similar to: Some performance questions with ZFS/NFS/DNLC at snv_48

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

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 All, Awhile back (Feb ''07) when we noticed ZFS was hogging all the memory on the system, y''all were kind enough to help us use the arc_max tunable to attempt to limit that usage to a hard value. Unfortunately, at the time a sticky problem was that the hard limit did not include DNLC entries generated by ZFS. I''ve been watching the list since then and trying to

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

Greetings, all. Does anyone have a good whitepaper or three on how ZFS uses memory and swap? I did some Googling, but found nothing that was useful. The reason I ask is that we have a small issue with some of our DBA''s. We have a server with 16GB of memory, and they are looking at moving over databases to it from a smaller system. The catch is that they are moving to 10g. Oracle

Hi all I ran a workload that reads & writes within 10 files each file is 256M, ie, (10 * 256M = 2.5GB total Dataset Size). I have set the ARC max size to 1 GB on etc/system file In the worse case, let us assume that the whole dataset is hot, meaning my workingset size= 2.5GB My SSD flash size = 8GB and being used for L2ARC No slog is used in the pool My File system record size = 8K ,

Hello. I have a Solaris 11/11 x86 box (which I migrated from SolEx 11/10 a couple of weeks ago). Without no obvious reason (at least for me), after an uptime of 1 to 2 days (observed 3 times now) Solaris sets arc_no_grow to 1 and then never sets it back to 0. ARC is being shrunk to less than 1 GB -- needless to say that performance is terrible. There is not much load on this system. Memory

Hello, I''m new to OpenSolaris and ZFS so my apologies if my questions are naive! I''ve got solaris express (b52) and a zfs mirror, but this command locks up my box within 5 seconds: % cmp first_4GB_file second_4GB_file It''s not just these two 4GB files, any serious work in the filesystem (but I suspect the larger the file the worse it gets) bring the box to its knees.

We seem to be having write issues with zfs, does anyone see anything in the following: bash-3.00# kstat -p -n arcstats zfs:0:arcstats:c 655251456 zfs:0:arcstats:c_max 5242011648 zfs:0:arcstats:c_min 655251456 zfs:0:arcstats:class misc zfs:0:arcstats:crtime 5699201.4918501 zfs:0:arcstats:data_size 331404288 zfs:0:arcstats:deleted 408216 zfs:0:arcstats:demand_data_hits

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

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

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

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

Hola everyone, Solving this issue would be a huge time saver for analyzing my thesis data, so I'll try to be as concise as possible and hope that someone can give me a hand. I am trying to run a function that I created, which works fine until I try to use it with the by function. That function is listed at the bottom (f3) just in case that might be the issue. Essentially I have compiled a

Greeting All I have create a pool that consists oh a hard disk and a ssd as a cache zpool create hdd c11t0d0p3 zpool add hdd cache c8t0d0p0 - cache device I ran an OLTP bench mark to emulate a DMBS One I ran the benchmark, the pool started create the database file on the ssd cache device ??????????? can any one explain why this happening ? is not L2ARC is used to absorb the evicted data

Dear all, A question on modelling proportional data in R. I have a test experiment that was designed in a particular way, and which I can analyse "by hand" to an extent. I am really struggling to get R to give me sensible results in modelling it "properly", so must be doing something wrong here. As background, I conduct a series of experiments and count the

Greetings. I'm trying to determine whether to use rpart or randomForest for a classification tree. Has anybody tested efficacy formally? I've run both and the confusion matrix for rf beats rpart. I've looking at the rf help page and am unable to figure out how to extract the tree. But more than that I'm looking for a more comprehensive user's guide for randomForest including

Hello, setting auth_cache_size to nonzero enables caching of authentication data. The cache hitrate may be logged by sending SIGUSR2 to dovecot/auth process. Is it possible that dovecot logs statistics on regular intervals ? ( like http://www.postfix.org/postconf.5.html#anvil_status_update_time ) Andreas -- Andreas Schulze Internetdienste | P532 DATEV eG 90329 N?rnberg | Telefon +49 911 319-0

Would someone "in the know" be willing to write up (preferably blog) definitive definitions/explanations of all the arcstats provided via kstat? I''m struggling with proper interpretation of certain values, namely "p", "memory_throttle_count", and the mru/mfu+ghost hit vs demand/prefetch hit counters. I think I''ve got it figured out, but

Hi, ok I know zfs-fuse is still incomplete and performance has not been considered, but still, before I''m going to use it for my /home I wanted a rough estimate. Another benchmark already asserted that zfs by itself, on Solaris, is a very fast beast (http://cmynhier.blogspot.com/2006/05/zfs-benchmarking.html), faster than ext3 on Linux and also faster than UFS. Interestingly UFS seems