Re: Needing advice about ZFS and SAN LUNs


"Richard B. Gilbert" <rgilbert88@xxxxxxxxxxx> schrieb im Newsbeitrag
news:4bidnYHobrLrb5zXnZ2dnUVZ_hKdnZ2d@xxxxxxxxxxxxxxx
Heinz Müller wrote:
Hi,

I've got three 50GB SAN LUNs from an EMC box.
Within the EMC Box the three LUNs were generated from a RAID-5.

For my database ( SYBASE ) I need about 40GB.

My first thought was to take a complete LUN in a zpool
and generate different ZFS volumes for my database.

However, my colleague advises me, to create a slice of about
13GB on each LUN and put them together to a zpool to
get about 40GB for my database. He's understanding is that
the I/O throughput should be better.

I'm not familiar with ZFS so I would like to know which
of the two ways is the better one, because at the end of the day
all I/O is generated in the RAID-5 of the EMC Box.

Thanks!

Heinz




You didn't say what database you are using so I will assume Oracle.

"For my database ( SYBASE ) I need about 40GB."

It's SYBASE.

"Software RAID on top of hardware RAID may have some performance problems"

I need a Volume Manager (ZFS ) because it's an cluster environment.

Heinz


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