On Thu, May 23, 2019 at 7:44 AM 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 and hdparm -tT 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.
