Re: wiki about block alignment issues
Daniel Pocock <daniel@pocock.pro> writes:
> I've started a wiki about block alignment issues:
>
> https://wiki.debian.org/DiskBlockAlignment
>
> Can anybody comment on specific packages / tools that may help people
> investigate or update their systems, maybe adding links to the wiki?
"lsblk" (one of several ls$something commands) in the "util-linux"
package is very helpful. It can show multiple fields, and has values
for both storage and discard.
ceph-osd-123# lsblk --output NAME,TYPE,ALIGNMENT,PHY-SEC,LOG-SEC,DISC-ALN,DISC-GRAN
NAME TYPE ALIGNMENT PHY-SEC LOG-SEC DISC-ALN DISC-GRAN
sda disk 0 512 512 0 0B
├─sda1 part 0 512 512 0 0B
└─sda2 part 0 512 512 0 0B
├─vg0-swap lvm 0 512 512 0 0B
├─vg0-root lvm 0 512 512 0 0B
├─vg0-srv lvm 0 512 512 0 0B
├─vg0-tmp lvm 0 512 512 0 0B
├─vg0-home lvm 0 512 512 0 0B
├─vg0-varbackups lvm 0 512 512 0 0B
├─vg0-varlog lvm 0 512 512 0 0B
└─vg0-ceph lvm 0 512 512 0 0B
sdc disk 0 512 512 0 0B
├─sdc1 part 0 512 512 0 0B
└─sdc2 part 0 512 512 0 0B
sdd disk 0 512 512 0 0B
├─sdd1 part 0 512 512 0 0B
└─sdd2 part 0 512 512 0 0B
[...]
laptop-with-crypto# lsblk --output NAME,TYPE,ALIGNMENT,PHY-SEC,LOG-SEC,DISC-ALN,DISC-GRAN
NAME TYPE ALIGNMENT PHY-SEC LOG-SEC DISC-ALN DISC-GRAN
sda disk 0 512 512 0 512B
├─sda1 part 0 512 512 0 512B
├─sda2 part 0 512 512 0 512B
├─sda3 part 0 512 512 0 512B
└─sda4 part 0 512 512 0 512B
└─sda4_crypt crypt 0 512 512 0 512B
sdb disk 0 4096 512 0 0B
├─sdb1 part 0 4096 512 0 0B
├─sdb2 part 0 4096 512 0 0B
├─sdb3 part 0 4096 512 0 0B
├─sdb4 part 0 4096 512 0 0B
├─sdb5 part 0 4096 512 0 0B
├─sdb6 part 0 4096 512 0 0B
└─sdb7 part 0 4096 512 0 0B
--
Stig Sandbeck Mathisen <ssm@debian.org>
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