Hey, on a production system I run kernel 2.6.35 and XFS (rw,relatime,nobarrier) on a lvdevice of a vgroup consisting of five dm-crypt devices (cryptsetup -c aes-lrw-benbi -s 384 create) , each of which runs on a md-raid1 device (mdadm --create --level=raid1 --raid-devices=2) on two 750 GB ATA devices. The read performance is abysmal. The ata devices can be ruled out, as hdparm resulted in acceptable performance: > Timing cached reads: 9444 MB in 2.00 seconds = 4733.59 MB/sec > Timing buffered disk reads: 298 MB in 3.02 seconds = 98.73 MB/sec How can I best track down the cause of the performance problem, a) without rebooting too often, and b) without breaking up the setup specified above (production system)? Any ideas? perf(1)? iostat(1)? Thanks & best, Dominik -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
