similar to: ext3 on zvols journal performance pathologies?

Hello, I was doing performance testing, validating zvol performance in particularly, and found that zvol write performance to be slow ~35-44MB/s at 1MB blocksize writes. I then tested the underlying zfs file system with the same test and got 121MB/s. Is there any way to fix this? I really would like to have compatible performance between the zfs filesystem and the zfs zvols. # first test is a

Hi All, I am running nevada 79 BFU''ed to 82. The machine is a Ultra 20 with 4GB memory. I have several Windows XP domU''s configured and registered. When ever I try to start the fourth domain I get an out of memory exception: Not enough memory is available, and dom0 cannot be shrunk any further Each of my domains only uses 256 so I thought there would be sufficient memory

Hello All, I am running NTFS over iSCSI on a ZFS ZVOL volume with compression=gzip-9 and blocksize=8K. The server is 2 core P4 3.0 Ghz with 5 GB of RAM. Whenever I start copying files from Windows onto the ZFS disk, after about 100-200 Mb been copied the server starts to experience freezes. I have iostat running, which freezes as well. Even pings on both of the network adapters are reporting

Hi, I am soliciting input from the ZFS engineers and/or ZFS users on an extension to "zfs list". Thanks in advance for your feedback. Quick Background: The pNFS project (http://opensolaris.org/os/project/nfsv41/) is adding a new DMU object set type which is used on the pNFS data server to store pNFS stripe DMU objects. A pNFS dataset gets created with the "zfs

I''m trying to add extra zvols to a Solaris10 DomU, sv_113 Dom0 I can use virsh attach-disk <name> <zvol> hdb --device phy to attach the zvol as c0d1. Replacing hdb by hdd gives me c1d1 but then that is it. Being able to attach several more zvols would be nice but even being able to get at c1d0 would be useful Am I missing something or can I only attach to hda/hdb/hdd?

Team, **Please respond to me and my coworker listed in the Cc, since neither one of us are on this alias** QUICK PROBLEM DESCRIPTION: Cu created a dataset which contains all the zvols for a particular zone. The zone is then given access to all the zvols in the dataset using a match statement in the zoneconfig (see long problem description for details). After the initial boot of the zone

We are looking into the possibility of adding a dedicated ZIL and/or L2ARC devices to our pool. We are looking into getting 4 ? 32GB Intel X25-E SSD drives. Would this be a good solution to slow write speeds? We are currently sharing out different slices of the pool to windows servers using comstar and fibrechannel. We are currently getting around 300MB/sec performance with 70-100% disk busy.

How can I set up a ZVOL that''s accessible by non-root users, too? The intent is to use sparse ZVOLs as raw disks in virtualization (reducing overhead compared to file-based virtual volumes). Thanks, -mg This message posted from opensolaris.org

The `lofiadm'' man page describes how to export a file as a block device and then use `mkfs -F pcfs'' to create a FAT filesystem on it. Can''t I do the same thing by first creating a zvol and then creating a FAT filesystem on it? Nothing I''ve tried seems to work. Isn''t the zvol just another block device? -- -Gary Mills- -Unix Group-

Can you use a different zvol for dump and swap rather than using the swap and dump zvol created by liveupgrade? Casper

Hi guys I'm trying to figure out how I can use probabilistic searching on a given field within a document; I've written to the list about this before, but haven't quite figured out what's required and, following a little research, I think I understand what I need to do but I'd like a clarification on this. o We have a database of a number of documents, with fields: title,

I''ve upgraded my system from ufs to zfs (root pool). By default, it creates a zvol for dump and swap. It''s a 4GB Ultra-45 and every late night/morning I run a job which takes around 2GB of memory. With a zvol swap, the system becomes unusable and the Sun Ray client often goes into "26B". So I removed the zvol swap and now I have a standard swap partition. The

Hello zfs-discuss, What would you rather propose for ZFS+ORACLE - zvols or just files from the performance standpoint? -- Best regards, Robert mailto:rmilkowski at task.gda.pl http://milek.blogspot.com

What does it mean for the reported value of a zvol volsize to be less than the product of used and compressratio? For example, # zfs get -p all home1/home1mm01 NAME PROPERTY VALUE SOURCE home1/home1mm01 type volume - home1/home1mm01 creation 1254440045 - home1/home1mm01 used 14902492672

A colleague just asked if zfs delegation worked with zvols too. Thought I''d give it a go and got myself in a mess (tank/linkfixer is the delegated dataset): root at non-global / # zfs create -V 500M tank/linkfixer/foo cannot create device links for ''tank/linkfixer/foo'': permission denied cannot create ''tank/linkfixer/foo'': permission denied Ok, so

Hi folks, (Long time no post...) Only starting to get into this one, so apologies if I''m light on detail, but... I have a shiny SSD I''m using to help make some VirtualBox stuff I''m doing go fast. I have a 240GB Intel 520 series jobbie. Nice. I chopped into a few slices - p0 (partition table), p1 128GB, p2 60gb. As part of my work, I have used it both as a RAW

I''m just wondering if anyone has tried this, and what the performance has been like. Scenario: I''ve got a bunch of v20z machines, with 2 disks. One has the OS on it, and the other is free. As these are disposable client machines, I''m not going to mirror the OS disk. I have a disk server with a striped mirror zpool, carved into a bunch of zvols, each exported via

Hey all - Time for my silly question of the day, and before I bust out vi and dtrace... If there a simple, existing way I can observe the read / write / IOPS on a per-zvol basis? If not, is there interest in having one? Cheers! Nathan.

I have a customer who has implemented the following layout: As you can see, he has mostly raidz zvols but has one raidz2 in the same zpool. What are the implications here? Is this a bad thing to do? Please elaborate. Thanks, Scott Gaspard Scott.J.Gaspard at Sun.COM > NAME STATE READ WRITE CKSUM > > chipool1 ONLINE 0 0 0 > >

Rick McNeal and I have been working on building support for sharing ZVOLs as iSCSI targets directly into ZFS. Below is the proposal I''ll be submitting to PSARC. Comments and suggestions are welcome. Adam ---8<--- iSCSI/ZFS Integration A. Overview The goal of this project is to couple ZFS with the iSCSI target in Solaris specifically to make it as easy to create and export ZVOLs