On 28 Jul 2014 at 10:48, Lukás Czerner wrote: > On Tue, 22 Jul 2014, vicentiu.neagoe@xxxxxx wrote: > > > Date: Tue, 22 Jul 2014 19:34:10 +0300 > > From: vicentiu.neagoe@xxxxxx > > To: linux-ext4@xxxxxxxxxxxxxxx > > Subject: resilience against power loss > > > > Hello, > > > > I'm trying to configure ext4 to prevent data corruption in case of a > > power loss. > > > > I test by doing a cold reset right after writing to a file. > > I tried the nodelalloc option, but the file still becomes corrupted > > with trailing garbage. > > > > Using ext3, I either get the old version of the file, or the new > > version, and there is no corruption. > > > > Does nodelalloc not guarantee data integrity? > > > > Are there any other options that provide complete resilience against > > power loss? > > Well, that would be fsync. It'll make sure that your data actually reach > disk and that the disk actually write it from the cache to platters. I don't have control over how the applications were written, yet I need the system to not corrupt or lose data in case of a power loss. I have the partition mounted with the sync option but the issue still reproduces. Are there no options on ext4 to provide the same data integrity as data=ordered on ext3? I also tested with Btrfs and there is no data corruption on a power loss. Vicentiu > -Lukas > > > > > thanks > > > > Vicentiu > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
