[Gluster-users] XFS and MD RAID

[Jack Wang]

2012/9/10 Stephan von Krawczynski <skraw at ithnet.com>:
> On Mon, 10 Sep 2012 09:39:18 +0100
> Brian Candler <B.Candler at pobox.com> wrote:
>
>> On Mon, Sep 10, 2012 at 09:29:25AM +0800, Jack Wang wrote:
>> > below patch should fix your bug.
>>
>> Thank you Jack - that was a very quick response! I'm building a new kernel
>> with this patch now and will report back.
>>
>> However, I think the existence of this bug suggests that Linux with software
>> RAID is unsuitable for production use.  There has obviously been no testing
>> of basic critical functionality like hot-plugging drives, and serious
>> regressions are introduced into supposedly "stable" kernels.
>
> Brian, please re-think this. What you call a stable kernel (Ubuntu 3.2.0-30)
> is indeed very old.
> If you want to check a MD raid you should really use a stock kernel from
> kernel.org (probably 3.4.10).
> _That_ is the latest stable kernel.
>
3.2 sery is stable tree too. for the bug above 3.4.10 should be
affected too as I know.


>> So I'm now on the lookout for a 24-port SATA RAID controller with good Linux
>> support. What are my options?
>>
>> Googling I have found:
>>
>> * 3ware 9650SE-24
>> * Areca ARC-1280ML
>> * LSI MegaRAID 9280-24i (newer SAS/SATA)
>> * Areca ARC-1882ix-24 (newer SAS/SATA)
>
> I can tell you that I just had to throw away Areca because it had exactly the
> problem you don't like: drives going offline for no good reason.
> I went back to MD with the very same drives in the very same box, online using
> the onboard SATA (6 ports) which works flawlessly.
> My impression is Areca has troubles with new big drives of 2 TB and above. The
> 1TB worked ok.
> I have some 3ware too, but did not check them with 2TB drives so far.
> I must say I would probably drop them only because current processors are
> faster with MD anyway. I just built a box with XEON E3-1280v2 with MD raid
> 4x2TB and I am impressed by the performance.

Yes, I prefer using HBA with MD too. MD is stable and has better performance.

6G HBA from LSI, PMC is known good quality.

Jack

> --
> Regards,
> Stephan
>