[OpenIndiana-discuss] Linux software-raid with two Comstar iSCSI volumes

[Roel_D]

Performance will be higher or lower then 125MB/s. It depends on the filesizes and file-type since ISCSI does some buffer and compression. 

I had 125MB/s for some files over a 2Mb/s SDSL line. But that declined to 30Kb/s when the buffers ran full. 

Kind regards, 

The out-side

Op 15 nov. 2012 om 21:53 heeft Timothy Coalson <tsc5yc at mst.edu> het volgende geschreven:

> On Thu, Nov 15, 2012 at 5:38 AM, Florian <florian at acw.at> wrote:
> 
>> Hello,
>> 
>> has someone experience with Linux software-raid with two Comstar iSCSI
>> volumes from two OI servers?
>> 
>> I tested this on a virtual machine, but it would be great, if I can get
>> some  experience with such a combination!
>> 
>> Will this work without problems? The Linux Server is connected through one
>> Gbit Interface to a switch and this switch is connected to the two OI
>> servers. Will there be a bottleneck? Can I get full Gbit speed or is this
>> speed divided due to the mirroring of the iSCSI volumes?
> 
> Just from how linux software raid1 works, I would expect your maximum write
> throughput to the md device to be half the network throughput, since it has
> to write every block to both servers through one link.  Reading is likely
> to only read any given block from one device, so full network throughput is
> likely there (assuming no congestion, etc).
> 
> Gigabit network with theoretical peak at 125MB/s will probably be your
> bottleneck unless the pools containing the zvols have rather poor
> performance.
> 
> Tim
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