The ReadyNAS Duo brings most of the extensive ReadyNAS feature set to a lower-cost dual-drive compact NAS. [article link]
This is the response I received from Netgear. The file system used by the ReadyNAS is EXT3.After reading the very positive review here on the Netgear Readynas Duo, I was considering purchasing one to replace my current NAS (WD Netcenter, unfortunately), however, I later read that the Readynas Duo (and MV+) use a "proprietary" filesystem (ext3 with 16k blocks) that would not be able to be read by any x86-based hardware.
The article seem to suggest that you are not able to easily recover or read your data from a regular computer using the disks from a ReadyNas Duo which had suffered a crash.
So what is the benefit of having a ReadyNas Duo in RAID 1 if it is so difficult to recover data if the NAS crashes instead of the disks?
Thanks Bill for your response.
So you now have backup NASes for each other.
Do you still run RAID on any one of them?
Which mode of RAID do you run & why?
I am trying to figure out if I should run my primary NAS on RAID 1 or 5 & have a backup NAS without any RAID.
Nope, but I can ask. But, first, let's make sure I know what you want.Any idea what block size Synology, Qnap and Thecus are currently using?
It sure seems that Netgear jumped prematurely to 16K blocks. 4K blocks support up to 8TB arrays and that covers even the new Readynas Pro equipped with 1.5TB drives in XRAID mode.
Nope, but I can ask. But, first, let's make sure I know what you want.
I have found that people tend to use chunk/block/stripe interchangeably.
Chunk / stripe size (I know it's not the same as block) for Thecus is 64K.
FYI, 16K page/block size allows for faster performance especially with our custom NSP. There's also advantage in terms of providing better prevention against fragmentation. Recovery can be performed on any Sparc or IA-64 (Itainium)-based systems as someone posted, but it can also be done by any ReadyNAS running on that processor (600, X6, 1100, NV, NV+, Duo), and if you don't want to purchase a new system, there's plenty in the field where you should be able to get a used one off Ebay. That said, NETGEAR warranties the Duo for 3 years, and 5 years for NV+, 1100, and the Pro, so if anything happens during that time, NETGEAR Support can help with recovery. Beyond that, NETGEAR offers recovery service at a *very* reasonable price.
I hope that helps, and please let me know if you have further questions.
The memory management architecture in 2.6 kernel used in V4 differed enough from 2.4 in V3 such that we had to recoup by using a larger page/block size. So if we had stuck to 4K page size, performance would not have been close to where it is today.If you had 2 NV+ units configured the same, can you show a measurable performance improvement between 1) NV+ running RADIATOR V3.x with 4KB blocks and 2) another NV+ with RADIATOR V4.x with 16KB blocks?
Well, that's the options. But if somehow your Duo would blow up and your disks were still intact, your easiest option is to get a replacement diskless Duo -OR- NV+ and you'd be good to go.How many end users do you know with a Sparc workstation and/or Itanium machine? I know a grand total of 0!
Your point taken, but in the grand scheme of things, you are covered for at minimum 3 years (check warranty of other NAS) in case your ReadyNAS self-destructs. Frankly I can think of only 1 case in the last 4 years where that would have happened. The SOC, motherboard, and backplanes are pretty simple and reliable. Typical failures are confined to disk, PSU, or the fan, any of which would be end-user replaceable.Is it really worth the tradeoff where you take away the end users ability to read a disk on another system?
Diskless Duo? Where can I get such a beast?
If you had 2 NV+ units configured the same, can you show a measurable performance improvement between 1) NV+ running RADIATOR V3.x with 4KB blocks and 2) another NV+ with RADIATOR V4.x with 16KB blocks?
How many end users do you know with a Sparc workstation and/or Itanium machine? I know a grand total of 0!
Is it really worth the tradeoff where you take away the end users ability to read a disk on another system?
Hi yoh-dah - Thanks for the great input. Just a minor question - what does NSP stand for? Network Storage Processor?
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