4k alignment for attaching new disk to zfs mirror

[Karolis Eigelis]

Hi,

Before creating a pool i setup two disks mirror with gnop trick to have
ashift=12 - 4k pool alignment. I also did that for the disk partitions (gpt
-a 4k option) to have partitions 4k alignment (diskinfo -v disk shows
stripesize=4096 for both disks).

Now i replaced one disk with a new one, but cant get the diskinfo or gpart
list to display stripesize=4096 - did everything as usual (gpt -a 4k for
partitions). Or do i have to re-create my pool with gnop trick again ?

Do you have an idea if that at all is needed ? Some other information i
found says that as long as pool is 4k alignment is done (ashif=12) you do
not need to do 4k alignment for new disk for partitions with gpart -a 4k
option. Could someone please comment on that ?

Many Thanks,
Karolis
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Re: ZFS and zpool mistake

[Karolis Eigelis]

if you want a mirror you need to do "attach" a new disk :)

On Mon, Oct 8, 2012 at 5:29 PM, Matthias Fechner  wrote:

> Dear list,
>
> I installed a freebsd with freebsd on a zfs root and only one disk:
>   pool: zroot
>  state: ONLINE
>   scan: none requested
> config:
>
> NAME STATE READ WRITE CKSUM
> zrootONLINE   0 0 0
>   ada0p3 ONLINE   0 0 0
>
> This disk was now insterted into the computer and boots fine.
> The next step I wanted was to setup a mirror with a second disk.
>
> So I inserted a second disk, configured everything with gpart and added
> the disk to the zroot with:
> zpool add zroot gpt/disk1
> (I think I had to execute zpool add zroot mirror gpt/disk1, this is not
> clear from the man page)
>
> And now I have a problem, it seems not to be a mirror but a stripe:
> NAME STATE READ WRITE CKSUM
> zrootONLINE   0 0 0
>   ada0p3 ONLINE   0 0 0
>   gpt/disk1  ONLINE   0 0 0
>
> Is there any chance to get it into a mirror?
>
> I don't think there was anything written to the second disk but I cannot
> remove it anymore.
>
> Has anyone a tip for me, howto convert the stripe to a mirror?
>
> Thanks,
> Matthias
>
> --
> "Programming today is a race between software engineers striving to
> build bigger and better idiot-proof programs, and the universe trying to
> produce bigger and better idiots. So far, the universe is winning." --
> Rich Cook
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logging debug of hw.usb.debug=1 with syslog

[Karolis Eigelis]

Hi,

i need to debug USB device and i want to log all the messages via syslog,
but i do not know how to do that i looked at syslog.conf, but could find
the flag i should use for debug.log.

i used sysctl hw.usb.debug=1 lots of things i get printed out, but how to
log them permanently ?

Many Thanks,
Karolis
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