Date: Sat, 26 Sep 2015 20:10:41 -0453.75 From: "William A. Mahaffey III" <wam@hiwaay.net> To: freebsd-questions@freebsd.org Subject: Re: dd question Message-ID: <560740C7.3060102@hiwaay.net> In-Reply-To: <56073D71.5060404@sneakertech.com> References: <5606A4FF.4090105@hiwaay.net> <CA%2BtpaK3UOEfKSfSjbdcH%2BR2jaU9=XVBEg%2B%2Bjn5VCbiiUkLF_Tg@mail.gmail.com> <56073D71.5060404@sneakertech.com>
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On 09/26/15 19:57, Quartz wrote:
>> Well first off I'd tell dd to use a bigger bs like 1m.
>
> I'll second this. I think the default for mos *nixs is 512 byte
> blocks, which is painfully slow. You need to manually specify bs=1M.
>
> It's also possibly the stick is just dying, but try the blocksize first.
I tried the 'bs=1m' & it sped things up by about 40X (from 90-ish KB/s
to 3.4-ish MB/s) :-) .... All is well.
As an aside, is there a way to configure the stick's FS to use/report
all available space, rather than what the img was sized to, *after*
dd-ing the img ?
[root@kabini1, /etc, 8:09:41pm] 342 % df
Filesystem Type 1024-blocks Used Avail
Capacity Mounted on
/dev/ada0p3 ufs 20307196 12140912 6541712 65% /
devfs devfs 1 1 0 100%
/dev
/dev/stripe/usr_str ufs 60921596 10477380 45570492 19% /usr
/dev/stripe/home_str ufs 3684793728 220043372 3169966860 6% /home
procfs procfs 4 4 0 100%
/proc
tmpfs tmpfs 8388608 32 8388576 0% /tmp
linprocfs linprocfs 4 4 0 100%
/compat/linux/proc
fdescfs fdescfs 1 1 0 100%
/dev/fd
/dev/da0a ufs 698671 651741 -8963 101%
/media/sd
[root@kabini1, /etc, 8:09:52pm] 343 %
i.e. /media/sd shows about 698 MiB instead of full 4-ish MB it is really
sized to .... TIA for any clues :-).
--
William A. Mahaffey III
----------------------------------------------------------------------
"The M1 Garand is without doubt the finest implement of war
ever devised by man."
-- Gen. George S. Patton Jr.
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