From c55db76321e55e718350b0081364e3f2e3f9350e Mon Sep 17 00:00:00 2001 From: Matthew Dillon Date: Thu, 25 Jun 2009 12:50:02 -0700 Subject: [PATCH] HAMMER UTILS - Add to the newfs_hammer documentation. --- sbin/newfs_hammer/newfs_hammer.8 | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/sbin/newfs_hammer/newfs_hammer.8 b/sbin/newfs_hammer/newfs_hammer.8 index 28fec85a4b..44e241c4da 100644 --- a/sbin/newfs_hammer/newfs_hammer.8 +++ b/sbin/newfs_hammer/newfs_hammer.8 @@ -76,7 +76,23 @@ labels .Pc , or in .Xr disklabel 5 -partitions which do not overlap the label area. +partitions which do not overlap the label area (have a starting sector +greater then 16). +.Pp +.Nm HAMMER +filesystems are designed for large storage systems, up to 1 Exabyte, and +will not operate efficiently on small storage systems. +The minimum recommended filesystem size is 50GB. +.Nm HAMMER +must reserve 500MB to 1GB of its storage for reblocking and UNDO. +In addition, HAMMER filesystems operating normally, with full history +retention and daily snapshots, do not immediately reclaim space when +files are deleted. A regular system maintainance cron job runs once +a day to handle reclamation. +.Pp +.Nm HAMMER +works best when the machine's normal workload would not otherwise fill +the filesystem up in the course of 60 days of operation. .Pp The options are as follows: .Bl -tag -width indent -- 2.11.4.GIT