similar to: ZFS ARC & DNLC Limitation

Has anyone else noticed a significant zfs performance deterioration when running recent opensolaris bits? My 32-bit / 768 MB Toshiba Tecra S1 notebook was able to do a full opensolaris release build in ~ 4 hours 45 minutes (gcc shadow compilation disabled; using an lzjb compressed zpool / zfs on a single notebook hdd p-ata drive). After upgrading to 2007-05-25 opensolaris release bits

Hello. We''re currently using a Sun Blade1000 (2x750MHz, 1G ram, 2x160MB/s mpt scsi buses, skge GigE network) as a NFS backend with ZFS for distribution of free software like Debian (cdimage.debian.org, ftp.se.debian.org) and have run into some performance issues. We are running SX snv_48 and have run with a raidz2 with 7x300G for a while now, just added another 7x300G raidz2 today but

Hello, Im about to migrate a 6Tb database from Veritas Volume Manager to ZFS, I want to set arc_max parameter so ZFS cant use all my system''s memory, but i dont know how much i should set, do you think 24Gb will be enough for a 6Tb database? obviously the more the better but i cant set too much memory. Have someone implemented succesfully something similar? We ran some test and the

> Bug ID: 6398177 > Synopsis: zfs: poor nightly build performance in 32-bit mode (high disk activity) Part of the problem appear to be these kmem_caches: # mdb -k ... > ::kmastat cache buf buf buf memory alloc alloc name size in use total in use succeed fail ------------------------- ------ ------ ------ ---------

Hi there. I just got a new Adaptec RAID 51645 controller in because the old (other type) was malfunctioning. It is paired with 16 Seagate 15k5 disks, of which two are used with hardware RAID 1 for OpenSolaris snv_98, and the rest is configured as striped mirrors as a zpool. I created a zfs filesystem on this pool with a blocksize of 8K. This server has 64GB of memory and will be running

Hi. I''m all set for doing performance comparsion between Solaris/ZFS and FreeBSD/ZFS. I spend last few weeks on FreeBSD/ZFS optimizations and I think I''m ready. The machine is 1xQuad-core DELL PowerEdge 1950, 2GB RAM, 15 x 74GB-FC-10K accesses via 2x2Gbit FC links. Unfortunately the links to disks are the bottleneck, so I''m going to use not more than 4 disks, probably.

I''m moving some data off an old machine to something reasonably new. Normally, the new machine performs better, but I have one case just now where the new system is terribly slow. Old machine - V880 (Solaris 8) with SVM raid-5: # ptime du -kds foo 15043722 foo real 6.955 user 0.964 sys 5.492 And now the new machine - T5140 (latest Solaris 10) with ZFS

Running an mmap-intensive workload on ZFS on a X4500, Solaris 10 11/06 (update 3). All file IO is mmap(file), read memory segment, unmap, close. Tweaked the arc size down via mdb to 1GB. I used that value because c_min was also 1GB, and I was not sure if c_max could be larger than c_min....Anyway, I set c_max to 1GB. After a workload run....: > arc::print -tad { . . . ffffffffc02e29e8

I gave the AMD64 version of 7.2 RC2 a spin and all installed as expected off the dvd INTEL S3200SHV MB, Core2Duo, 4G of RAM In the past it had been suggested that for zfs tuning, something like vm.kmem_size_max="1073741824" vm.kmem_size="1073741824" vfs.zfs.prefetch_disable=1 However doing a simple test with bonnie and dd, there does not seem to be very much difference in

Hello zfs question about memory. I heard zfs is very ram hungry. Service looking to run: - nginx - postgres - php-fpm - python I have a machine with two quad core cpus but only 4 G Memory I'm looking to buy more ram now. What would be the recommend amount of memory for zfs across 6 drives on this setup? Also can 9.1 now boot to zfs from the installer? (no tricks for post install) Thanks

Hi, could anyone give recommendations (or share experience) regarding using ZFS: - FreeBSD 7-Stable (amd64 with 8GB RAM) + special tuning necessary (apart from increasing kernel memory to 1 or more GB for ZFS) - Samba 3.2 + ACLs possible directly under ZFS? + recommended compile options? - NFS - email (imap) - jails (I have seen some problems exist with using snaphots within

Greeting All I am using Filebench benchmark in an "Interactive mode" to test ZFS performance with randomread wordload. My Filebench setting & run results are as follwos ------------------------------------------------------------------------------------------ filebench> set $filesize=5g filebench> set $dir=/hdd/fs32k filebench> set $iosize=32k filebench> set

Hi, Bug ID: 6775100 stat() performance on files on zfs should be improved was fixed in snv_119. I wanted to do a quick comparison between snv_117 and snv_122 on my workstation to see what kind of improvement there is. I wrote a small C program which does a stat() N times in a loop. This is of course a micro-benchmark. Additionally it doesn''t cover a case if doing stat() on not cached

Hi, My customer says: ------------------------------------ Application has NFS directories with millions of files in a directory, and this can''t changed. We are having issues with the EMC appliance and RPC timeouts on the NFS lookup. I am looking doing is moving one of the major NFS exports to as Sun 25k using VCS to cluster a ZFS RAIDZ that is then NFS exported. For performance I

ZFS works really stable on FreeBSD, but I''m biggest problem is how to control ZFS memory usage. I''ve no idea how to leash that beast. FreeBSD has a backpresure mechanism. I can register my function so it will be called when there are memory problems, which I do. I using it for ARC layer. Even with this in place under heavy load the kernel panics, because memory with KM_SLEEP

Hello, ZFS is behaving strange on a OSOL laptop, your thoughts are welcome. I am running OSOL on my laptop, currently b124 and i found that the performance of ZFS is not optimal in all situations. If i check the how much space the package cache for pkg(1) uses, it takes a bit longer on this host than on comparable machine to which i transferred all the data. user at host:/var/pkg$ time

We''re starting to grow our ZFS environment and really need to start standardizing our monitoring procedures. OS tools are great for spot troubleshooting and sar can be used for some trending, but we''d really like to tie this into an SNMP based system that can generate graphs for us (via RRD or other). Whether or not we do this via our standard enterprise monitoring tool or

Hi. Is there a waf to safely flush ARC cache (get most of ZFS memory back to system)? ps. not by export/import This message posted from opensolaris.org

Greeting All Can any one help me figure out the size of the ARC tail, i.e, the portion in ARC that l2_feed thread is reading from before pages are evicted from ARC. Is the size of this tail proportional to total ARC size ? L2ARC device size ? is tunable ?????? your feed back is highly appreciated -- Abdullah Al-Dahlawi PhD Candidate George Washington University Department. Of

Hi, I was wondering about the ARC and its interaction with the VM pagecache... When a file on a ZFS filesystem is mmaped, does the ARC cache get mapped to the process'' virtual memory? Or is there another copy? -Manoj