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Forum Discussion
EXT3 vs EXT4
I have not upgraded to 4.2.22 yet since the only benefit for me would be support for EXT4. The other fixes don't apply to how I use the NAS currently and of course I don't want to take a chance on introducing other bugs. That being said, how much of a performance boost would one realize using EXT3 compared to EXT4? Would it be worth reformatting my existing USB drive and re-backing up about 1.7TBs of data? Has anyone actually test transfer speeds on both formats using the same drive and the same sizable file(s)? If so, I like to see those results.
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- Was this array setup in your Ultra or in an older model. EXT4 has always been the default filesystem for the Ultra so unless you migrated an array from an older model you would have native EXT4.
What version of RAIDiator are you running?
If you download your logs (Status > Logs > Download all logs) and extract the zip contents what does initrd.log look like? - Per the release notes, 4.2.22 adds ext4 support for USB drives - and that is what I think NASguru is asking about.
- Ah, good point. Should have noticed which forum it was in.
Unless you are having problems backing up to your EXT3 formatted USB disk I can't see much point changing to using EXT4. EXT4 adds support for files larger than 2TB in size and volumes above 16TB in capacity amongst other things. The first wouldn't be needed by many users and the latter is impossible with the USB drives available today. mdgm wrote: Ah, good point. Should have noticed which forum it was in.
Unless you are having problems backing up to your EXT3 formatted USB disk I can't see much point changing to using EXT4. EXT4 adds support for files larger than 2TB in size and volumes above 16TB in capacity amongst other things. The first wouldn't be needed by many users and the latter is impossible with the USB drives available today.
Well, I was having issues initially with the NAS disconnecting from my external USB drive after running a backup job. However, I got that all sorted out. I don't have any files larger than 2TB so that wouldn't be an issue with the current format of EXT3. :D I was just more curious what performance increase if any would be realized using EXT4 over EXT3 and it doesn't sound like there is any. Per my Rsync calculation in the logs, I'm seeing about 28 MB/s - 29 MB/s on transfer speeds for files over 3GB in size. Per Wikipedia: USB 2.0: Released in April 2000. Added higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 MBit/s) (now called "Hi-Speed"). In short, I'm close to the effective throughput rate and hence why I asked.- Well there are some overheads. You may find EXT4 is quicker (not sure) but it wouldn't be that much
mdgm wrote: Well there are some overheads. You may find EXT4 is quicker (not sure) but it wouldn't be that much
That's what I thought as well.
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