Surprised to hit a limit when handling a modest Maildir case; does this reflect a bug? rsync'ing to a new mail server, after fewer than 100,000 files there are intermittent failures: rsync: [receiver] open "/home/mark/Maildir/.robot/cur/1633731549.M990187P7732.yello.[redacted],S=69473,W=70413:2," failed: No space left on device (28) rsync: [receiver] rename "/home/mark/Maildir/.robot/cur/.1624626598.M748388P84607.yello.[redacted],S=17049,W=17352:2,.oBphKA" -> ".robot/cur/1624626598.M748388P84607.yello.[redacted],S=17049,W=17352:2,": No space left on device (28) The kernel: EXT4-fs warning (device dm-4): ext4_dx_add_entry:2351: Directory (ino: 225811) index full, reach max htree level :2 EXT4-fs warning (device dm-4): ext4_dx_add_entry:2355: Large directory feature is not enabled on this filesystem Reaching for 'large_dir' seems premature as this feature is reported as useful for 10M+ files, but this is much lower. A 'bad' filename will fail consistently. Assuming the 10M+ absolute limit, is the tree grossly imbalanced? Intuitively, 'htree level :2' does not sound particular deep. The source folder is 195,000 files -- large, but not crazy. rsync eventually hit a ceiling having written 177,482 of the files. I can still create new ones on the command line with non-Maildir names. Ruled out quotas, by disabling them with "tune2fs -O ^quota" and remounting. See below for additional info. -- Mark $ uname -a Linux floyd 5.10.78-0-virt #1-Alpine SMP Thu, 11 Nov 2021 14:31:09 +0000 x86_64 GNU/Linux $ mke2fs -q -t ext4 /dev/vg0/home $ rsync -va --exclude 'dovecot*' yello:Maildir/. $HOME/Maildir $ ls | head -15 1605139205.M487508P91922.yello.[redacted],S=7625,W=7775:2, 1605139440.M413280P92363.yello.[redacted],S=7632,W=7782:2, 1605139466.M699663P92402.yello.[redacted],S=7560,W=7710:2, 1605139479.M651510P92421.yello.[redacted],S=7474,W=7623:2, 1605139508.M934351P92514.yello.[redacted],S=7626,W=7776:2, 1605139596.M459228P92713.yello.[redacted],S=7559,W=7709:2, 1605139645.M57446P92736.yello.[redacted],S=7632,W=7782:2, 1605139670.M964535P92758.yello.[redacted],S=7628,W=7778:2, 1605139697.M273694P92807.yello.[redacted],S=7632,W=7782:2, 1605139748.M607989P92853.yello.[redacted],S=7560,W=7710:2, 1605139759.M655635P92868.yello.[redacted],S=5912,W=6018:2, 1605139808.M338286P93071.yello.[redacted],S=7628,W=7778:2, 1605139961.M915501P93235.yello.[redacted],S=7625,W=7775:2, 1605140303.M219848P93591.yello.[redacted],S=6898,W=7023:2, 1605140580.M166212P93921.yello.[redacted],S=6896,W=7021:2, $ touch abc [success] $ touch 1624626598.M748388P84607.yello.[redacted],S=17049,W=17352:2, touch: cannot touch '1624626598.M748388P84607.yello.[redacted],S=17049,W=17352:2,': No space left on device $ dumpe2fs /dev/vg0/home Filesystem volume name: <none> Last mounted on: /home Filesystem UUID: ad26c968-d057-4d44-bef9-1e2df347580e Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 5225472 Block count: 21229568 Reserved block count: 851459 Overhead clusters: 22361 Free blocks: 8058180 Free inodes: 4799979 First block: 1 Block size: 1024 Fragment size: 1024 Group descriptor size: 64 Reserved GDT blocks: 96 Blocks per group: 8192 Fragments per group: 8192 Inodes per group: 2016 Inode blocks per group: 504 Flex block group size: 16 Filesystem created: Mon Nov 8 13:14:56 2021 Last mount time: Fri Nov 12 18:43:14 2021 Last write time: Fri Nov 12 18:43:14 2021 Mount count: 27 Maximum mount count: -1 Last checked: Mon Nov 8 13:14:56 2021 Check interval: 0 (<none>) Lifetime writes: 14 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 32 Desired extra isize: 32 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 839d2871-b97e-456d-9724-096db15931b8 Journal backup: inode blocks Checksum type: crc32c Checksum: 0x5974a8b1 Journal features: journal_incompat_revoke journal_64bit journal_checksum_v3 Total journal size: 4096k Total journal blocks: 4096 Max transaction length: 4096 Fast commit length: 0 Journal sequence: 0x00000a2a Journal start: 702 Journal checksum type: crc32c Journal checksum: 0x4d693e79
