search for: mfu_ghost

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

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

...HE LIST: Anon: 2% 1198857 [ New Customer, First Cache Hit ] Most Recently Used: 2% 1435141 (mru) [ Return Customer ] Most Frequently Used: 95% 57293484 (mfu) [ Frequent Customer ] Most Recently Used Ghost: 0% 201 (mru_ghost) [ Return Customer Evicted, Now Back ] Most Frequently Used Ghost: 0% 1679 (mfu_ghost) [ Frequent Customer Evicted, Now Back ] CACHE HITS BY DATA TYPE: Demand Data: 91% 54885238 Prefetch Data: 0% 15730 Demand Metadata: 6% 3820665 Prefetch Metadata: 2% 1207729 CACHE MISSES BY DATA TYPE: Demand Data: 15% 5618 Prefetch Data: 63% 23581 Demand Metadata: 7% 2701 Prefetch Metadata: 13% 515...

...CACHE LIST: Anon: 24% 1342485 [ New Customer, First Cache Hit ] Most Recently Used: 7% 396106 (mru) [ Return Customer ] Most Frequently Used: 68% 3826139 (mfu) [ Frequent Customer ] Most Recently Used Ghost: 0% 16 (mru_ghost) [ Return Customer Evicted, Now Back ] Most Frequently Used Ghost: 0% 24 (mfu_ghost) [ Frequent Customer Evicted, Now Back ] CACHE HITS BY DATA TYPE: Demand Data: 50% 2833150 Prefetch Data: 0% 6806 Demand Metadata: 24% 1383720 Prefetch Metadata: 24% 1341094 CACHE MISSES BY DATA TYPE: Demand Data: 47% 31200 Prefetch Data: 33% 22326 Demand Metadata: 10% 6596 Prefetch Metadata: 8% 56...

...89 (mru) [ Return Customer ] Most Frequently Used: 86% 23429186 (mfu) [ Frequent Customer ] Most Recently Used Ghost: 17% 4657584 (mru_ghost) [ Return Customer Evicted, Now Back ] Most Frequently Used Ghost: 32% 8712009 (mfu_ghost) [ Frequent Customer Evicted, Now Back ] CACHE HITS BY DATA TYPE: Demand Data: 30% 8308866 Prefetch Data: 0% 0 Demand Metadata: 69% 18747609 Prefetch Metadata: 0% 0...

...49 (mru) [ Return Customer ] Most Frequently Used: 86% 21237285 (mfu) [ Frequent Customer ] Most Recently Used Ghost: 16% 4057965 (mru_ghost) [ Return Customer Evicted, Now Back ] Most Frequently Used Ghost: 31% 7837353 (mfu_ghost) [ Frequent Customer Evicted, Now Back ] CACHE HITS BY DATA TYPE: Demand Data: 31% 7793822 Prefetch Data: 0% 0 Demand Metadata: 68% 16863812 Prefetch Metadata: 0% 0...

...equently Used:? ? ???65%? > ? ? ? 475719362 (mfu)? ? ? > ? [ Frequent Customer ] > >? ? ? ? ???Most > Recently Used Ghost:? ? 2%? ? ? > ? 20785604 (mru_ghost)???[ Return > Customer Evicted, Now Back ] > >? ? ? ? ???Most > Frequently Used Ghost:? 1%? ? ? ? > 9920089 (mfu_ghost)? ? [ Frequent Customer > Evicted, Now Back ] > >? ? ? ???CACHE HITS BY > DATA TYPE: > >? ? ? ? ???Demand > Data:? ? ? ? ? ? ? ? > 22%? ? ? ? 158852935 > >? ? ? ? ???Prefetch > Data:? ? ? ? ? ? ? > 17%? ? ? ? 123009991 > >? ? ? ? ???Demand > Metadata:? ?...

...8087 (mru) [ Return Customer ] Most Frequently Used: 65% 475719362 (mfu) [ Frequent Customer ] Most Recently Used Ghost: 2% 20785604 (mru_ghost) [ Return Customer Evicted, Now Back ] Most Frequently Used Ghost: 1% 9920089 (mfu_ghost) [ Frequent Customer Evicted, Now Back ] CACHE HITS BY DATA TYPE: Demand Data: 22% 158852935 Prefetch Data: 17% 123009991 Demand Metadata: 60% 437438658 Prefetch Metadata: 0%...

Joseph Little wrote: > I''d love to "vote" to have this addressed, but apparently votes for > bugs are no available to outsiders. > > What''s limiting Stanford EE''s move to using ZFS entirely for our > snapshoting filesystems and multi-tier storage is the inability to > access .zfs directories and snapshots in particular on NFSv3 clients.

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

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

I was trying to simply test bandwidth that Solaris/ZFS (Nevada b63) can deliver from a drive, and doing this: dd if=(raw disk) of=/dev/null gives me around 80MB/s, while dd if=(file on ZFS) of=/dev/null gives me only 35MB/s!?. I am getting basically the same result whether it is single zfs drive, mirror or a stripe (I am testing with two Seagate 7200.10 320G drives hanging off the same interface