Virtual File System provider: This is on FreeBSD only and shows VFS and.
I haven’t heard whether a future ZFS patch might enable it there. 06 and will be supported in Solaris 10 Update 8 (supposedly shipping in Oct or Nov). L2ARC is supported in OpenSolaris 2009. L2ARC is not natively supported under Solaris 10 Update 6 or Update 7.
ZFS is a combined file system and logical volume manager designed by Sun Microsystems. The features of ZFS include protection against data corruption, support for.
I also had fun playing with transactions and JDBC connection pool probes, but that data wasn’t nearly as interesting as the SQL statement execution times listed above. I’m still not 100% sure what kind of performance impact these probes will have on an application, but will wait for the probes to be integrated into a mainsteam Java build prior to doing any real performance testing. If you are running openjdk on Solaris, and you want to get better visibility into your applications, JSDT may well be worth a look. Thanks Keith for answering my e-emails, and to team DTrace for creating the awesomeness that is DTrace.
Sort | uniq -c | sort
-n # List probes for a particular provider: dtrace -l -P syscall . The following library of DTrace one-liners were last tested on.
Hwpmc is one of our most powerful tools for measuring and understanding CPU performance on FreeBSD. Support for profiling of call graphs was an important missing piece that will simplify the ability of developers to analyze performance bottlenecks in the kernel and in application code.
DTrace uses providers to group probes, so the first thing I did was create a “postgresqljdbc ” provider that would be visible to DTrace through the JSDT framework. This was achieved by defining an interface that extended the com.
* : L2ARC : |-_____-| * : devices : | Disks | * +=========+ `-_____-‘ * * Read requests are satisfied from the following sources, in order: * * 1) ARC * 2) vdev cache of L2ARC devices * 3) L2ARC devices * 4) vdev cache of disks * 5) disks * * Some L2ARC device types exhibit extremely slow write performance. If the ARC evicts faster than the L2ARC can maintain a headroom, * then the L2ARC simply misses copying some buffers. The main role of this cache is to boost * the performance of random read workloads. If an ARC buffer is written (and dirtied) which also exists in the * L2ARC, the now stale L2ARC buffer is immediately dropped. Each * device is written to in a rotor fashion, sweeping writes through * available space then repeating. Writes to the L2ARC devices are grouped and sent in-sequence, so that * the vdev queue can aggregate them into larger and fewer writes. The thread that does this is * l2arc_feed_thread(), illustrated below; example sizes are included to * provide a better sense of ratio than this diagram: * * head –> tail * +———————+———-+ * ARC_mfu |:::::#:::::::::::::::|o#o###o###|–>. The intended L2ARC devices * include short-stroked disks, solid state disks, and other media with * substantially faster read latency than disk. C, which is also surrounded by the actual implementation code. It never needs to flush * write buffers back to disk based storage. It is * safe to say that this is an uncommon case, since buffers at the end of * the ARC lists have moved there due to inactivity. # already on L2ARC * +———————+———-+ | o L2ARC eligible * ARC_mru |:#:::::::::::::::::::|#o#ooo####|–>| : ARC buffer * +———————+———-+ | * 15. There is no eviction path from the ARC to the L2ARC. The L2ARC does not store dirty content. This also helps prevent * the potential for the L2ARC to churn if it attempts to cache content too * quickly, such as during backups of the entire pool. * * The performance of the L2ARC can be tweaked by a number of tunables, which * may be necessary for different workloads: * * l2arc_write_max max write bytes per interval * l2arc_write_boost extra write bytes during device warmup * l2arc_noprefetch skip caching prefetched buffers * l2arc_headroom number of max device writes to precache * l2arc_feed_secs seconds between L2ARC writing * * Tunables may be removed or added as future performance improvements are * integrated, and also may become zpool properties. | * +==============================+ * 32 Gbytes * * 3. 9 Gbytes ^ 32 Mbytes | * headroom | * l2arc_feed_thread() * | * l2arc write hand
Глава 4, Репликация обучает тому, как реплицировать наборы данных ZFS на другие машины. Репликации могут позволить вам подхватывать массивные объёмы данных и перемещать их поперёк страны или вокруг планеты, сохраняя при этом их актуальность, даже без уведомления пользователей.
Хотя она и имеет конкурентов, например B-Tree файловую систему (BTRFS), этим конкурентам предстоит ещё много чего сделать. А ZFS несётся тем временем вперёд каждый день. ZFS содержит более 100 “лет конструирования” усилий ряда лучших умов в этой индустрии.
Large network repositories of thousands of software packages make Fedora and Ubuntu the great, easy to use Linux distributions that they are. Extending the amount of packages available to OpenSolaris just builds upon this usability. I’m really glad to see the OpenSolaris IPS repositories growing with the amount of available packages.
New submitter Liberum Vir writes “Many of the people that I talk with who use Solaris-like systems mention ZFS and DTrace as the reasons they simply cannot move to Linux.