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Full Discussion: optimizing disk performance
Special Forums Hardware Filesystems, Disks and Memory optimizing disk performance Post 22959 by Perderabo on Thursday 13th of June 2002 12:15:43 PM
Old 06-13-2002
Quote:
Originally posted by J.P

And yet another hard disk tip i got from another book. It claims I'll get slightly better performance if I split my linux installation on several disks since more disk heads are working on the operating system. True, or just another worthless statement?

Thanks again
/J.P
That is absolutely true. At some point you have so many drives on an i/o path that they must wait for each other. Until you reach that point, the more drives the better.

I'm not a linux expert. But on HP-UX, there are several ways to exploit more drives. One way is to just use raids. They are a collection of drives that look like one drive to the os. But also with individual drives, HP (under LVM) supports striping. This lets you distribute a logical disk over several physical disks. HP also supports disk mirroring. With mirrors, a write must go to 2 or more drives, so writes take longer. But a read can come from any drive so reads are quicker. Since you usually read much more often than you write, this is a performance win.

If you don't have stuff like this on linux, then you can still work at the application level. It's not enough to just have the drives, they must be involved with your i/o intensive work. You may be able to one file on one drive, another file on the next drive and so on.
 

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LEARN ABOUT SUSE

partx

PARTX(8)						      System Manager's Manual							  PARTX(8)

NAME

       partx - telling the kernel about presence and numbering of on-disk partitions.

SYNOPSIS

       partx [-a|-d|-l] [--type TYPE] [--nr M-N] [partition] disk

DESCRIPTION

       Given  a  block	device	(  disk  ) and a partition table type , try to parse the partition table, and list the contents. Optionally add or
       remove partitions.

       This is not an fdisk - adding and removing partitions is not a change of the disk, but just telling the kernel about presence and numbering
       of on-disk partitions.

OPTIONS

       -a     add specified partitions or read disk and add all partitions

       -d     delete specified or all partitions

       -l     list partitions. Note that the all numbers are in 512-byte sectors.

       --type TYPE
	      Specify the partition type -- dos, bsd, solaris, unixware or gpt.

       --nr M-N
	      Specify the range of partitions (e.g --nr 2-4).

SEE ALSO

       addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8)

AVAILABILITY

       The partx command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

								    11 Jan 2007 							  PARTX(8)
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