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Diffstat (limited to 'man/lvm.conf.5.in')
| -rw-r--r-- | man/lvm.conf.5.in | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/man/lvm.conf.5.in b/man/lvm.conf.5.in index 7b3ee228..6f03507b 100644 --- a/man/lvm.conf.5.in +++ b/man/lvm.conf.5.in @@ -137,11 +137,23 @@ has been reused without wiping the md superblocks first. directly upon an md device, LVM2 will align its data blocks with the md device's stripe-width. .IP +\fBdata_alignment_detection\fP \(em If set to 1, and your kernel provides +topology information in sysfs for the Physical Volume, the start of data +area will be aligned on a multiple of the ’minimum_io_size’ or +’optimal_io_size’ exposed in sysfs. minimum_io_size is the smallest +request the device can perform without incurring a read-modify-write +penalty (e.g. MD's chunk size). optimal_io_size is the device's +preferred unit of receiving I/O (e.g. MD's stripe width). minimum_io_size +is used if optimal_io_size is undefined (0). If both \fBmd_chunk_alignment\fP +and \fBdata_alignment_detection\fP are enabled the result of +\fBdata_alignment_detection\fP is used. +.IP \fBdata_alignment\fP \(em Default alignment (in KB) of start of data area when creating a new Physical Volume using the \fBlvm2\fP format. If a Physical Volume is placed directly upon an md device and -\fBmd_chunk_alignment\fP is enabled this parameter is ignored. -Set to 0 to use the default alignment of 64KB or the page size, if larger. +\fBmd_chunk_alignment\fP or \fBdata_alignment_detection\fP is enabled +this parameter is ignored. Set to 0 to use the default alignment of +64KB or the page size, if larger. .IP \fBdata_alignment_offset_detection\fP \(em If set to 1, and your kernel provides topology information in sysfs for the Physical Volume, the |