Hi, I'm seeing poor sequential read performance (as measured using "hdparm -t") using the recommended Dell firmware version MA0D on Baracuda ES.2 1TB drives using libata with ICH Sata controllers in AHCI mode with NCQ enabled (Poweredge R210, R410 etc.). Similar performance bugs are seen during RAID verifies, rebuilds etc.
If I put the non-Dell firmware version AN05 on the drives, the performance bug goes away. Similarly if I reduce the NCQ depth to 2, sequential read performance is restored, but as this may impact performance under random I/O loads, I don't really want to do this... Seeing as Seagate seem to have fixed this issue for other non-Dell firmwares, any chance they could be persuaded to do-so for the Dell firmware series too? More here: https://ata.wiki.kernel.org/index.php/Known_issues#Affected_devices_2 Thanks, Tim. -- South East Open Source Solutions Limited Registered in England and Wales with company number 06134732. Registered Office: 2 Powell Gardens, Redhill, Surrey, RH1 1TQ VAT number: 900 6633 53 http://seoss.co.uk/ +44-(0)1273-808309 _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
