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| Started by | Daniel Pocock <daniel@pocock.pro> |
|---|---|
| First post | 2017-12-28 09:40 +0100 |
| Last post | 2017-12-28 09:40 +0100 |
| Articles | 1 — 1 participant |
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Bug#885575: md: potentially incorrect warnings about alignment Daniel Pocock <daniel@pocock.pro> - 2017-12-28 09:40 +0100
| From | Daniel Pocock <daniel@pocock.pro> |
|---|---|
| Date | 2017-12-28 09:40 +0100 |
| Subject | Bug#885575: md: potentially incorrect warnings about alignment |
| Message-ID | <v1BTj-5WH-1@gated-at.bofh.it> |
Package: linux Version: 4.13.13-1~bpo9+1 Looking at the output of dmesg, I see warnings like this: md0: Warning: Device sde3 is misaligned Checking the same disk with parted tells me it is aligned correctly: # parted /dev/sde GNU Parted 3.2 Using /dev/sde Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) align-check optimal 3 3 aligned Checking the disk with "fdisk -l" shows me: # fdisk -l /dev/sde Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes When the same disk is attached through a USB HDD dock, the "fdisk -l" output gives a different value for optimal I/O size: # fdisk -l /dev/sdb Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 33553920 bytes => 33553920 / 512 = 65535 sectors of 512 bytes When I partitioned the disk, I used MiB alignment (multiple of 2048 sectors of 512 bytes each) Is the warning from the md kernel module misleading or is parted align-check wrong? Can the warning be made more verbose to indicate why it believes the partition is not aligned correctly?
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