Another 2.4 upgrade horror story

[Sebastian Hagedorn]

Hi Eric,

--On 25. September 2012 14:28:03 +0200 Eric Luyten <Eric.Luyten at vub.ac.be> 
wrote:

> Thank you for sharing your experiences.
>
> As a site willing/needing to upgrade from 2.3.16 to 2.4.X this fall, we
> are interested in learning about your storage backend characteristics.
>
> What read/write IOPS rates were you registering before/during/after your
> upgrade process ?
>
> I'd understand your reluctance to share this information in a public
> forum. No offence taken whatsoever !

no problem, it just took me a while to gather the information. Our backends 
are IBM DS4300s. Some of the disks are 73 GB 15k RPM Fibre Channel Disks 
(RAID 5), others are 146 GB 10k RPM Fibre Channel Disks. The SAN 
controllers are IBM SVCs (model 2145 8F4). The load is balanced (though not 
evenly) over four disk controllers. According to our storage guy we see 600 
IOps/s on average, with peaks up to 2,000-3,000 under normal circumstances. 
During the migration we saw 10,000 IOps/s per controller, 40,000 in sum.

Hope this helps

Sebastian
-- 
     .:.Sebastian Hagedorn - RZKR-W (Gebäude 133), Zimmer 2.02.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
.:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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