# echo 128 > /sys/block/sdX/queue/nr_requests When tuning your metadata servers, keep in mind that this is often not so much about throughput, but rather about latency and also some amount of fairness: There are probably also some interactive users on your cluster, who want to see the results of their ls and other commands in an acceptable time, so you should try to work on that.
Sep 01, 2020 · The Linux kernel read ahead kicks in when a file is read from beginning or when blocks are read sequentially, making it necessary to tune I/O scheduler parameters specifically for booting (which has a different workload characterization than normal applications).
Sequential block rewrite is reading data and then writing it, so it is essentially the reading and writing performance combined. In this case, 103900 with defaults and 136714 with the tweaks in place. Random seeks are how many random blocks bonnie can read, in this case 519 vs 404.
Blocks ext4 allocates storage space in units of "blocks". A block is a group of sectors between 1KiB and 64KiB, and the number of sectors must be an integral power of 2. Blocks are in turn grouped into larger units called block groups. Block size is specified at mkfs time and typically is 4KiB.
(Linux I/O scheduler queue size and MyISAM performance). nr_requests (RW): This controls how many requests may be allocated in the block layer for read or write requests. increasing the nr_requests of the queue to 512 helps the most. (http...
Oct 28, 2013 · Performance Tuning for Linux Software Raid ; Howto tunnel TCP connections over SSH ; Multi-Language WordPress with xili-language Plugin ; Using STDIN/STDOUT streaming with rar instead of gzip/bzip2 ; VT-d / IOMMU with intel haswell and Z87 chipset ; Categories. Hardware (2) PC (2) Software (20) Cisco (1) Linux (14) VMware (8) Wordpress (2) Meta ...
The internal queue size of some controllers (queue_depth) is larger than the I/O scheduler's nr_requests so that the I/O scheduler doesn't get much of a chance to properly order and merge the requests. Deadline or CFQ scheduler likes to have nr_requests to be set 2 times the value of queue_depth, which is the default for a given controller.
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由于对blktrace的好奇,来到了block层.通过阅读block层的代码,自己的几个错误认知被纠正,比如 一) 同步操作时,进程是在驱动中睡觉真实情况是:进程在文件系统睡觉 二) 对同一个数据块的 ... linux IO调度 On Sunday 25 May 2003 13:27, Andrew Morton wrote: there seems to be no problem, it survives a kernel compile. Only the patch for fs/buffer.c seems to be reverted, it was there in -mm8
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Aug 28, 2013 · I'm attempting to effect short-delay syncing. I'd like either blocks or files to be synced within a few seconds up to one minute, whereas something like rsnapshot on an hourly basis will have too much of a potential data delta. Anyone have brainy ideas on how to replicate one block device to...
- Linux 4.4.63 -- Kleber Sacilotto de Souza Wed, 17 May 2017 16:44:58 +0200 linux (4.4.0-78.99) xenial; urgency=low * linux: 4.4.0-78.99 -proposed tracker (LP: #1686645) * Please backport fix to reference leak in cgroup blkio throttle (LP: #1683976) - block: fix module reference leak on put_disk() call for cgroups throttle * UbuntuKVM guest ... # cat /sys/block/sda/queue/nr_requests 128 # echo 100000 > /sys/block/sda/queue/nr_requests Configuring the queue depth can only be done by root. At this point the IOPS performance should be published something like the following: 4K Random Read IOPS = X (queue depth = Z) 4K Random Write IOPS = Y (queue depth = Z)
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for BLOCK in /sys/block/emcpow* do echo "100000" > "$BLOCK"/queue/nr_requests echo "noop" > "$BLOCK"/queue/scheduler done
Bog BOS: Установка Linux CentOS 7.0 для служебного сервера (kickstart) Предварительно прочитайте несколько слов о RHEL 7 и CentOS 7. Устанавливал с загрузкой по PXE с использованием KVM, kickstart. The SPS for Linux Samba Recovery Kit provides fault resilient protection for Samba file and print shares on a Linux server existing in a heterogeneous network enabling a failure on the primary Samba server to be recovered on a designated backup server without significant lost time or human intervention.
Much more information is needed such as block maps, which files the database regularly uses, how large those files are, how they are laid out in the directory structure, etc. For a workload with lots of files and directories, inode64 will be better, but for a database with realtively few large files the locality that inode64 gives you may not ...
To do so I also passthrough the entire B120i (ran in AHCI mode) for Xpenology use only; that way the drives connected to B120i works just as a proper Synology drive without the layer of vmdk or use of RDM. Touch wood, if my Gen8 decide to not work, I can still unplug my drives and use Linux to read all data directly. Request that the peer compress packets that it sends, using the BSD-Compress scheme, with a maximum code size of nr bits, and agree to compress packets sent to the peer Enables the use of PPP multilink; this is an alias for the 'multilink' option. This option is currently only available under Linux.
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nr_requests If you have a latency-sensitive application, then you should consider lowering the value of nr_requests in your request queue and limiting the command queue depth on the storage to a...
Block device request method: my_request(struct request_queue *rq). get all requests in queue: while (req = elv_next_request(rq)). 7) Block layer generic_make_request : collects BIOs from filesystem (or from virtual block device) into requests and merges requests (plugging) to enhance performance...Dear all, The purpose of this email is twofold: - to share the results of the many tests I performed with a 3ware RAID card + RAID-5 + XFS, pushing for better file I/O, - and to initiate some brainstorming on what parameters can be tuned for getting a good performance out of this hardware under 2.6.* kernels.
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As the Linux Software RAID HOWTO says, the combination of chunk size and block size matters for your performance. For a RAID 1 array this doesn't matter since there is no chunk size to deal with. For a RAID 1 array this doesn't matter since there is no chunk size to deal with.
nr_requests on the LVM device cannot be changed. Also, the sysfs attribute queue/scheduler just shows none . On a physical device, it looks like noop deadline [cfq] . pinkeen writes "I've used Linux as my work & play OS for 5+ years. The one thing that constantly drives me mad is its IO scheduling. When I'm copying a large amount of data in the background, everything else slows down to a crawl while the CPU utilization stays at 1-2%.
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Use iptables and ipset to create a blacklist and block one or more IP addresses on Linux. Blocking IP addresses and subnets with ipset. Most system administrators will already be familiar with iptables. It is around for quite a while and is enabled by default within the Linux kernel.
Benchmark On 2950 (tunning at the kernel Level) the basic information of the system2950 basic info basic device configuration For the following tests, the basic configuration of the devices is: 2 devices: /dev/sdb and /dev/sdc, each is mapped to a perc6E(raid controller) hosted 2MD1000(2*15 SATA II disks), the raid configurations is as: raid50 (spanlength=15)stripesize=128KB ,read=readahead ... 在 Linux 系统中进程表项 是一个 task_struct 任务结构指针。 任务数据结构定义在头文件 include/linux/sched.h 中。 有些书上称其为 进程控制块 PCBProcess Control Block或进程描 floppy.c 程序中主要实现了对软盘数据块的读 / 写驱动函数主要 是 do_fd_request() 函数。 ll_rw_blk.c 中程序实...
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Subject: Re: [linux-lvm] how to set higher then 128 nr_requests on LV's Date : Mon, 14 May 2018 20:22:32 -0400 (EDT) No, if you'd like to keep the device active then there is no existing way to restacking a Dom device's queue_limits.
Paste in this text block within the config. # Use for PHP 5.x: LoadModule php5_module modules/libphp5.so AddHandler php5-script php Include conf/extra/php5_module.conf. Step Four—See your PHP Config and Add Programs to Startup After LAMP is completely installed, we can take a look...
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