Dale <rdalek1...@gmail.com> [10-12-14 17:48]: > Hi, > > I got one more hard drive to move over and it is SATA. Question one, > can the new mobo's do hot plugging for SATA drives? I have a plug on > the front of the case and was wondering since it is on the front if > they can be hot swapped or if I need to shutdown then hook it up. If I > can hot swap, where does the power come from? I know the drives I put > in the case have a separate power connection. How's that work exactly? > Is that just for external drives that have their own power? > > I have two dries in here already. One I bought and one that was > donated. This is what hdparm reports: > > fireball ~ # hdparm -tT /dev/sda > > /dev/sda: > Timing cached reads: 6788 MB in 2.00 seconds = 3395.32 MB/sec > Timing buffered disk reads: 328 MB in 3.01 seconds = 109.06 MB/sec > fireball ~ # hdparm -tT /dev/sdb > > /dev/sdb: > Timing cached reads: 6736 MB in 2.00 seconds = 3367.58 MB/sec > Timing buffered disk reads: 324 MB in 3.01 seconds = 107.69 MB/sec > fireball ~ # > > Is that about normal? The mobo is 3Gbs/sec and the drives are too. > Shouldn't they be faster than that? I read at one time that SATA is > basically plug up and it works. Just checking if there is a setting I > need to change. > > Related to the above, in the BIOS, it is set to Native IDE. Should > that be set to AHCI instead? Is that why it is slower than expected? > Is that good to go with Linux as well? I have this set in the kernel > and built in as usual: > > AHCI SATA support > > Let me know if I am somewhat right on anything. Oh, I decided to name > the new rig fireball instead of lightening. ;-) You may notice that > in the paste up above. > > Thanks. > > Dale > > :-) :-) >
Hi Dale, as I know, the hd hardware can't nearly as fast as the bus speed regardless whether it is 6GB/s or 3GB/s. Quickly doing the same as you on my harddisk gave: /dev/sda: Timing cached reads: 6726 MB in 2.00 seconds = 3364.06 MB/sec Timing buffered disk reads: 318 MB in 3.00 seconds = 105.93 MB/sec The speeds of 6 GB/s or 3GB/s are only reached, when reading data directly from the hd cache. I dont know, what motherboard you use. But the settings you describe seem to be identical to mine. Important is: In the BIOS go to the hd section and look, what the BIOS think the speed of your hd is (3 GB/s or 6GB/s). When found directly set you SATA chip to that speed. It is recommended to do so by the help of text of my BIOS. I have a 3GB/s disk. And yes, IDE is ok. Here you can find explanations about AHCI vs. IDE sata mode. http://www.techarp.com/showfreebog.aspx?lang=0&bogno=316 On my board (ASUS Crosshair IV Formula) it was said, that AHCI is slower than IDE, but (!) is not due to IDE vs. AHCI but to a limitation of the chip. Look at the benchmarks above: There no place to go faster than that. 3/6 GB/s on cach read are standard compliant and ~100 MB/s is the limitation of hardware normal people like you and me can pay for. Plug on the front: This seems to be E-Sata jack AND SHOULD BE CONNECTED INTERNALLY ONLY TO AN E-SATA (not SATA) JACK ON THE MOBO. In unmounted status: Yes it should be hotpluggable as USB. BUT dont connect the E-SATA jack of the case to a normal SATA jack on the board! E-SATA != SATA !!!! HTH mcc
