On Thu, May 23, 2019 at 7:44 AM <mad.scientist.at.la...@tutanota.com> wrote:
> I just put an SSD into my hp dl585g7. I used the provided sata SSD drive > connector, it's on the same sata driver that runs the optical drive. It's > terribly slow to boot etc. Is this just a slow controller designed to keep > up with an optical drive and swamped by an SSD? would pulling the optical > drive help? I may wind up hooking it to the internal SAS controller with > a suitable cable (there are 2 cables to the plugable hard drive area, i > could swap one for another cable as I'm only using 2 hard drives. I'd just > need to extend the power from the built in ssd connector. Advice? > Suggestions?? At this point it's slow to boot like a thumb drive on USB 2 > or an optical drive. I have an identical SSD in my desktop and it runs > near the rated 500MB/s so I'm confident the SSD is good. > Have you compared hdparm <device> and hdparm -tT <device> outputs between the hp and laptop? On my system with an SATA SSD, its only; # hdparm -tT /dev/sda /dev/sda: Timing cached reads: 7820 MB in 2.00 seconds = 3912.89 MB/sec Timing buffered disk reads: 172 MB in 3.13 seconds = 55.02 MB/sec So 3x slower than the spinning disks on the same box for the buffered disk reads.... # hdparm /dev/sda /dev/sda: multcount = 0 (off) IO_support = 1 (32-bit) readonly = 0 (off) readahead = 256 (on) geometry = 30401/255/63, sectors = 488397168, start = 0 multicount off is weird, lets see what it reports; hdparm -i /dev/sda | grep MaxMultSect BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off So it should be possible to set it to 16, # hdparm -m 16 /dev/sda /dev/sda: setting multcount to 16 Use of -m is VERY DANGEROUS. Only the old IDE drivers work correctly with -m with kernels up to at least 2.6.29. libata drives may fail and get hung if you set this flag. Please supply the --yes-i-know-what-i-am-doing flag if you really want this. Program aborted. Ok i'm not concerned about speed on this box, so i wont bother. Interestingly the spinning disks are multicount off on this box too, so that setting doesn't explain the SSD's slowness.
