Mark Post wrote:
On 11/26/2008 at 5:34 PM, "Eatherly, John D [EQ]" <[EMAIL PROTECTED]>
wrote:
I am not positive that it will work. But this is what was passed to us for
doing this.
Make Swap File Procedure and Activate:
1. There are three different types of swap files.
(a.) Swap space on a ramdisk.
(b.) Swap space on a partition.
(c.) Swap file.
2. It is recommended that we use (c.) Swap file. IBM RedBook "Linux
for S/390" chapter 10.3.4.3 has the procedure that I used.
Back when that book was written (2000) that would have been a good
recommendation. (By the way, for those of you that have the expurgated
version, the chapter would be 9.3.4.3.) That was before we had the ability to
create multiple partitions on DASD volumes, and real storage was even more
expensive than it is today. These days, having your paging going to a swap
file within a file system would be, as Rob likes to characterize it, good only
for slowing your Linux system down.
Current recommendations vary according to what hardware resources you have.
Best performance is gained by using VDISKs driven by the DIAG flavor of the
DASD driver in Linux. After that, xpram disks carved out of expandaed storage,
then CMS minidisks, or partitions on a full DASD volume. Swap files on a Linux
file system would be just about dead last in preference.
I would rank a dedicated partition on a system or data disk below a file
on same. The dedicated partition is the "preferred" way of
RedHat/Fedora, SUSE/OpenSUSE and Debian on desktop systems.
Those who remember "busiest partition on least busy disk" from OS/2 days
should understand.
If you can dedicate a disk of any kind, then fastest disk is better. If
(a.) above refers to a _Linux_ ramdisk then I don't see how it makes
sense. If it's a host ramdisk, then to Linux it's not a ramdisk but a
real disk.
--
Cheers
John
-- spambait
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