Arch Linux

0xADADA

Member

From: ██████, MA, USA

Registered: 2016-03-08

Posts: 8

Website

[sdb] No Caching mode page found

Hi folks,

Right after systemd-boot (formerly gummiboot) presents the boot-menu, I'm prompted to type in my disk-encryption password. While typing, I always get a string of errors that overwrite the scree. You can see it in the attached image:

[sdb] No Caching mode page found
[sdb] Assuming drive cache: write through

The full problem is visible here:
https://i.imgur.com/FZTGPag.jpg

I can continue to type the password, and then the system boots up fine, but i'm a bit  concerned about this error, or really just want to fix the problem, or at least understand whats causing it.

The system is an Apple MacBook Pro 8,2 (Early-2011). Its running LVM over LUKS on a Samsung 500G SSD drive on /dev/sda.

If you're interested in exactly how I've partitioned the drive, i wrote up an article of the exact steps I used to install arch linux, over here: https://visual-assault.org/2016/03/05/i … hard-drive

fdisk -l

Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 26F9DE70-32E9-43E2-B82C-BB87F42CFA1C

Device         Start       End   Sectors   Size Type
/dev/sda1         40    409639    409600   200M EFI System
/dev/sda2     409640 487683495 487273856 232.4G Apple Core storage
/dev/sda3  487683496 488953031   1269536 619.9M Apple boot
/dev/sda4  489215176 976773134 487557959 232.5G Linux LVM




Disk /dev/mapper/vgcrypt: 232.5 GiB, 249627577856 bytes, 487553863 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vgcrypt-root: 60 GiB, 64424509440 bytes, 125829120 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vgcrypt-home: 172.5 GiB, 185199493120 bytes, 361717760 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

cat /etc/fstab

 cat /etc/fstab 
# 
# /etc/fstab: static file system information
#
# <file system> <dir>   <type>  <options>       <dump>  <pass>
# /dev/mapper/vgcrypt-root UUID=9a628dc2-183a-45f0-94e8-a02a65fb0d12
/dev/mapper/vgcrypt-root        /               ext4            discard,rw,relatime,data=ordered   0 1

# /dev/mapper/vgcrypt-home UUID=0fb45fe2-8304-48fa-8f53-f7e8d899316b
/dev/mapper/vgcrypt-home        /home           ext4            discard,rw,relatime,data=ordered   0 2

# /dev/sda1 UUID=67E3-17ED
LABEL=EFI               /boot           vfat            rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro       0 2

any help? thanks!

Last edited by x33a (2016-03-08 04:55:34)

x33a

Forum Fellow

Registered: 2009-08-15

Posts: 4,587

Re: [sdb] No Caching mode page found

@0xADADA,

welcome to the forums. Please don't post oversized images.

https://wiki.archlinux.org/index.php/Fo … s_and_code

As for the problem, it doesn't really look to be a problem. It seems like normal kernel messages. What do you have on /dev/sdb? Instead of posting a link to a site, post all the relevant details here.

0xADADA

Member

From: ██████, MA, USA

Registered: 2016-03-08

Posts: 8

Website

Re: [sdb] No Caching mode page found

/dev/sdb is a Samsung evo 850 500G SSD drive. If you need any other info beyond the above, let me know.

Last edited by 0xADADA (2016-03-08 19:47:37)