Re: P7 740 E6C EXP24S mode 1, disk upgrade options -- MIDRANGE-L

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<snip>
> But since they worked out the bugs in VIOS-file-backed-storage,
> maybe it'll be worth it to use VIOS only for that feature?

I don't think this one really qualified as a bug so much as a performance limitation. As I understand the issue it had to do with the whole 520 to 512 byte sector translation. If I understand correctly the biggest issue was that these guaranteed extra I/Os to the disks effectively resulted in 2x the actual I/O. Everything worked (no bugs) but it was slow.

The correction was realizing that 520 is 520 (obvious I know.) If you've worked with the SAS array manager that's part of AIX (and by extension VIOS) you know that you must format drives to 520 byte sectors in order to start RAID on them. Since IBM i wants to see 520 byte sectors the correct solution was the obvious one, just use the 520 byte sectors you already have!

And so they did. This cuts the I/O s and thus performance returns.

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 1/1/2015 1:48 PM, Roberto José Etcheverry Romero wrote:

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