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

[Marti]

** Package changed: ubuntu => partman-base (Ubuntu)

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https://bugs.launchpad.net/bugs/1278875

Title:
  XFS filesystem created with 4k sectors by installer on LSI SAS RAID

Status in “partman-base” package in Ubuntu:
  New

Bug description:
  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.

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