similar to: How to flush ARC cache?

Hello zfs-code, http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/vdev_cache.c 72 * All i/os smaller than zfs_vdev_cache_max will be turned into 73 * 1<<zfs_vdev_cache_bshift byte reads by the vdev_cache (aka software 74 * track buffer). At most zfs_vdev_cache_size bytes will be kept in each 75 * vdev''s vdev_cache. While it

> 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 ------------------------- ------ ------ ------ ---------

Has the ARC cache in Solaris 10 u8 been improved? Have been reading some mixed messages. Also should this parameter be tuned? Thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100114/e98e161f/attachment.html>

I have a semi-theoretical question about the following code in arc.c, arc_reclaim_needed() function: /* * take ''desfree'' extra pages, so we reclaim sooner, rather than later */ extra = desfree; /* * check that we''re out of range of the pageout scanner. It starts to * schedule paging if freemem is less than lotsfree and needfree. * lotsfree is the high-water mark

What is a use case of setting a reservation on the base pool object? Say I have a pool of 3 100GB drives dynamic striped (pool size of 300GB), and I set the reservation to 200GB. I don''t see any commands that let me ever reduce a pool''s size, so how is the 200GB reservation used? Related question: is there a plan in the future to allow me to replace the 3 100GB drives with 2

Greetings Gentlemen, I''m currently testing a new setup for a ZFS based storage system with dedup enabled. The system is setup on OI 148, which seems quite stable w/ dedup enabled (compared to the OpenSolaris snv_136 build I used before). One issue I ran into, however, is quite baffling: With iozone set to 32 threads, ZFS''s ARC seems to consume all available memory, making

Hi, I have been seeing data corruption on the ZFS filesystem. Here are some details. The machine is running s10 on X86 platform with a single 160Gb SATA disk. (root on s0 and zfs on s7) ...Sanjaya --------- /etc/release ---------- -bash-3.00# cat /etc/release Solaris 10 6/06 s10x_u2wos_09a X86 Copyright 2006 Sun Microsystems, Inc. All Rights

One thing I''ve been confused about for a long time is the relationship between ZFS, the ARC, and the page cache. We have an application that''s a quasi-database. It reads files by mmap()ing them. (writes are done via write()). We''re talking 100TB of data in files that are 100k->50G in size (the files have headers to tell the app what segment to map, so mapped chunks

If anyone is running this configuration, I have some questions for you about Page83 data errors. This message posted from opensolaris.org

I would appreciate if somebody can clarify a few points. I am doing some random WRITES (100% writes, 100% random) testing and observe that ARC grows way beyond the "hard" limit during the test. The hard limit is set 512 MB via /etc/system and I see the size going up to 1 GB - how come is it happening? mdb''s ::memstat reports 1.5 GB used - does this include ARC as well or is

How can I set up a ZVOL that''s accessible by non-root users, too? The intent is to use sparse ZVOLs as raw disks in virtualization (reducing overhead compared to file-based virtual volumes). Thanks, -mg 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

Was wondering if anyone of you see any issues with the 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

I?m trying to understand the inner workings of the adaptive replacement cache (arc). I see there are arc_bufs and arc_buf_hdrs. Each arc_buf_hdr points to an arc_buf_t. The arc_buf_t is really one entry in a list of arc_buf_t entries. The multiple entries are accessed through the arc_buf_t?s b_next member. Why does the arc_buf_hdr point to a list of arc_buf_ts and not just one arc_buf_t, i.e.,

I have a test 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

hi all, i''ve been using a SAN LUN as the sole member of a zpool with one additional zfs filesystem. this is a flat SAN fabric, so this LUN was available to other systems on the fabric, and one of them came up with "wrong magic number" for several drives, and, as best i can tell, the vtoc for my zpool LUN was over-written on that host via format labeling to correct the error.

Hello zfs-discuss, I wonder if ZFS will be able to take any advantage of Niagara''s built-in crypto? -- Best regards, Robert Milkowski mailto:rmilkowski at task.gda.pl http://milek.blogspot.com

Hello zfs-discuss, Just to be sure - if I create ZFS filesystems on snv_39 and then later I would want just to import that pool on S10U2 - can I safely assume it will just work (I mean nothing new to on-disk format was added or changed in last few snv releases which is not going to be in u2)? I want to put right now (I have to do it now) some data on ZFS and later I want to

Hello zfs-discuss, http://milek.blogspot.com/2007/04/hw-raid-vs-zfs-software-raid-part-iii.html -- Best regards, Robert Milkowski mailto:rmilkowski at task.gda.pl http://milek.blogspot.com

Hello zfs-discuss, What would you rather propose for ZFS+ORACLE - zvols or just files from the performance standpoint? -- Best regards, Robert mailto:rmilkowski at task.gda.pl http://milek.blogspot.com