08-31-2012
From what I've seen it has more to do with the app and sometimes the OS in question. Oracle on Solaris benefits decidedly from raw when there is a heavy I/O load on the LVM's for a large db.
It can introduce issues for things like restores. There is also the O_DIRECT flag in Linux, which bypasses the filesystem and does what raw does elsewhere. Assuming your apps can make use of it.
Here is a discussion:
Using Raw Device Partitions
This User Gave Thanks to jim mcnamara For This Post:
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---------- Post updated at 12:20 PM ---------- Previous update was at 10:11 AM ----------
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LEARN ABOUT OPENSOLARIS
diskscan
diskscan(1M) System Administration Commands diskscan(1M)
NAME
diskscan - perform surface analysis
SYNOPSIS
diskscan [-W] [-n] [-y] raw_device
DESCRIPTION
diskscan is used by the system administrator to perform surface analysis on a portion of a hard disk. The disk portion may be a raw parti-
tion or slice; it is identified using its raw device name. By default, the specified portion of the disk is read (non-destructive) and
errors reported on standard error. In addition, a progress report is printed on standard out. The list of bad blocks should be saved in a
file and later fed into addbadsec(1M), which will remap them.
OPTIONS
The following options are supported:
-n Causes diskscan to suppress linefeeds when printing progress information on standard out.
-W Causes diskscan to perform write and read surface analysis. This type of surface analysis is destructive and should be invoked with
caution.
-y Causes diskscan to suppress the warning regarding destruction of existing data that is issued when -W is used.
OPERANDS
The following operands are supported:
raw_device The address of the disk drive (see FILES).
FILES
The raw device should be /dev/rdsk/c?[t?]d?[ps]?. See disks(1M) for an explanation of SCSI and IDE device naming conventions.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Architecture |x86 |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
addbadsec(1M), disks(1M), fdisk(1M), fmthard(1M), format(1M), attributes(5)
NOTES
The format(1M) utility is available to format, label, analyze, and repair SCSI disks. This utility is included with the diskscan, addbad-
sec(1M), fdisk(1M), and fmthard(1M) commands available for x86. To format an IDE disk, use the DOS format utility; however, to label, ana-
lyze, or repair IDE disks on x86 systems, use the Solaris format(1M) utility.
SunOS 5.11 24 Feb 1998 diskscan(1M)