Third test, using the full device, on linux 4.2.1 mkfs.f2fs -l COLD1 -o1 -a0 -d1 -s128 /dev/mapper/xmnt-cold1 mount -tf2fs -onoatime,flush_merge,active_logs=2,no_heap /dev/mapper/xmnt-cold1 /cold1
Unfortunately, mount failed with. The kernel showed that a high order allocation could not be satisfied: mount: page allocation failure: order:7, mode:0x40d0 ... F2FS-fs (dm-18): Failed to initialize F2FS segment manager (http://data.plan9.de/f2fs-mount-failure.txt) I think this memory management is a real problem - the server was booted about 20 minutes earlier and had 23GB free ram (used for cache). I was able to mount it by dropping the page cache, but clearly this shouldn't be neccessary. After this, df showed 185GB in use, which is more like 3%, not 1% - again overprovisioning seems to be out of bounds. I started copying files with tar|tar, after 10GB, I restarted, which started to overwrite the existing 10GB files. Unfortunately, this time the GC kicked in every 10-20 seconds, slowing down writing times. I don't know what triggered it this time, but I am quite sure at less than 1% utilisation it shouldn't feel the need to gc while the disk is busy writing. After 90GB were written, I decided to simulate a disk problem by deleting the device (to avoid any corruption issues the disk itself might have): echo 1 >/sys/block/sde/device/delete After rescanning the device, I used fsck.f2fs on it, and it failed quickly: Info: superblock features = 0 : Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000 Info: total FS sectors = 15628050432 (7630884 MB) Info: CKPT version = 2 [ASSERT] (restore_node_summary: 688) ret >= 0 [Exit 255] Re-running it with -f failed differently, but also quickly: Info: superblock features = 0 : Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000 Info: total FS sectors = 15628050432 (7630884 MB) Info: CKPT version = 2 [ASSERT] (get_current_sit_page: 803) ret >= 0 [Exit 255] I'll reformat and try without any simulated problems. -- The choice of a Deliantra, the free code+content MORPG -----==- _GNU_ http://www.deliantra.net ----==-- _ generation ---==---(_)__ __ ____ __ Marc Lehmann --==---/ / _ \/ // /\ \/ / schm...@schmorp.de -=====/_/_//_/\_,_/ /_/\_\ ------------------------------------------------------------------------------ _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
