Hi Eugen,
Indeed the optimal IO value (on sdc) seems a little weird. Yet this
should not create any alignment warnings.
zuluCrypt-1001-NAAN-sdc4-1790378342: 0 11406264975 - Now this is not 4k
aligned (sectors must be divideable by 8 to be 4k aligned). Indeed the
encrypted payload should start at 11406264976 sectors, so there is a -1
sector misalignment (See lsblk output saying so). VeraCrypt did not
properly align the payload when the container was created, I assume.
Regards
-Sven
Am 10.01.2016 um 01:25 schrieb Eugen Rogoza:
Hi,
Reporter should paste output of "lsblk -t" with device activated to check what underlying
device report alignment limits are violated in storage stack).
I am the reporter and the output of 'lsblk -t' with encrypted partition mounted is below. sda2 is the one that works fine, sdc4 is the one that throws alignment warnings.
root@nuc:~> lsblk -t
NAME ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED RQ-SIZE RA WSAME
sda 0 4096 0 4096 512 1 cfq 128 128 0B
├─sda1 0 4096 0 4096 512 1 cfq 128 128 0B
└─sda2 0 4096 0 4096 512 1 cfq 128 128 0B
└─zuluCrypt-1001-NAAN-sda2-4071757814 0 4096 0 4096 512 1 128 128 0B
sdb 0 512 0 512 512 0 noop 128 128 0B
├─sdb1 0 512 0 512 512 0 noop 128 128 0B
├─sdb2 0 512 0 512 512 0 noop 128 128 0B
├─sdb3 0 512 0 512 512 0 noop 128 128 0B
└─sdb4 0 512 0 512 512 0 noop 128 128 0B
sdc 0 4096 33553920 4096 512 1 cfq 128 128 32M
├─sdc1 0 4096 33553920 4096 512 1 cfq 128 128 32M
├─sdc2 0 4096 33553920 4096 512 1 cfq 128 128 32M
├─sdc3 0 4096 33553920 4096 512 1 cfq 128 128 32M
└─sdc4 0 4096 33553920 4096 512 1 cfq 128 128 32M
└─zuluCrypt-1001-NAAN-sdc4-1790378342 -1 4096 0 4096 512 1 128 128 0B
That is indeed true and further info including 'dmsetup table' will be
necessary to tell what is really going on.
Output below. Again, sdc4 is the problematic one.
root@nuc:~> dmsetup table
zuluCrypt-1001-NAAN-sdc4-1790378342: 0 11406264975 crypt aes-xts-plain64 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 256 8:36 256
zuluCrypt-1001-NAAN-sda2-4071757814: 0 1324371456 crypt aes-xts-plain64 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 256 8:2 256
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