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Tuning should not be done in general and Best practices should be followed. So get very much acquainted with this first : http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide Then if you must, this could soothe or sting : http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide So drive carefully. -r

Hi, I read some articles on solarisinternals.com like "ZFS_Evil_Tuning_Guide" on http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide . They clearly suggest to disable cache flush http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#FLUSH . It seems to be the only serious article on the net about t...

I have read the ZFS best practice guide located at http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide However I have questions whether we support using slices for data on the same disk as we use for ZFS boot. What issues does this create if we have a disk failure in a mirrored environment? Does anyone have examples of customers doing this in productio...

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 am wondering if there is a guideline on how to configure ZFS on a server with Oracle database? We are experiencing some slowness on writes to ZFS filesystem. It take about 530ms to write a 2k data. We are running Solaris 10 u5 127127-11 and the back-end storage is a RAID5 EMC EMX. This is a small database with about 18gb storage allocated. Is there a tunable parameters that we can apply to

In the ZFS Best Practises Guide here: http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide It says: ``Currently, pool performance can degrade when a pool is very full and file systems are updated frequently, such as on a busy mail server. Under these circumstances, keep pool space under 80% utilization to maintain pool perfo...

...g 2% of memory. Our block size is such that we are *not* using discovered_direct_io on the datafiles, so we should be hitting the vxfs cache a lot.. Background out of the way, I have some questions that I was hoping that the zfs guru''s out there could chime in on.. Is this a problem? solarisinternals.com ZFS Best Practices seems to indicate reducing the ARC in the presence of another filesystem is a good idea. In this scenario (boot on ZFS, everything else on VxFS) what would be a reasonable value to limit the ZFS ARC without impacting performance? Is ZFS swap cached in the ARC? I can'&...

Hello all. I am new...very new to opensolaris and I am having an issue and have no idea what is going wrong. So I have 5 drives in my machine. all 500gb. I installed open solaris on the first drive and rebooted. . Now what I want to do is ad a second drive so they are mirrored. How does one do this!!! I am getting no where and need some help. -- This message posted from opensolaris.org

...o used truss and saw the same ENOMEM error. I am on a 4Gb system with swap -l reporting > > swapfile dev swaplo blocks free > /dev/zvol/dsk/rpool/swap 181,1 8 4194296 4194296 > > and I was trying to follow the directions for increasing swap here: > http://www.solarisinternals.com/wiki/index.php/ZFS_Troubleshooting_Guide#Resizing_ZFS_Swap_and_Dump_Devices if I understand correctly, in your case the failure occurs when you try to increase swap size by means of ''zfs set volsize'' command ? CCing ZFS team. Thank you, Jan

Hi, I do have a disk array that is providing striped LUNs to my Solaris box. Hence I''d like to simply concat those LUNs without adding another layer of striping. Is this possibile with ZFS? As far as I understood, if I use zpool create myPool lun-1 lun-2 ... lun-n I will get a RAID0 striping where each data block is split across all "n" LUNs. If that''s

Whats the default size of the file system cache for Solaris 10 x86 and can it be tuned? I read various posts on the subject and its confusing.. -- This message posted from opensolaris.org

Hi, Is there a simple way of rolling back to a specific TXG of a volume to recover from such a situation? Many thanks, Przem -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20110627/9b1c5a85/attachment.html>

<http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#RAID-Z_Configuration_Requirements_and_Recommendations> says that the number of disks in a RAIDZ should be (N+P) with N = {2,4,8} and P = {1,2}. But if you go down the page just a little further to the thumper configuration examples, none of the 3 exam...

Hello all... I''m migrating a nfs server from linux to solaris, and all clients(linux) are using read/write block sizes of 8192. That was the better performance that i got, and it''s working pretty well (nfsv3). I want to use all the zfs'' advantages, and i know i can have a performance loss, so i want to know if there is a "recomendation" for bs on nfs/zfs, or

...ng tools to watch zfs storage servers. Is this possible to run dtrace script for example 10 seconds? (Of course it is, I just trying to figure out how). Right know it has to be stopped by "CTRL-C" I''m particulary interested in scripts like iscsiio.d, iscsiwho.d from http://www.solarisinternals.com/wiki/index.php/DTrace_Topics_iSCSI Thanks in advance, Roman Naumenko roman at frontline.ca -- This message posted from opensolaris.org

We have a 32 GB RAM server running about 14 zones. There are multiple databases, application servers, web servers, and ftp servers running in the various zones. I understand that using ZFS will increase kernel memory usage, however I am a bit concerned at this point. root at servername:~/zonecfg #mdb -k Loading modules: [ unix krtld genunix specfs dtrace uppc pcplusmp ufs md mpt ip indmux ptm

The big problem that I have with non-directio is that buffering delays program execution. When reading/writing files that are many times larger than RAM without directio, it is very apparent that system response drops through the floor- it can take several minutes for an ssh login to prompt for a password. This is true both for UFS and ZFS. Repeat the exercise with directio on UFS and there is no

Dear all, given a DVD drive and DAT Tape Drive, and using Solaris 10 U7 (5/09), how can we plan for a total backup of ZFS root disk and procedure to recover that? Previously using UFS, we just need to use boot from Solaris OS DVD media, also using ufsdump, ufsrestore and installboot. Anybody can point me on how to achieve the same thing when the whole system disk are busted? Thanks in

I''m new so opensolaris and very new to ZFS. In the past we have always used linux for our database backends. So now we are looking for a new database server to give us a big performance boost, and also the possibility for scalability. Our current database consists mainly of a huge table containing about 230 million records and a few (relatively) smaller tables (something like 13 million

While thinking about ZFS as the next generation filesystem without limits I am wondering if the real world is ready for this kind of incredible technology ... I''m actually speaking of hardware :) ZFS can handle a lot of devices. Once in the import bug (http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6761786) is fixed it should be able to handle a lot of disks. I want to