Hi

I used to had tons of ahci errors in my 4 disk raidz1 worth of
HD154UIs when the rig was built a year ago or so (with 8.0 Release),
but they dissapeared after tuning ZFS.

Sadly i also got a new timeout days ago followed with smartcl erros i
still keep unchecked but i guess they cold be legit, i still have to
test/swap cables and give it a try.

@Alexander: Where did you got the info about those drives being 4K?
-----
Feb  9 08:24:55 zaibach kernel: ahcich3: Timeout on slot 2 port 0
Feb  9 08:24:55 zaibach kernel: ahcich3: is 00000000 cs 00000ff8 ss
00000ffc rs 00000ffc tfd c0 serr 00000000 cmd 0004c317
-----
Feb 14 19:26:48 zaibach smartd[63590]: Device: /dev/ada3, 5 Currently
unreadable (pending) sectors
Feb 14 19:26:48 zaibach smartd[63590]: Device: /dev/ada3, 1 Offline
uncorrectable sectors
-----

Regarding the drives themselves i really expected more throughput,
funnily i tend to get faster writes than sequential reads with samba
(40Mb/s vs 30ish Mb/s under a Gb link) and i'm really waiting for the
prices to settle to try another ones.

On Tue, Feb 14, 2012 at 7:23 PM, Martin Sugioarto <martin@sugi...> wrote:
> Am Tue, 14 Feb 2012 18:17:19 +0100
> schrieb Harald Schmalzbauer <h.schmalzbauer@omni...>:
>
>> > I find it interesting that, at least so far, the only people
>> > reporting problems of this type with the ahci.ko driver are people
>> > using Samsung disks.  The only difference is that your models are
>> > F1s while the OPs are F2s.
>>
>> I saw such timeouts long ago and mav@ had a look at my postings and he
>> mentioned it could be a NCQ problem.
>> I suspected the disks firmware.
>> I never tracked it down further, because after replacing the Samsung
>> (F3 in that case) disks with hitachi ones solved all my problems and
>> gave a big performance kick as well (with zfs).
>> You can find the discussion here:
>> http://lists.freebsd.org/pipermail/freebsd-stable/2010-February/055374.html
>
> Hi,
>
> I just want to add here that I am using 2 drives of type "Samsung
> HD103SJ" (SpinPoint F3). And I did not have problems with ZFS and with
> UFS either (for several years now). Everything has been deployed ontop
> ada(4) since FreeBSD-8.
>
> Actually the speed is very good (sequential read at 140 MB/s and more).
>
> --
> Martin
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