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I'm using Ubuntu 18.04. My observation for ext4 file system is, once I cross the 90% of data usage the write performance crawls. We have a RAID6 configuration over 12 disks, total 90TB file system. For 81TB we experience 1400 MBps. Post that it drops down to 100 MBps. This drop is very sharp. Is there a way to make it less severe?
I'm exporting my ext4 volume as NFS share. To avoid write crawling after 90% usage, is there any way to force ENOSPACE error on NFS clients post filesystem crosses 90% usage.
1Same here (though it more like the last 1%). I suspect this is due to fragmentation, there is no continuous space big enough so your files get scattered all over the disk and you get a lot or arm movements. – xenoid – 2020-01-22T13:58:29.697