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RE: [Xen-users] new on xen.

Hi Mauro,


My experience with VMs and raid configs is the best array type varies depending on the VMs use, just as it does with normal physical servers.


Web and Db the two uses you mention are typically more reliant on random read and write performance rather than sequential read or write performance. In your setup if two VMs start to come under typical heavy disk load for Web and DB servers then it is likely two raid 1 arrays (1 for each VM) will perform better than a single Raid 10 or Raid 5.  


I’d be interested to hear what others think.




From: Mauro [mailto:mrsanna1@xxxxxxxxx]
Sent: 13 November 2008 08:47
To: Robert Dunkley
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] new on xen.



2008/11/13 Robert Dunkley <Robert@xxxxxxxxx>

Hi Mauro,


You would need to partition  the arrays in LVM if you needed more VMs. In the end it comes down to convenience versus performance, individual Raid 1s perform best when multiple VMs come under load but one large Raid array is easier to manage.

ok, thanks anche scuse me if I reply directly to you, I forget to do a reply-all.
Last thing...do you suggest only raid1 stripes instead of raid1+0?
Because my controller give me raid5 and raid1+0 choices.
I have a Smart Array P400 SAS/SATA Controller in a HP Proliant DL 580 G5.


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