October 18, 20223 yr I purchased a HGST SAS SSD 12Gbps I want to use for a faster read/writes as a UD share. After I connected it to my HBA I was disappointed in the speeds shown. ➜ ~ for ((i=0;i<12;i++)) do hdparm -tT /dev/sdd; done /dev/sdd: Timing cached reads: 44922 MB in 2.00 seconds = 22512.77 MB/sec SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 18 00 00 00 00 20 00 21 c0 00 00 00 00 f8 21 00 00 00 00 00 00 00 00 00 00 Timing buffered disk reads: 1208 MB in 3.00 seconds = 402.43 MB/sec When I do the same test with a WD Blue SATA SSD, I get this? ➜ ~ for ((i=0;i<12;i++)) do hdparm -tT /dev/sdb; done /dev/sdb: Timing cached reads: 44336 MB in 2.00 seconds = 22217.10 MB/sec Timing buffered disk reads: 1568 MB in 3.00 seconds = 522.38 MB/sec I enabled write cache but it didn't change anything. ➜ ~ sdparm -g WCE /dev/sdk /dev/sdk: HGST HSCAC2DA2SUN1.6T A29A WCE 0 [cha: y, def: 0, sav: 0] ➜ ~ sdparm --set=WCE /dev/sdk /dev/sdk: HGST HSCAC2DA2SUN1.6T A29A ➜ ~ sdparm -g WCE /dev/sdk /dev/sdk: HGST HSCAC2DA2SUN1.6T A29A WCE 1 [cha: y, def: 0, sav: 0] I'm not sure how to fix "SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 18 00 00 00 00 20 00 21 c0 00 00 00 00 f8 21 00 00 00 00 00 00 00 00 00 00" tower-diagnostics-20221017-2052.zip
October 22, 20223 yr Author Solution I swapped out the HBA for an LSI SAS9300-16i with new SFF cables. Problem solved. HBA (Dell H310) was the problem or the cables. Cut my parity check time in half too. ➜ ~ for ((i=0;i<12;i++)) do hdparm -tT /dev/sdd; done /dev/sdd: Timing cached reads: 44684 MB in 2.00 seconds = 22393.42 MB/sec SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 18 00 00 00 00 20 00 21 c0 00 00 00 00 f8 21 00 00 00 00 00 00 00 00 00 00 Timing buffered disk reads: 3032 MB in 3.00 seconds = 1010.05 MB/sec
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