similar to: ZFS Performance as a function of Disk Slice

I''ve been looking into the performance impact of NCQ. Here''s what i found out: http://blogs.sun.com/erickustarz/entry/ncq_performance_analysis Curiously, there''s not too much performance data on NCQ available via a google search ... enjoy, eric

Hi, My xen guest stopped booting suddenly and giving me the below error message. Any idea what is going wrong here? DOM 0 boots OK though. ata5.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0 ata5.00: irq_stat 0x40000008 ata5.00: failed command: READ FPDMA QUEUED ata5.00: cmd 60/00:00:cd:ee:36/02:00:09:00:00/40 tag 0 ncq 262144 in res 51/40:72:5b:f0:36/d9:00:09:00:00/40 Emask

Hi, My xen guest stopped booting suddenly and giving me the below error message. Any idea what is going wrong here? DOM 0 boots OK though. ata5.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0 ata5.00: irq_stat 0x40000008 ata5.00: failed command: READ FPDMA QUEUED ata5.00: cmd 60/00:00:cd:ee:36/02:00:09:00:00/40 tag 0 ncq 262144 in res 51/40:72:5b:f0:36/d9:00:09:00:00/40 Emask

A little back story: I have a Norco DS-1220, a 12 bay SATA box, it is connected to eSATA (SiI3124) via PCI-X two drives are straight connections, then the other two ports go to 5x multipliers within the box. My needs/hopes for this was using 12 500GB drives and ZFS make a very large & simple data dump spot on my network for other servers to rsync to daily & use zfs snapshots for

I''ve been trying to install a 2.6.37-12 kernel from kernel-ppa on one of my Ubuntu machines without success. It keeps giving errors like this: [ 9.115544] ata9: exception Emask 0x0 SAct 0xf SErr 0x0 action 0x10 frozen [ 9.115550] ata9.00: failed command: READ FPDMA QUEUED [ 9.115556] ata9.00: cmd 60/04:00: d4:82:85/00:00:1f:00:00/40 tag 0 ncq 2048 in [ 9.115557]

fun example that shows NCQ lowers wait and %w, but doesn''t have much impact on final speed. [scrubbing, devs reordered for clarity] extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b sd2 454.7 0.0 47168.0 0.0 0.0 5.7 12.6 0 74 sd4 440.7 0.0 45825.9 0.0 0.0 5.5 12.4 0 78 sd6 445.7 0.0

The time has come to review the current Contributor and Core contributor grants for ZFS. Since all of the ZFS core contributors grants are set to expire on 02-24-2009 we need to renew the members that are still contributing at core contributor levels. We should also add some new members to both Contributor and Core contributor levels. First the current list of Core contributors: Bill

Here''s some exciting news! Chris Emura, the Filesystem Development Manager within Apple''s CoreOS organization is interested in porting ZFS to OS X. For more information, please e-mail him directly at cemura at apple.com. Speaking for the zfs team (at Sun), this is great news and we fully support the effort. my powerbook hungers for ZFS, eric This message posted from

I?d like to report the ZFS related crash/bug described below. How do I go about reporting the crash and what additional information is needed? I?m using my own very simple test app that creates numerous directories and files of randomly generated data. I have run the test app on two machines, both 64 bit. OpenSolaris crashes a few minutes after starting my test app. The crash has occurred on

Hi, as I have learned from the discussion about which SSD to use as ZIL drives, I stumbled across this article, that discusses short stroking for increasing IOPs on SAS and SATA drives: http://www.tomshardware.com/reviews/short-stroking-hdd,2157.html Now, I am wondering if using a mirror of such 15k SAS drives would be a good-enough fit for a ZIL on a zpool that is mainly used for file

Hi guys, we are proposing a customer a couple of X4500 (24 Tb) used as NAS (i.e. NFS server). Both server will contain the same files and should be accessed by different clients at the same time (i.e. they should be both active) So we need to guarantee that both x4500 contain the same files: We could simply copy the contents on both x4500 , which is an option because the "new

I''ve got 12Gb or so of db+web in a zone on a ZFS filesystem on a mirrored zpool. Noticed during some performance testing today that its i/o bound but using hardly any CPU, so I thought turning on compression would be a quick win. I know I''ll have to copy files for existing data to be compressed, so I was going to make a new filesystem, enable compression and rysnc everything in,

Hello all, After setting up a Solaris 10 machine with ZFS as the new NFS server, I''m stumped by some serious performance problems. Here are the (admittedly long) details (also noted at http://www.netmeister.org/blog/): The machine in question is a dual-amd64 box with 2GB RAM and two broadcom gigabit NICs. The OS is Solaris 10 6/06 and the filesystem consists of a single zpool stripe

Hi folks, Myself and a colleague are currently involved in a prototyping exercise to evaluate ZFS against our current filesystem. We are looking at the best way to arrange the disks in a 3510 storage array. We have been testing with the 12 disks on the 3510 exported as "nraid" logical devices. We then configured a single ZFS pool on top of this, using two raid-z arrays. We are getting

I''m building another 24-bay rackmount storage server, and I''m considering what drives to put in the bays. My chassis is a Supermicro SC846A, so the backplane supports SAS or SATA; my controllers are LSI3081E, again supporting SAS or SATA. Looking at drives, Seagate offers an enterprise (Constellation) 2TB 7200RPM drive in both SAS and SATA configurations; the SAS model offers

I have been searching this forum and just about every ZFS document i can find trying to find the answer to my questions. But i believe the answer i am looking for is not going to be documented and is probably best learned from experience. This is my first time playing around with open solaris and ZFS. I am in the midst of replacing my home based filed server. This server hosts all of my media

Hi, Out of pure curiosity, I was wondering, what would happen if one tries to use a regular 7200RPM (or 10K) drive as slog or L2ARC (or both)? I know these are designed with SSDs in mind, and I know it''s possible to use anything you want as cache. So would ZFS benefit from it? Would it be the same? Would it slow down? I guess it would slow things down, because it would be trying to

Hi all, i want to replace a bunch of Apple Xserves with Xraids and HFS+ (brr) by Sun x4200 with SAS-Jbods and ZFS. The application will be the Helios UB+ fileserver suite. I installed the latest Solaris 10 on a x4200 with 8gig of ram and two Sun SAS controllers, attached two sas-jbods with 8 SATA-HDDs each und created a zfs pool as a raid 10 by doing something like the following: [i]zpool create

Hi. I gave a talk about ZFS during EuroBSDCon 2007, and because it won the the best talk award and some find it funny, here it is: http://youtube.com/watch?v=o3TGM0T1CvE a bit better version is here: http://people.freebsd.org/~pjd/misc/zfs/zfs-man.swf BTW. Inspired by ZFS demos from OpenSolaris page I created few demos of ZFS on FreeBSD:

Hello All, I want to build a home file and media server now. After experiment with a Asus Board and running in unsolve problems I have bought this Supermicro Board X8SIA-F with Intel i3-560 and 8 GB Ram http://www.supermicro.com/products/motherboard/Xeon3000/3400/X8SIA.cfm?IPMI=Y also the LSI HBA SAS 9211-8i