Public bug reported: Binary package hint: linux-image-2.6.17-10-generic
I apologize for my very poor English. Any device is /dev/sdb goes slowly and when it works the system is unstable. hdparm -tT /dev/sda /dev/sdb returns /dev/sda: Timing cached reads: 1516 MB in 2.00 seconds = 756.88 MB/sec Timing buffered disk reads: 198 MB in 3.01 seconds = 65.70 MB/sec /dev/sdb: Timing cached reads: 1760 MB in 2.00 seconds = 878.71 MB/sec Timing buffered disk reads: 6 MB in 3.59 seconds = 1.67 MB/sec ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Also whit new kernel 2.6.19 i have the some problem. Instead with kernel 2.6.15 (Dapper's kernel on Edge) it works properly: hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 178 MB in 3.00 seconds = 59.25 MB/sec It's a Ubuntu bug and not a kernel bug because with other distribution linux whit kernel > 2.6.17 (as an example knoppix 5.10) it works. Controller SATA is: 01:07.0 Mass storage controller: ALi Corporation ALi M5281 Serial ATA / RAID Host Controller (rev a1) 01:07.1 Mass storage controller: ALi Corporation M5228 ALi ATA/RAID Controller (rev c6) ** Affects: linux-source-2.6.17 (Ubuntu) Importance: Undecided Status: Unconfirmed -- sata_uli - second sata hard disk does not work properly. https://launchpad.net/bugs/73236 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs