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Change gmirror default balance algorithm from "split" to "load".

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"split" is very ineffective for devices with rotating media as HDDs.
To be effective, it needs that transfer time reduction due to block
splitting was bigger then access time increase due to non-sequential
access. For modern HDDs I was able to reproduce it only with read sizes
of 2MB and above, which is almost not applicable in real life.
"load" algorithm same time is more universal and effective now.

Reviewed by:	pjd
This commit is contained in:
Alexander Motin 2009-12-08 22:43:29 +00:00
parent 93eba8807c
commit 20cad71f00
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=200282
1 changed files with 1 additions and 1 deletions
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sbin/geom/class/mirror/geom_mirror.c
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@ -44,7 +44,7 @@ __FBSDID("$FreeBSD$");
uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_MIRROR_VERSION;
static char label_balance[] = "split", configure_balance[] = "none";
static char label_balance[] = "load", configure_balance[] = "none";
static intmax_t label_slice = 4096, configure_slice = -1;
static intmax_t insert_priority = 0, configure_priority = -1;