Hi Clean all counters on the FC switches and see which port have errors .
For brocade run : slotstatsclear statsclear porterrshow For cisco run: clear countersall There might be bad gbic/cable/Storage gbic, which can affect the performance, if there is something like that - u can see which ports have errors grow over time. Regards Yaron Daniel 94 Em Ha'Moshavot Rd Storage Architect ? IL Lab Services (Storage) Petach Tiqva, 49527 IBM Global Markets, Systems HW Sales Israel Phone: +972-3-916-5672 Fax: +972-3-916-5672 Mobile: +972-52-8395593 e-mail: [email protected] IBM Israel From: Jonathan Buzzard <[email protected]> To: [email protected] Date: 07/07/2018 11:43 AM Subject: Re: [gpfsug-discuss] High I/O wait times Sent by: [email protected] On 07/07/18 01:28, Buterbaugh, Kevin L wrote: [SNIP] > > So, to try to rule out everything but the storage array we replaced the > FC cables going from the SAN switches to the array, plugging the new > cables into different ports on the SAN switches. Then we repeated the > dd tests from a different NSD server, which both eliminated the NSD > server and its? FC cables as a potential cause ? and saw results > virtually identical to the previous test. Therefore, we feel pretty > confident that it is the storage array and have let the vendor know all > of this. I was not thinking of doing anything quite as drastic as replacing stuff, more look into the logs on the switches in the FC network and examine them for packet errors. The above testing didn't eliminate bad optics in the storage array itself for example, though it does appear to be the storage arrays themselves. Sounds like they could do with a power cycle... JAB. -- Jonathan A. Buzzard Tel: +44141-5483420 HPC System Administrator, ARCHIE-WeSt. University of Strathclyde, John Anderson Building, Glasgow. G4 0NG _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org https://urldefense.proofpoint.com/v2/url?u=http-3A__gpfsug.org_mailman_listinfo_gpfsug-2Ddiscuss&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=Bn1XE9uK2a9CZQ8qKnJE3Q&m=TM-kJsvzTX9cq_xmR5ITHclBCfO4FDvZ3ZxyugfJCfQ&s=Ass164qVEhb9fC4_VCmzfZeYd_BLOv9cZsfkrzqi8pM&e=
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