Is Bigger Better? (HDD)

A number of NVR manufacturers are beginning to take advantage of the new 3TB & 4TB Enterprise hard drives, to cram as much recording storage space as possible into their hardware's existing footprint.

But are there downsides to this approach?

The first obvious one that strikes me is 'having too many eggs in one basket' - ie if a 4TB (non-RAID) drive fails (yes even Enterprise drives can fail!) the amount of video evidence lost is significantly more.

RAID overhead. The rule of thumb that in a RAID-5 config you lose the capacity of one drive (plus a bit more) means that 32TB, configured as 8 x 4TB HDDs, will yield roughly 28TB at RAID-5, whereas the same config using 16 x 2TB drives will give you 30TB useable.

Another less obvious potential downside might be performance. And I say 'might' because it would need benchmarking first (hint - John?). Take the above example of 32TB RAID storage built on either 8 vs 16 HDDs. Fewer physical drives means more data r/w per drive for a set number of cameras/frame rate/resolution etc. Exacq Technologies note in their performance benchmarking KB that:

"Minimum disk quantity: Servers are tested with a typical disk quantity for each server model ..... Video storage is usually limited by disk input/output capacity; increasing the disk quantity increases the server's video storage rate."
https://crm.exacq.com/kb/?kbid=63800

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*****, ** *** ** *********** ********** ******* **** **** ********** *** **** ******- ********* *** ****** ********* ***** *** ******** ** ***** so ** ************.

* *** **** **** ;) ** ***** **** ** ** server/storage/hard ***** ******* ** *** ****** *** * ***'* ****** to ******* **** **** ***.

*******, ** **** (*****) ******* ***** *** *** ***** ***** on *** ****** ** ***/*** ****** **** ***** **********.

****** **** - * **** **** ****** **** **********, ** more ****** **** *** **** ** **** ** ********. ** does ****** ****** **** **** ************* **** **** *** ******** to ** **** ***** ****** ****** ********** ** *** *********. Could **** ** ** ************ ** *******, ******* ******* *** the **** ** ***** *** *** ******* (***, ***) ******, as *** ******** **** ****?

*****,

***** ** * ***** ** *** **** ****** ****** ** incorporated **** *** **** *****. ** **, *** *** ****** for ******* ***** *** **** ****** ** * *****, *** more ****** ******** ****** *** **** ** ** ***** **** failures ********** **************. ******* **** ******** ** *+* ** **+* in ***** *** *+* ** **+* ** *****.

****** **** **'* *** * ******** *******'** ********* ***'* (************* **** ******) ****** * *******, *******...

>

*****,

>

***** ** * ***** ** *** **** ****** ****** ** incorporated **** *** **** *****. ** **, *** *** ****** for ******* ***** *** **** ****** ** * *****, *** more ****** ******** ****** *** **** ** ** ***** **** failures ********** **************. ******* **** ******** ** *+* ** **+* in ***** *** *+* ** **+* ** *****.

>

****** **** **'* *** * ******** ** ** ***'** ********* URE's (************* **** ******) ****** * *******, *** ****...

*********** ***** ****, *** * **** *********** **** '****** ******' phenomenon ** ****** **** *****. * ******* *** ********* **-*** RAIDs ****** **** ***** ****** ** ****** *****, *** ***** about * ***** ** ********** **/* ********* ** ***** ********** see *** ***** ***** *******, ******** ***** ******* ** * second & *****. ****** **** *************** ******* **** * ******** *****-****. ***** **** ******* **** the *******, ** ***** **** **** ******** ** ** ***'* were ** **** ****-**** - *** **** ********** *** ***** kept ** **** ******* *** **** ** **** ** ******** the *******, **** ** *** ****** ** **** **** *** sectors ** *** ****** *** (****** ****** ******) *** ** they '*****-***' *** **** ******* ** *************. ******* ** ** took *** **** ******* *** ******** * *****/****** *******, **** of ***** ***'* **** ********.

********** ******* **** **** ******* ******* **** ***** - ********* 3 * *-*** - *** **** ** *** **** *** experience * ***** *******, ** ***** **** **** **** *******, replace *** ***** *** *** ** ***** ******* ****** ***** back ******. ***** *** ******* ******** **** ******* ******* ****** to ***** **** **************, ***** *** ****** ****** ** *** overall ********* ******.

"***** **** ******* **** *** *******, ** ***** **** **** appeared ** ** ***'* **** ** **** ****-**** - *** RAID ********** *** ***** **** ** **** ******* *** **** as **** ** ******** *** *******, **** ** *** ****** to **** **** *** ******* ** *** ****** *** (****** blocks ******) *** ** **** '*****-***' *** **** ******* ** unrecoverable. ******* ** ** **** *** **** ******* *** ******** a *****/****** *******, **** ** ***** ***'* **** ********."

*****, ****'* ***** ******. *'** **** *** **** **** ** thing ****** ** * ******* ** ***** (************ ******* ***-***** models), *** *** ******* ****** ********** **** ***** **** ****** at ****... **** ******** **! ****** ** ** ***** ****** for ******* ************* **** ******** *** **** ******** ***** ******* to *** ****, *** ** ******** ***** ** *** ** the *** *** ****** **** *** **** ** *******, **** is * ********* ******** ********.

*** ** *** ******** *********:

"*** ***** ******* *** **** ******* ** ** '****** *** many **** ** *** ******' - ** ** * *** (non-RAID) ***** ***** (*** **** ********** ****** *** ****!) *** amount ** ***** ******** **** ** ************* ****."

***** ***** **, *'** **** *** **** ********** ***** **** another ***** **** ** **** ** ******* ********. "****** * use *** *** *** ******, ** ***** **** * ***** of *****?" *** ** **. ****** ****, **'** ** ******** whether ** *********** *****-********* **** ******, ** **** ** **** good **' ******** *** ******...

"**** ********. *** **** ** ***** **** ** * ****-* config *** **** *** ******** ** *** ***** (**** * bit ****) ***** **** ****, ********** ** * * *** HDDs, **** ***** ******* **** ** ****-*, ******* *** **** config ***** ** * *** ****** **** **** *** **** useable."

** ******** ** ****'* ****** ***** "*********** *******" ** ***** populations, ******** *** **** **********: ** * ***** ********, * Western ******* *** ** "**********" ***** ***** ** ***** $***, while * *** ** ** $***. **** *** ***** **** = $****, **** *** ** *** = $****, ** ******* being * ******** **** ***** (*****, ****, *-*% ****?), **'* also *******. ****** ** ****** **** **** **** *********, **** power ********... *** **** **** * **-*** **** ** ***** to **** ************* **** **** ** *-*** ***** (*** ******** take ** **** **** ***** ** ****)...

**********, *** *** ** **** ***** $***, *** ** ** those ** ***** ***** **** *** *** **** **** ***** landing ***** ****** ****'* "***** ****", *** $**** :)

** ******, ** ***'** ******* ** ** ***** ** *****+**, you **** ** **-********* **********... :)

*****,

* ***** ***** **** ** *** ** **** **** ****** design. ***** *** ******** ****/**** ***** *********** *** **** ****** with ******* *** ********* **** ******, ***** ******* **** *** encountered *** **** ****** **** **** **** *** ** ********.

*** **** ** * ***. * ****** ** ******* ************* who ***** ** "****" ***** ********* ******** ***'*. *** *** problem ** ********** ** *** ***** * "***** ***** ******". That ** *** **** *** **** ********** ***** *** *** drive ** ******* **** ** ****** *** *****'* *****. *** problem **** ***** ***** ***** ******* (******* ** ***** * seconds) ** **** ****** *** ** **** ** ******* - especially **** **** *** ******* ************. *** *** ****** ** that *** ********** **** **** *** ****** **** *** ********* good.

*** ** *** "*****" ******* ** ** *** ** ****** and **-******* ****** **** **** *** ***** ****. ** **** come **** ** ** ******, **** ***** *** *****. *** problem * **** **** **** ** *******:

  • *** **** ***** *** ** ******* * *******, ****** ***** time ** ** ******* ** ******** ****.
  • *** *** ***** ******* ***** *** ****** **********, ********** ** storage ******* **** *** ***** ***** *** (**** ****).

* *** ** * *** ***-*** *** ****** * **** after *** **** ****** *** *********, *** "**** *****" ** drive ******** ****** **. ** ****** *** ********** * ****** of ****** ** **********. ********** ***** ******** ********** *** ** lost * ****** ** **** ******. ***** ********** *** ***** manufacturer (**), ** ******* **** **** *** * ***** ** drives **** *** "**** *******" ****** - ***********, *** ****/***** heads **** ****** *** *** *********.

***, *'** **** **** **** **** ** *** ****** ******* are **** ** ****** ******-*****-***** ** ** ***** ************* **** the *****. * ***'* ******* **** ** ******** **** * system ** ******* *********** *** ************, ** ** *** **** here. ** *** ****, ** * ***** ** ***** ********, I ****** ** *** *** ***** ************ **** **** ** and **** ****** *** ***** *** ****** ***** ***.

** *** ** ****** * ****** **** ** *** ** rebuild ***********, **** ** *** ** ****** ** *** ****.

***** ** * ***** ***** ****. *** ****** **** ****** get, *** ****** *** ******* ****. ** **** ******* *** used *** ************, **** ******* ********* **** ********* *** ******* bit ***** *** ********** ***** ** *** ***** *********** ****** rebuild. ************ ******* ****** ** ***** ******* ****** * ******* - **** **** ****** ** ***** ** ***% ** *** time ** ********.

********* *** ********** **** ** **** ** ***** ****** ******, RAID ********* ****** **** *** **** ******** *** ****-******** ************ storage. ***** *** ***** ********* *** *****. ********** : ** own ******* ************ * ************ ******* ***** ***** ***** * different ********, ** *'** *** *** ******** **** ** **** as *'* *** ****** ** **** **, **** ******* *********** technologies *** **********.

***** *** * ****** ** ************* ****** *********** ********** ** storage ****** *** *** ************ ******** *** ************. **** ** them **** ********* ******** ***, **** ** ****** **** ***********, lower ***** *********** *** *** ******* ** ****** *********** ***** for ********** ********. *** *** ***** ** **** **** ** these ******* *** ****** **** **** ***** **********, *** *****.

* ***** **** ** ***** ****** ****** *** ****** ** capacity, **'** *** ** ********** ***** **** **** ************ **** onto *****, **** ************ ***********-******** *******, ***** *** ******* ****** to *** *****. ************ **** **** ** * ***** ******* longer ********* *****, ***** ***** *********** *** ***** ******** ****** less ** ** ***** **** **** *******.

********,

*'* *** ** ****. * ***'* *** **** *********** ******* technologies ***** ************ **** ****-*****-***** ************ ********* *******. ****** *** course ** *** ****-**** *** *** ***********, *** *** ***/*** manufacturer ** ********** **** ********* **** ************ (***** **** *** one ******* *** ***** *** ******* ***** ****+**** ****** (*******)). Since * ***** **** ********* ********** *** ******** **********, ** least ****** ** ***** **** ** *********** ***** *******(*), * could **** ****** **** *** ************ **** *** *****. ****** that ** *** **** ** *** ******* *** - ******* manufacturers *** *** ******* ** *** ****** ********?

*** **** **** ******** ****** ******* ****** ******** *** ***(********** ********)*** ***** ******* ** ***** ********* *********** ****, *** **** a ****** ** ******: ***** ****** *** ******* ******* ******** after ************* *****-******* *** ******* "******" **** ***** (********* ***** Rebuilds *** "********* ****-**** ***** ********* & **********") *** **** have **** ***** ******* (** ** ** ****** *** ******* makes ***** *** ** ***).

** ****, *** ****** ** ***** **** ** ***** **** 60-bay ******* *** * ******** (******* ******** ** *******) ** have ********** ********** ***** **, **** ******** *********** *** **** data *****, * ******* **** ***** **** ** **+* *** a *** ***** ***** *** **** ** ****** ** ****. It ******* ** ** **** ** **** *** * ****** on ************ ******* *** *'** **** *** ****** *** ****** is ************.

* ****** ***** *** **** **** ******** ********** **** ** SSD. ******** ** ** *** ***** ***** *** *****-***** ************ storage, * ******* ** *** *** ********* ** ******* **** current ******* ******, ********* ********* * **** ********* ** ***** and ******* ************, ***** ******** ** * ******** ** *** current **** *** *********** ********* ** ****** ***********.

"************ ******* ****** ** ***** ******* ****** * ******* - they **** ****** ** ***** ** ***% ** *** **** as ********."

**, *** **** ****/**** *** ***** ********** *****? **'** ***** iSCSI-connected ***** **** ***** *********; *** ********* **** ***** *** internal **** ********** ** "*********" ******* **** ** **** **** if *** ******* ******* ***'* *********. **** ***** ** * have ** **** *** **** ******* *** * *******, *** DVR **** ********* ********* **********. **** ** *** **** *******-**** system * **** ** *** ***, * *** *** * solid **** *** ** * ****** *** ******** *****...


****,

**** **** ***** *** ***** *** ** *** ***** ** fast, ******** **** ****** ** **** * ***********.

* ******* **** ** **** ** ***** **** ******** **** Coldstore **** "**** ****" **** ***** ******* ****** ******. *** point *** **** **** **** **** ******** **** ******* **** loss ********** ****** *** ***** *******. ** * ***** ***** to **** **** ****** **** ******, *** **** ** ** could ** ****.

** *** ***, **** ****** ***** ******* ** ** ****** full ;-*

****'* *** "**** *** ********" ***** ******** ********* ** ** internal *****? **** ***** ** *****, **'* ********** ********... *** only "********" ** **** ** **** ***** ** *** **** isn't **********/******** ****** *** *******, *** ****'* * ********* *********.

******* ** *****. * **** "****, ******************"...

**** *******, * ***** ***** **** ******** ** *** ****** would **** * *********** **** - >** *****?

**** ****** **** * **** *********** *** *********** **********!

** *** ********* ** **** *** ******** ** ******** ***** large ******* ****** ***** ** ** ******* *** ****** ***** which ******** ******* **, ** **** **** *** **** **** controller *** **** ***** ***** *** ******** ***** *** *** when ******* ********** **** ******* ******* ** ****. ********** * 30TB **** ** *** ********** ***** ***** ********** ** * problem, ** *** **** ******* ***, *** ****** ***** **** rebuilds, *** **** ** ** **** ** ******* ***** ******** which ***** ***** *** ***** **** **********.

******* ******* ** **** ** **** **** ** ********* *** Exacq's ******* ** **.* ********* **** *********. ** ******* *** local ******* ** ** *** ** ******/*** **** ** * reasonable *-*** *** **** ****-********* ** ****** **** ****/* ****** a ******** **** ** *** ******** (** ** ***** *** retail/commercial ******* ***** ******) * ******* ** *** ** **** way ******** *** ******. ****, *** ******* ***** **** ** subjected ** ******* ** ******* **** ******, *** ****** *** RAID ** ** * ******* **** ********* * ***** ******, the ******* *** ** ********* ******* ************ **** *********. **** by ******* *** ****** ** * **** ********** ****, *** using ******* ******* ********** ***** (*** *** ********), ********** ****** times **** ** **** *******.

** ****** *** **** **** ****** **** **** *** *,* & *** ***** ***** ****** ***** ******* ***, ******* **** won't **** **** **** ****? :)

"******* ** *****. * **** "****, ******************"..."

** **** ** ****** *** ******** *** *** *** ****** them **, *'* ******** **** ** "********". ** *** ************* take *** **** ******* *** *** **** ** *********** *********, then *** ****** ** *** **** ****** ** *** ****; hence **** *****'* **** ** "**********".

** **** *****'* ******* ** **** ******.