Am 13.08.20 um 00:45 schrieb Andreas Dilger: > On Aug 10, 2020, at 6:37 AM, Maciej Jablonski <mafjmafj@xxxxxxxxx> wrote: >> On upgrading from centos 7.6 to centos 8.2 mkfs slowed down by orders >> of magnitude. >> >> e.g. 35GB partition from under 8s to 4m+ on the same host. >> >> Most time is spent on writing the journal to the disk. >> >> strace shows the following: >> >> We have got strace which shows that each each block is zeroed with >> fallocate and each >> invocation of fallocate takes 10ms, this accumulates of course. > > Do you really need to use mkfs.ext3, or can you use mkfs.ext4 and > mount the filesystem as type ext4? Then you can use the "flexbg" > feature and it will not only speed up mkfs but also many other > normal operations (e.g. mount, e2fsck, allocation, etc) typo: it's "flex_bg" and enabled by default (Filesystem created: Sun Aug 9 13:24:15 2020) 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 ext3 is something of the past for a full decade now
