Package: dosfstools Version: 3.0.16-2 Severity: wishlist Tags: upstream
Hi Daniel. I hope my understanding of FAT isn't all too wrong, but AFAIU, the logical sector size (i.e. -S switch) is analogous to the block size in e.g. ext*, right? If so,.. wouldn't it make sense (for performance reasons) to try to set these to the block size of the underlying device, which in case of upcoming HDDs would be 4 KiB... Ideally, of course, mkdosfs would use device topology information (well at least on modern Linux kerne), to determine both, the ideal sector size, as well as their alignment. That would expose the necessary information even as it's modified through the different block layers, e.g.: # lsblk -t NAME ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED RQ-SIZE sda 0 512 0 512 512 0 cfq 128 └─sda1 0 512 0 512 512 0 cfq 128 ├─vg_system-root (dm-0) 0 512 0 512 512 0 128 │ └─root (dm-2) 0 512 0 512 512 0 128 └─vg_system-swap (dm-1) 0 512 0 512 512 0 128 sdb 0 512 0 512 512 1 cfq 128 └─sdb1 0 512 0 512 512 1 cfq 128 loop0 0 512 0 512 512 1 128 (which here uses filesystem on top of dmcrypt, on top of LVM on top of partitions. btw: I tried to manually set the sector size to 4096 but that seems to cause troubles: # mkfs.vfat -v -S 4096 -F 32 -n "ESP" /dev/loop0 mkfs.vfat 3.0.16 (01 Mar 2013) Loop device does not match a floppy size, using default hd params WARNING: Not enough clusters for a 32 bit FAT! /dev/loop0 has 64 heads and 32 sectors per track, logical sector size is 4096, using 0xf8 media descriptor, with 131072 sectors; file system has 2 32-bit FATs and 8 sectors per cluster. FAT size is 16 sectors, and provides 16376 clusters. There are 32 reserved sectors. Volume ID is abde448e, volume label ESP . What's the problem here? Cheers, Chris. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
