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On Sep 15, 2014 7:24 PM, ToddAndMargo <[email protected]> wrote:
>> On Sep 15, 2014 7:07 PM, ToddAndMargo <[email protected]> wrote:
>>
>> Hi All,
>>
>> I have a customer whose with a long term project which
>> includes about 30 IP cameras. He wants to both view and
>> record. Anyone know or have a favorite Linux server
>> for such?
>>
>> Many thanks,
>> -T
>>
On 09/15/2014 04:17 PM, Paul Robert Marino wrote:
> Look at the ones that specialize as a DVR there are a few of them but
> off the top of my head I can't remember the name of the software
> involved. But there are a few distros that specialize in this. A warning
> though with that many feed you will probably need a hefty RAID which may
> need an external disk enclosure at the least just to get the bandwidth
> from striping across a sufficient number of spindals and SSD's won't
help.
Hi Paul,
What is your technical opinion of SATA vs SAS in this
type of application (tons of data constantly flowing)?
-T
On 09/15/2014 04:58 PM, Paul Robert Marino wrote:
There is surprisingly little difference between the two. The primary
difference is SAS controllers then to be better and the stats on the
disk themselves tend to be more honest.
when talking about SATA the real question is are you talking about
standard retain or nearline.
Retail sata drives stats are based on inherine instability at the
write cache layer and burst rates based on the cache used as a write
buffer. An fsync on a retail sata drive lies to youand says its complete
when it hits the write cache. Nearline is honest about fsyncs.
Sas is honest across the board and they tend to be higher production
quality drives with lower failure rates and run at higher rpm's and
therefore are faster.
That said if you compare a nearline SATA and a SAS disk at the same
number of RPM's you get relatively the same performance but the SATA
drive is cheaper.
That said it comes down to service contracts with manufacturers. If you
don't intend to have one SAS definitely pays off. If you have a good
service contract and all other specs, all other specs are equal and you
don't mind swapping out disks more often SATA nearline is the way to go.
-- Sent from my HP Pre3
Hi Paul,
Somewhere in the back of my memory I remember that SAS could do
multiple reads and writes on a single pass.
-T
