Yes, I must have hit reply to the wrong email or something.
I used both of those changes in the image I posted.
One person on IRC reported that image as being slower than the original.
I'd like to track that down before recommending that we upstream these
changes.
-Nahum
On 01/12/2016 06:28 PM, ZHU XIAN WEN wrote:
Hi Nahum Shalman
I use following disk table to boot usb:
* Id Act Bhead Bsect Bcyl Ehead Esect Ecyl Rsect Numsect
12 128 0 0 0 0 0 0 256 3891200
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
and following #528
The change is here:
https://github.com/joyent/smartos-live/blob/master/tools/build_iso#L187
from:
echo "y" | pfexec mkfs -F pcfs -o fat=32 ${bi_lofidev/lofi/rlofi}:c
to:
echo "y" | pfexec mkfs -F pcfs -o fat=32,spc=32 ${bi_lofidev/lofi/rlofi}:c
then, the performance is significantly faster/better.
Tony
On 1/13/16 06:06, Nahum Shalman wrote:
As a test I've made a USB image using the suggested fdisk table and
also using the change in #528 (referenced below).
It certainly boots when used as a virtual disk in a VM, but if anyone
would like to do some performance testing of it on a real USB stick
and report back, that would be great.
If people are happy with those changes I'll open up a pull request to
get this stuff upstream.
The image is here (built using a CI tarball so use on a test machine
not production):
http://us-east.manta.joyent.com/nahamu/public/smartos/platform-20160112T175701Z-4k-align-16k-cluster.usb.bz2
-Nahum
On 01/11/2016 10:49 AM, Nahum Shalman wrote:
On 01/09/2016 06:21 AM, ZHU XIAN WEN wrote:
hello Nahum Shalman,
this is Tony, I read the disk table of usb_fdisk_table starting from 63
sector, it is not alignment, may I know what's the tool you used to
generate the 2 GB disk table, actually, it is not aligned for 4k,
how to
align it? if I need a 8G usb, how to do it.
* Id Act Bhead Bsect Bcyl Ehead Esect Ecyl Rsect
Numsect
12 128 9 34 0 34 63 243 600
3905400
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
thank you very much
best wishes
Hi Tony,
If I recall correctly I think I just created a 2000MB file (slightly
smaller than 2GB to protect against people who might have gotten
"2GB" USB sticks that were slightly smaller than 2048MB) and then
used that as a raw disk for running SmartOS under QEMU.
I think I then just used the standard illumos tools to partition the
disk from within the VM, then dumped out that partition table after
mounting the image as a lofi device.
Unfortunately it's been so long since I did it that I've forgotten
precisely how I did it.
It might be worth revisiting that partition table to align it
properly for 4k block sizes along with testing the change proposed in
https://github.com/joyent/smartos-live/issues/528
I'm hoping others on the mailing list might have some ideas. Ideally
if someone has a physical 2GB device that advertises itself as using
4k blocks, pointing the tools at that device might help generate a
better partition table, etc.
-Nahum
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