There is little you can do to speed it up, assuming you have followed the guidelines above, about putting your parity drive and your fastest drives on the fastest ports. The array may be stopped if it doesn't recognize your new configuration. Kids, do not try this at home... Before running memory intensive programs, set cache_pressure to 200. Tom reports here that after this 'fix', "this is actually the best performance I've ever measured". For more information, see http://lime-technology.com/forum/index.php?topic=965.0. This forum can be viewed by all, but access to contribute must be requested. There is much confusion over this, even the term itself, as to whether we are referring to the overall parity speed (found in the syslog, measured in seconds), or referring to the reported speed at a particular moment, at a particular percentage point of the process. To understand why there is so much variance in your parity speed. You may not be able to see the improvement since there are other bottlenecks, and SATA at 1.5 Gbps is still a little faster than most individual drives can communicate, but that is no reason not to take them off. The cache_dirs command is commonly customized, for example like this: This will cache all files and folders down to 5 levels deep, and will use a scanning interval of 3 to 5 seconds. Jumbo Frames are Ethernet frames with more than 1500 bytes of payload (1500 bytes being the default).
Related threads: the first about directory caching, intro to vfs_cache_pressure, an intriguing tree walking solution, a reason for numerous drives spinning up after one large file copy, the ls-r thread, ask Linux gods why vfs_cache_pressure=0 does not guarantee staying cached, post about 45 second pruning timer on dentry cache, another tree walker tease!, instructions for both methods in go script, more ls-r discussion, more on cached directories, the latest on directory caching. It waits for 30 seconds before setting the read-ahead buffer. If you are running addons with a limited amount of RAM, set it higher (eg. As a general rule, for optimum performance the SATA ports on the motherboard should be filled before using those on adapter cards.
Add a Cache drive (with the Plus or Pro license only) to your User Shares for a major improvement in write speed. Of course, these assume that you have your unRAID system running correctly. For UnRAID v4 releases, please see the bottom of this post. Even a "find" of my /mnt/data hierarchy can run out of memory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e very careful, double and triple check that you do in fact have the correct drive in the correct slot. Selecting AHCI is best, but if unavailable, then select a native SATA mode, possibly Enhanced SATA.
What is the safe way to rearrange disk numbers, assignments, slots, etc? And now the cache_dirs script automatically handles the setting of vm.vfs_cache_pressure=10. You probably do not need to go that deep. It has been suggested to change them by increments of 128. You cannot improve the speed by adding a faster drive, and in fact it may slow it down a little more. [])). Many gigabit NICs support jumbo frames of 9000 bytes or more, but it's advisable to find the datasheet for your specific controller and determine exactly what MTU is supported. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. For more information, see http://lime-technology.com/forum/index.php?topic=1247. Once you are sure that all your drives are in the correct slots. --- (tip from JoeL). If we can 'trick' the kernel into keeping our directory entries in that memory cache, then any directory scan will find what it is looking for already in memory, and not need to access the physical disk to get it. There are two things that have to be done, in order to keep the directory entries cached: (may change ...).
Note: The following pair of lines are just an example. All filesystems can run into fragmentation and resulting performance problems when drives fill all the way up. Using /dev/md* as the argument to the blockdev command will do this automatically, as the shell expands the "*" to all of the existing devices. Using the example above, change 192.168.0.100 to the local IP of your unRAID server. User testing (starting with this post plus subsequent discussion and testing) has found that significantly higher numbers can provide significantly better performance, though results may vary greatly depending on your particular hardware. Who needs unnecessary handicaps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ddons 11,038,730 Downloads Last Updated: Sep 22, … If possible, ensure that your Parity drive is not sharing an IDE channel or the PCI bus or a Port Multiplier channel. The current speed displayed in the UnRAID Webgui is notoriously unreliable. The tips above are for making your server perform faster, the following tips are for making your server perform better. No talking heads or something lime that. Realtek chipsets are the least recommended (but the most common!).
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