[CentOS] reboot - is there a timeout on filesystem flush?

[Les Mikesell]

On Wed, Jan 7, 2015 at 3:30 PM, John R Pierce <pierce at hogranch.com> wrote:
>>
>> Right... but only cost 133% (about) more than consumer drives, as opposed
>> to the 300% that the "server/enterprise" grade drives' cost.
>
>
> well, those $$$ drives are likely SAS rather than SATA, and that has other
> advantages...  10k or 15k RPM gives you up to double the IOPS per spindle of
> a 7200rpm SATA drive (and WD Reds are only 5900 RPM, I believe?)...   2.5"
> enterprise disks let you have more smaller spindles in the same space (24-25
> per 2U vs 12 for 3.5") for higher IO concurrency, and SAS supports
> multipathing (dual porting) for higher IO bandwidth, also SAS has tagged
> command queueing which often performs better than SATA NCQ under high IO
> concurrency workloads, like database servers.

These particular drives are enterprise SAS versions, but about as old
as they made them.

-- 
  Les Mikesell
    lesmikesell at gmail.com