Landry Breuil wrote:
Hi, i encounter a very similar problem as reported in http://marc.info/?l=linux-kernel&m=118764381013943&w=2, but with a SATA disk. Trying to transfer 250Gb (mostly small files) from a SATA disk (ata1/sda) to another (ata2/sdb), both plugged on the VT6421 card, after some dozens of seconds the controler bails out and degrades write performance (UDMA133->UDMA100->UDMA33...) kernel: ata2.00: limiting speed to UDMA/33:PIO4 kernel: ata2.00: exception Emask 0x12 SAct 0x0 SErr 0x1400500 action 0x2 frozen kernel: ata2: SError: { UnrecovData Proto Handshk TrStaTrns } kernel: ata2.00: cmd 35/00:00:07:c6:f4/00:04:07:00:00/e0 tag 0 dma 524288 out kernel: res 40/00:b0:27:1d:dc/84:00:07:00:00/e0 Emask 0x16 (ATA bus error) kernel: ata2.00: status: { DRDY } kernel: ata2: port is slow to respond, please be patient (Status 0xd0) kernel: ata2: device not ready (errno=-16), forcing hardreset kernel: ata2: hard resetting link kernel: ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Reading big datas is okay so far. Creating a 2.5Gb file on the same disk with dd if=/dev/zero is okay too. dd'ing a 500Mb file 10 times in a loop from sda to sdb works too.
This seems to indicate that the controller lost communication with the drive. This is usually due to some kind of hardware problem, like a power issue, cable or drive problem. Given that it's occurring when both drives are active, a power issue is quite possible..
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