search for: arcstat

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 4316945 zfs:0:arcstat...

Hi ZFSers, I''ve been working on merging the Joyent arcstat enhancements with some of my own and am now to the point where it is time to broaden the requirements gathering. The result is to be merged into the illumos tree. arcstat is a perl script to show the value of ARC kstats as they change over time. This is similar to the ideas behind mpstat, iostat,...

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 I''d really like expert clarificatio...

...----- -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Also, a FULL Kstat ZFS for 5 minutes Interval module: zfs instance: 0 name: arcstats class: misc c 1073741824 c_max 1073741824 c_min 134217728 crtime 28.083178473 data_size 39272960 deleted...

I wrote a simple tool to print out the ARC statistics exported via kstat. Details at http://blogs.sun.com/realneel/entry/zfs_arc_statistics -neel -- --- Neelakanth Nadgir PAE Performance And Availability Eng

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

I appear to be seeing the performance of a local ZFS file system degrading over a short period of time. My system configuration: 32 bit Athlon 1800+ CPU 1 Gbyte of RAM Solaris 10 U6 SunOS filer 5.10 Generic_137138-09 i86pc i386 i86pc 2x250 GByte Western Digital WD2500JB IDE hard drives 1 zfs pool (striped with the two drives, 449 GBytes total) 1 hard drive has

..., Is there a way to tune the zfs prefetch on a per pool basis? I have a customer that is seeing slow performance on a pool the contains multiple tablespaces from an Oracle database, looking at the LUNs associated to that pool they are constantly at 80% - 100% busy. Looking at the output from arcstat for the miss % on data, prefetch and metadata we are getting around 5 - 10 % on data, 50 - 70 % on prefetch and 0% on metadata. I am thinking that the majority of the prefetch misses are due to the tablespace data files. The configuration of the system is as follows Sun Fire X4600 M2 8 x 2.3...

...12 0% Page cache 14958 58 1% Free (cachelist) 6849 26 1% Free (freelist) 399498 1560 39% Total 1027660 4014 Physical 1027659 4014 arcstat first run: Time read miss miss% dmis dm% pmis pm% mmis mm% arcsz c 21:02:31 279 19 7 11 4 7 30 11 10 439M 3G 21:12:31 190 60 31 52 28 8 97 60 32 734M 3G 21:22:31 225 58 25 57 25 0 94 58 2...

Hi, Please forgive me if my searching-fu has failed me in this case, but I''ve been unable to find any information on how people are going about monitoring and alerting regarding memory usage on Solaris hosts using ZFS. The problem is not that the ZFS ARC is using up the memory, but that the script Nagios is using to check memory usage simply sees, say 96% RAM used, and alerts. The

Hey all - Just a quick one... Is there any plan to update the mdb ::memstat dcmd to present ZFS buffers as part of the summary? At present, we get something like: > ::memstat Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel 28859 112 13% Anon 34230

...t Solaris machine with 8 GB of memory. When freshly booted, the ARC consumes 5 GB (and I would be happy to make it consume more) and file-level prefetching works great even when I hit the machine with a lot of simultaneous sequential reads. But overnight, the ARC has shrunk to 2 GB (as reported by arcstat.pl) and file-level prefetching is (as expected at that level) absolutely murdering the performance of simultaneous sequential reads. So: is there any way to find out what is consuming the memory and causing the ARC to shrink (and/or to reset its target size, since arcstat.pl reports reports that...

Hi all, I have exchanged my Dell R610 in favor of a Sun Fire 4170 M2 which has 32 GB RAM installed. I am running Sol11Expr on this host and I use it to primarily serve Netatalk AFP shares. From day one, I have noticed that the amount of free RAM decereased and along with that decrease the overall performance of ZFS decreased as well. Now, since I am still quite a Solaris newbie, I seem to

...k/stats.rr32k.out ------------------------------------------------------------------------------------------------ The output for the same workload is disappointing , notice that the throughput dropped from 1307.7 mb/s to 2.7 mb/s !!!!!!!!!!!!!!!!!!!!!!1 My ARC_max is 3G Here is a snapshot of my arcstat output in case of high throughput --- notice the 100% hits ratio arcsz,read,hits,Hit%,miss,miss%,dhit,dh%,dmis,dm%,phit,ph%,pmis,pm%,mhit,mh%,mmis,mm%,mfug,mrug, 1G, 31M, 31M, 99,111K, 0, 28M, 99, 99K, 0, 2M, 99, 12K, 0, 1M, 98, 13K, 1, 43, 43, 1G,147K,145K, 99, 1K, 0, 14K,...

Sep 21 08:57:54 belle fsck: /dev/ad4s1d: 1 DUP I=190 Sep 21 08:57:54 belle fsck: /dev/ad4s1d: UNEXPECTED SOFT UPDATE INCONSISTENCY; RUN fsck MANUALLY. Ok, so I ran fsck manually (even with -y), but yet it refuses to clear/fix whatever to the questions posed as fsck runs. What does this all mean? Thanks, -Clint -- This message has been scanned for viruses and dangerous content by MailScanner,

...one command line: /usr/benchmarks/iozone/iozone -R -e -s 1g -t 32 -M -r 16k -F [...] Primarycache property: NAME PROPERTY VALUE SOURCE somepool primarycache all local rpool/swap primarycache metadata local ./arcstat.pl (last few lines before the system locks up): Time read miss miss% dmis dm% pmis pm% mmis mm% arcsz c 15:56:34 121K 247 0 243 0 4 0 178 1 151M 402M 15:56:35 0 0 0 0 0 0 0 0 0 137M 402M 15:56:36 14K 25 0 25...

...rectory with about 15''000 files totalling to 200 GB (so the file system is 2/3 full). The tests are run within the same directory. Test 1: Random writes @ 4k to 1000 1MB files (1000 threads, 1 per file). First I observe that ARC size grows (momentarily) above 512 MB limit (via kstat and arcstat.pl). Q: It seems that zfs:zfs_arc_max is not really a hard limit? I tried setting primarycache to none, metadata and all. The I/O reported is similar in the NONE and METADATA case (17 MB/S) while when set to ALL, I/O is 3 - 4 time less (4-5 MB/S). Q: Any explanation would be useful. In this test...

So I have this dual 16-core Opteron Dell R715 with 128G of RAM attached to a SuperMicro disk enclosure with 45 2TB Toshiba SAS drives (via two LSI 9200 controllers and MPxIO) running OpenIndiana 151a4 and I''m occasionally seeing a storm of xcalls on one of the 32 VCPUs (>100000 xcalls a second). The machine is pretty much idle, only receiving a bunch of multicast video streams and

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

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