.01.00.08-2.
What distribution are you using on the host platform?

> I have successfully installed a windows XP HVM, a Scientific Linux CERN
> - SLC - 4 and 3 (RedHat EL 4 and 3) HVMs and other non HVM machines.
> The volume I imported from the iSCSI is used with LVM: each HVM domain
> has a 8GB drive partitioned with a 1GB swap and rest on /.
>
> These are performance for bonnie++ (Per Chr column write and read):
>
> <SNIP>
Frankly, I think you have waaaayyy to many variables. Since this is  
the "Xen" forums, lets try to limit your configuration to the local  
system. Move/copy/recreate your LVM/ISCSI images onto the PE1950 and  
run them locally. Run the same test and see how it goes.
-Errol

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