Re: [zfs-discuss] questions about the DDT and other things

2011-12-01 Thread Erik Trimble
On 12/1/2011 6:44 PM, Ragnar Sundblad wrote: Thanks for your answers! On 2 dec 2011, at 02:54, Erik Trimble wrote: On 12/1/2011 4:59 PM, Ragnar Sundblad wrote: I am sorry if these are dumb questions. If there are explanations available somewhere for those questions that I just haven't found,

Re: [zfs-discuss] questions about the DDT and other things

2011-12-01 Thread Daniel Carosone
On Fri, Dec 02, 2011 at 01:59:37AM +0100, Ragnar Sundblad wrote: > > I am sorry if these are dumb questions. If there are explanations > available somewhere for those questions that I just haven't found, please > let me know! :-) I'll give you a brief summary. > 1. It has been said that when the

Re: [zfs-discuss] questions about the DDT and other things

2011-12-01 Thread Ragnar Sundblad
Thanks for your answers! On 2 dec 2011, at 02:54, Erik Trimble wrote: > On 12/1/2011 4:59 PM, Ragnar Sundblad wrote: >> I am sorry if these are dumb questions. If there are explanations >> available somewhere for those questions that I just haven't found, please >> let me know! :-) >> >> 1. It

Re: [zfs-discuss] questions about the DDT and other things

2011-12-01 Thread Erik Trimble
On 12/1/2011 4:59 PM, Ragnar Sundblad wrote: I am sorry if these are dumb questions. If there are explanations available somewhere for those questions that I just haven't found, please let me know! :-) 1. It has been said that when the DDT entries, some 376 bytes or so, are rolled out on L2ARC,

[zfs-discuss] LSI 3GB HBA SAS Errors (and other misc)

2011-12-01 Thread Ryan Wehler
During the diagnostics of my SAN failure last week we thought we had seen a backplane failure due to high error counts with 'lsiutil'. However, even with a new backplane and ruling out failed cards (MPXIO or singular) or bad cables I'm still seeing my error count with LSIUTIL increment. I've g

[zfs-discuss] questions about the DDT and other things

2011-12-01 Thread Ragnar Sundblad
I am sorry if these are dumb questions. If there are explanations available somewhere for those questions that I just haven't found, please let me know! :-) 1. It has been said that when the DDT entries, some 376 bytes or so, are rolled out on L2ARC, there still is some 170 bytes in the ARC to re

Re: [zfs-discuss] ZFS not starting

2011-12-01 Thread Hung-Sheng Tsao (Lao Tsao 老曹) Ph.D.
FYI http://www.oracle.com/technetwork/articles/servers-storage-admin/o11-113-size-zfs-dedup-1354231.html never to late:-( On 12/1/2011 5:19 PM, Freddie Cash wrote: The system has 6GB of RAM and a 10GB swap partition. I added a 30GB swap file but this hasn't helped. ZFS doesn't use sw

Re: [zfs-discuss] ZFS not starting

2011-12-01 Thread Freddie Cash
> > The system has 6GB of RAM and a 10GB swap partition. I added a 30GB > swap file but this hasn't helped. > ZFS doesn't use swap for the ARC (it's wired aka unswappable memory). And ZFS uses the ARC for dedupe support. You will need to find a lot of extra RAM to stuff into that machine in orde

Re: [zfs-discuss] ZFS not starting

2011-12-01 Thread Garrett D'Amore
You have just learned the hard way that dedup is *highly* toxic if misused. If you have a backup of your data, then you should delete the *pool*. Trying to destroy the dataset (the zfs level filesystem) will probably never succeed unless you have it located on an SSD or you have an enormous am

[zfs-discuss] ZFS not starting

2011-12-01 Thread Gareth de Vaux
Hi guys, when ZFS starts it ends up hanging the system. We have a raidz over 5 x 2TB disks with 5 ZFS filesystems. (The root filesystem is on separate disks). # uname -a FreeBSD fortinbras.XXX 8.2-STABLE FreeBSD 8.2-STABLE #0: Wed Oct 19 09:20:04 SAST 2011 r...@storage.xxx:/usr/obj/usr/src/s