Format SAS raid? DVRAID?

[Warwick Teale]

HI Jason, I’d agree that 300+MB/sec is slow but my observations are not from NOT using the AJA system test tool.app just some basic non capture workflows (finder and shell commands for moving stuff round and FCP work, compressor.app and motion.app etc).

I also only have 2 groups x (4 x 1TB WDC1002’s , 4 x WDC5000’s 500GB ) each R380 group, not 8 x DDMs.

R380 HBA on slot4 (x4 mode)

Using the AJA System Test tool for DVCPROHD1080/50 4GB object on BOTH of these 4 by RAID0 groups I get:

(a) group01 RAID0 striped over 4 x 1TB of 7200RPM WDC1000-YS with results when
• disable file system cache is ON (ticked): WRITES=390MB/sec and READS=430MB/sec

(b) group02 RAID0 striped over 4 x 500GB of 7200RPM WDC5000YS with results when
•  disable file system cache is ON (ticked): WRITES=279MB/sec and READS=261MB/sec

Shoudl I get time to tie all these WDC DDMs and configure a new 8x GROUP into an 8 x Raid0 on the PROAVIO E8MS JBOD enclosure after i arcive the objects, I think I will se at least a 50% inprovement in the realm of 500MB/sec as other are seeing.

However for my workflows this is fine.

As for the original post my ATTO TEch R380 SAS HBA is on SLOT4 as an x4 lane. works great!

(i also have an LSI SAS 3442E-R in slot 3 as an x4 lane in MACPRO because I have some SAS ULTRIUM LSO tape drives attached from time to time).

hth

w

[Jim Curtis]

I’m reviving a two year old thread, because I have the same question as the OP, which didn’t get answered. But, after two years, maybe somebody actually has used DVRAID, and can comment on it.

ATTO claims, “breakthrough performance for a parity protected solution.” And from a company FAQ:

Q: What is DVRAID™?
A:

DVRAID™ is ATTO’s proprietary technology which is optimized for digital content creation environments which require protection in the event of a disk failure without the performance penalty traditionally seen with parity RAID. DVRAID supports the editing of 4k film, multiple 2k film streams, multiple uncompressed high definition (HD) video and multiple streams of real-time, uncompressed standard definition (SD) video.

I was thinking that RAID 5 was typically the solution for video editing, but I can’t find a lot of info on-line about DVRAID.

Jim Curtis
jamesphilipcurtis.com

MacPro (Harpertown-Early 2008) 2×4 3GHz; 32G RAM all the same brand; Dual Boot: 10.6.3 & 10.5.8; QT 7.6.6; FCS3; Kona LHi in PCI slot 3 (7.5.1); Primary display: 30″ ACD; Secondary: HP LP2480zx DreamColor (A) via AJA HDP2 SDI to HDMI converter and (B) DVI from MacPro.

[Jason Levy]

I was told by ATTO recently that raid 5 is now preferred to DVraid. That’s what we are using.

[Jim Curtis]

Interesting. Did he or she happen to give you a reason? Just curious.

Thanks.

Jim Curtis
jamesphilipcurtis.com

MacPro (Harpertown-Early 2008) 2×4 3GHz; 32G RAM all the same brand; Dual Boot: 10.6.3 & 10.5.8; QT 7.6.6; FCS3; Kona LHi in PCI slot 3 (7.5.1); Primary display: 30″ ACD; Secondary: HP LP2480zx DreamColor (A) via AJA HDP2 SDI to HDMI converter and (B) DVI from MacPro.

[Jason Levy]

I was told that DVraid was a kind of stopgap thing that was invented at the time to fill a certain need but that now has been superseded by Raid 5. Call up ATTO tech support and you can get more detail. They are great. Spent a lot of time on the phone with me and answered all my questions.

[John Fishback]

I tested both and RAID5 was as good or slightly better. We went RAID5 as it was more common and tried-and-true.

John

MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.8 QT7.6.4 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24″ TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)

Pro Tools HD w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN