[Bug 1278875] [NEW] XFS filesystem created with 4k sectors by installer on LSI SAS RAID

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After installing Ubuntu 13.10 Server on a server (Fujitsu PRIMERGY RX300
S8) with the LSI SAS 2008 RAID controller (Fujitsu D2607) and
configuring it to use the XFS filesystem, the FS is created with sector
size set to 4 kilobytes. The installer should respect the sector size of
the underlying hardware.

XFS refuses O_DIRECT accesses that are not a multiple of the configured
sector size, breaking assumptions made in some software that uses
O_DIRECT, such as libvirt disks using cache=none, and the the PostgreSQL
pg_test_fsync utility (didn't try running Postgres with open_sync):
http://www.postgresql.org/message-id/CABRT9RBkfUPjemsA-
jhQ=ME0TCLGgNK6FfyWkaNw+xGbykg1Sw at mail.gmail.com

Partition after installation:
# xfs_info /dev/sda1
meta-data=/dev/disk/by-uuid/987c0579-bd67-4f80-bbc6-50f975ee4c1d
isize=256    agcount=16, agsize=4341104 blks
         =                       sectsz=4096  attr=2
[...]                                   ^^^^

Yet kernel knows that the underlying storage has 512-byte sectors:
# cat /sys/block/sda/queue/logical_block_size
512
# cat /sys/block/sda/queue/physical_block_size
512

Even a new fresh filesystem created with mkfs.xfs defaults uses 512B sectors:
# mkfs.xfs /dev/sda5
meta-data=/dev/sda5              isize=256    agcount=4, agsize=489856 blks
         =                       sectsz=512   attr=2, projid32bit=0
[...]                                   ^^^

This can be reproduced by manually specifying sector size:
mkfs.xfs -s size=4096

# lspci |grep -i raid
01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2008 [Falcon] (rev 03)

After re-creating my root partition with XFS defaults, the issues are no
longer occurring.

** Affects: partman-base (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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XFS filesystem created with 4k sectors by installer on LSI SAS RAID
https://bugs.launchpad.net/bugs/1278875
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