search for: zfs_arc_max

...#39;s stop working for a few seconds, except one disk at a time. When this cycle is finished, it looks normal again. This seems to be the flushing of the NVRAM cache. Should be solved by disabling the flush...So far so good... But I also need the memory for PostgreSQL to work, so I added: set zfs:zfs_arc_max=8589934592 to /etc/system and rebooted. Now redid my test, with terrible results.. sequential read is about 120 MB/sec. One disk should be able to handle that, 14 disks should do more than a GB/sec, and in my previous benchmark without the arc_max setting, they actually make these figures...(even...

...almost no writes (1.1 MB/s) - any ides what is being read? --- BEFORE TEST # ~/bin/arc_summary.pl System Memory: Physical RAM: 12270 MB Free Memory : 7108 MB LotsFree: 191 MB ZFS Tunables (/etc/system): set zfs:zfs_prefetch_disable = 1 set zfs:zfs_arc_max = 0x20000000 set zfs:zfs_arc_min = 0x10000000 ARC Size: Current Size: 136 MB (arcsize) Target Size (Adaptive): 512 MB (c) Min Size (Hard Limit): 256 MB (zfs_arc_min) Max Size (Hard Limit): 512 MB (zfs_arc_max) ... > ::memstat Pa...

...0 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 I observe for backend on average I/O i...

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

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, I read, and know, that ZFS + XEN are not works well together. (I''ve only 512MB for Dom0). How I can disable/off all ZFS stuff to have more usable memory to Dom0. Regards Maciej

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 have a xVm b75 server and use zfs for storage (zfs root mirror and a raid-z2 datapool.) I see everywhere that it is recommended to have a lot of memory on a zfs file server... but I also need to relinquish a lot of my memory to be used by the domUs. What would a good value for dom0_mem on a box with 4 gig of ram?

...5 days apart. The interesting thing is the "anonymous" memory shows 2GB, though the two major hogs of that memory (two MySQL instances) claim to be consuming about 6.2GB (checked via pmap). Also, it seems like the ARC keeps creeping the kernel memory over the 4GB limit I set for the ARC (zfs_arc_max). What I was also, curious about, is if ZFS affects the cachelist line, or if that is just for UFS. Thank you in advance! Best Regards, Jason 01/17/2007 02:28:50 GMT 2007 Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel...

...ing output? bash-3.00# ./arc_summary.pl System Memory: Physical RAM: 6023 MB Free Memory : 784 MB LotsFree: 90 MB ZFS Tunables (/etc/system): ARC Size: Current Size: 1159 MB (arcsize) Target Size (Adaptive): 2106 MB (c) Min Size (Hard Limit): 624 MB (zfs_arc_min) Max Size (Hard Limit): 4999 MB (zfs_arc_max) ARC Size Breakdown: Most Recently Used Cache Size: 49% 1034 MB (p) Most Frequently Used Cache Size: 50% 1072 MB (c-p) ARC Efficency: Cache Access Total: 59966414 Cache Hit Ratio: 99% 59929362 [Defined State for buffer] Cache Miss Ratio: 0% 37052 [Undefined State for Buffer] REAL Hit Ratio: 97% 5...

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

...he following in Solaris 10 u8 ZFS? System Memory: Physical RAM: 11042 MB Free Memory : 5250 MB LotsFree: 168 MB ZFS Tunables (/etc/system): ARC Size: Current Size: 4309 MB (arcsize) Target Size (Adaptive): 10018 MB (c) Min Size (Hard Limit): 1252 MB (zfs_arc_min) Max Size (Hard Limit): 10018 MB (zfs_arc_max) ARC Size Breakdown: Most Recently Used Cache Size: 49% 5008 MB (p) Most Frequently Used Cache Size: 50% 5009 MB (c-p) ARC Efficency: Cache Access Total: 5630506 Cache Hit Ratio: 98% 5564770 [Defined State for buffer] Cache Miss Ratio: 1% 65736 [Undefined State for Buffer] REAL Hit Ratio: 74% 422...

I have a xVm b75 server and use zfs for storage (zfs root mirror and a raid-z2 datapool.) I see everywhere that it is recommended to have a lot of memory on a zfs file server... but I also need to relinquish a lot of my memory to be used by the domUs. What would a good value for dom0_mem on a box with 4 gig of ram?

> http://blogs.sun.com/ptelles/entry/sun_xvm_hypervisor_ > part_i Hello, I can''t get this to work. My pc just reboots after "Syncing filesystem" when I try to boot into xVM Hypervisor. I have a clean install of OpenSolaris 2008.11. -- This message posted from opensolaris.org

...st). The system has 12G RAM. It does not matter whether a reasonably fast L2ARC is added to the pool. The only thing that seems to help is setting ''primarycache=metadata'' for the ZFS in question, which does not seem like a desirable configuration. I have also tried setting the zfs_arc_max property to 0x80000000 (2G) in /etc/system. This helps a little (it won''t lock up quite as quickly), but at some point, it will still eat up all memory it can get. IOzone command line: /usr/benchmarks/iozone/iozone -R -e -s 1g -t 32 -M -r 16k -F [...] Primarycache property: NAME...

...Assembled 18 December 2009 root@opensolaris:/tmp# ''xm top'' shows 200% utilitzation, while my xp machine is sitting idle. The xp domU task manager shows it is idle; it''s a fresh install of xp and the domU has 512M assigned to it (domU has 8G, zfs_arc_max is limited in /etc/system) ; no other domUs are set up on my dom0. I''ve tried --vcpus=2 and --vcpus=1 on different installs, no effect. I''ve rebooted my dom0 and the xp domU multiple times, and I still see the same behavior. I''ve created other domUs (non-windows os) on...

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

May be someone could point me to optimal xm configuration file setting for Dell Power Edge 2950,2G RAM,One Quad CPU 2.0Ghz I need to run SBS 2003 Windows Server as a guest. I already installed it,but it appears very slow.... I mean may be there are some special good practices for low RAM machines. Thanks a lot. -- This message posted from opensolaris.org

I have uploaded a current source drop from the qemu subversion repository, to the download area. Additionally, there is a new Kernel kqemu module that will allow a 32-bit guest to run on a 64-bit host. The current source base uses a different code generator from the orignial Dyngen one. The new one is called "TCG" for "The Code Generator" and is supposed to fix the

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