Jonathan B Bayer wrote:
> Hello Discuss,
>
> I'd appreciate any comments on the following situation:
>
> A large, dual quad-core Intel 5500 CPU system
>
> Storage: 6 2 terabypte drives, in a RAID 1+0 setup. Raid controlled
> by controller card. Total available storage is about 5.5 terabytes.
> The drives are 7200 RPM
>
> OS drive: 2 160 gig drives in a RAID 1 setup, software controlled
>
> OS: CentOS 5.4
>
> Virtualizatoni: KVM
>
> Virtual environments: Ubuntu 8.04 or 10.04
>
>
> Each virtual system will have a relatively small partition to boot
> from. The data partition (/var) will be accessed via either NFS or
> CIFS. The exported filesystems will be on the CentOS server, and
> exported to each individual virtual system. Each virtual system will
> access a different exported directory
>
> Each virtual system will be running PostGresql 8.2/8.3/8.4. In
> addition to the database, they also store 50-100 k images
>
> So, here are my questions:
>
> 1. Which is better for performance, NFS or CIFS?
>
> 2. What would be the best filesystem to store all the export
> directories on?
>
> 3. Would it matter if the file system data uses a different virtual
> interface than the primary interface?
>
> 4. How would you mirror the NFS volume to a second system?
>
> Thanks in advance
>
>
To me, it seems like far too little information to make any solid
recommendations. You don't say who the clients are, or what they are
doing, or how many of them with what sized files? Is it I/O bound or
some other characteristic? Is it bandwidth or latency? throughput or
IOPS? What are your uptime requirements and SLAs? So many questions..
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