Configure multi-path replication in CentOS 6.3
1. Determine whether the system follows the multipath
rpm-qa|
grep
device-mapper-multipath
2. Reload the new HBA storage (this step is not required if it is not the HBA storage)
modprobe-rlpfc
modprobelpfc
3. Install multipath
yum
install
device-mapper-multipath
4. Check whether the multipath is correctly loaded. If not, run the following command or restart
problems orMisconfiguration, excessive I/O being requested by SQL Server, DataFiles NotOptimally placed on the disk, and fragmentation.I/O subsystem
The first thing to do is to examine the I/O subsystem. hardware errorsAre a common cause and you shoshould run diagnostics if you are at allSuspicious that this might be the case.
Two common reasons for poor I/O throughput on a San are out of dateFirmware, and insufficient queue length on the HBA. Be awa
Cisco UCS 62XX firmware upgrade for personal useBecause again to some blades, the new blade firmware different, the version is very new, some can be downgraded to the current use of 2.2.1b, some do not know why not down ...More fixed bug, compatible with Vmware6, so upgrade ...Main preparatory work:1, confirm that the machine is running well, there are no major errors;2, check your profile file, confirm their network card and HBA card how to go (I am
access; # Modifying the configuration file requires restarting the service. [email protected]_master ~]# sed-i "s| #listen_addresses = ' localhost ' |listen_addresses = ' * ' |g '/var /lib/pgsql/9.6/data/postgresql.conf3.Host authentication# after the 82nd line, "IPv4 local Connections" under the new allowed clients; # "Host" on behalf of the host type, the first "all" for the DB, the second "all" for the user, "172.29.3.67/32" on behalf of the client IP, "trust" on behalf of the authenticatio
===================================================================================-----------------------------------------------------------------------------------# 1.1 Calibrate_io Test-----------------------------------------------------------------------------------SELECT D.name,I.asynch_ioFrom V$datafile D,V$iostat_file IWHERE d.file# = I.file_noand i.filetype_name = ' Data File ';--enabled both direct I/O and asynchronous I/O where possible.ALTER SYSTEM SET Filesystemio_options=setall sc
:00.0[[email protected]:~] Ethtool-i VMNIC7DRIVER:BNX2XVERSION:1.78.80.V60.12FIRMWARE-VERSION:BC 7.8.55bus-info:0000:11:00.1Gets the type of driver currently used by the host bus adapter[Email protected]:~] esxcfg-scsidevs-avmhba0 lsi_mr3 link-n/a sas.500605b00cbce9e0 (0000: 07:00.0) LSI megaraid SAS Invader Controllervmhba32 iscsi_vmk online iqn.1998-01.com.vmware:594af84f-3e99-cb7d- F42F-E04F43072844-7704B070ISCSI Software Adapter------------------------------------------------View Radi Card D
amount to time or a error was returned for a SCSI request, the M ID level manages the error or retries the request. The mid level also manages higher-level recovery such as requesting an HBA (LLD) or SCSI device reset. The SCSI error and timeout handler is implemented in./linux/drivers/scsi/scsi_error.c.
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SCSI Lower Level
At the lowest level is a collection of drivers called the SCSI low-level drivers. These are the "specific drivers" inte
Oracle 11g RAC Production environment Deployment detailsTian Yi ([email protected])Basic planningEquipment selection1, server: Dell R620 two units. CPU 8 core, Memory 64g,600g 15000-turn SAS hard drive, dual power supply, HBA card piece, connect storage cable (connect HBA card and shared storage).2, Storage: Dell MD3200 one. Dual controller, 12 600G 15000-turn SAS hard drive. For maximum availability, the R
ubuntu16.04 can not connect the WiFi link for a period of time and can not be connected, from the online search confirmation of this one bug.Workaround:1.Get details of your PCI wireless card by runningsudo lshw -class networkThe following information is displayed:*-network description: Wireless interface RTL8723BE PCIe Wireless Network Adapter vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info
entire GPU is dedicated to that virtual machine. The VDGA is expensive to implement, but can reduce costs compared to a single high-end workstation. The number of virtual machines per host is limited by the number of PCIe x16 slots in that server. There are now server hardware with up to 4 PCIe x16 slots, and the rack also has space for high-end GPUs. Some blade server chassis hardware vendors also offer "
the driver. these to the kernel know what size address space the the card is AB Le to address. in the case of radeons, it's used for GPUs access to graphics buffers stored in system memory which AR e accessed via a gart (Graphics Address remapping Table) . AGP and the older on-chip gart mechanisms is limited to 3 2 bits. Newer on-chip gart mechanisms have larger address spaces. After DMA masks, we set up the MMIO aperture. PCI/PCIE/AGP devices is pro
support Third-party chip USB 3.0, which in the use of the Central Plains and third party effect is basically equivalent, need to install the driver alone.
The main difference is described above, if the price is similar to the proposal to choose H77 Bar.
The desktop Board chipset includes Z77 (us$48), H77 (us$43), Z75 (us$40), and B75 (us$37). The Q77 (us$44) and Q75 (us$40) chipsets will be launched in May.
Compared to the 6 series chipset, the 7 series will be able to support PCI Express 3.
Dell's new version of Alienware 13 is an example of what it claims to be the world's first 13-inch Vr-ready notebook.
The starting price for Alienware 13 is not high--at least for the brand--but 1200 dollars (about 8105 yuan). This cost allows you to get the Intel Core I5-6300HQ processor, NVIDIA GeForce GTX 1060 graphics, 8GB ddr4-2133 memory, 180GB m.2 SATA 6Gbps SSD, killer 802.11c Wi-Fi, Bluetooth 4.1 and Windows 10 64-bit systems.
The low-Alienware version uses a TN screen wi
The new MacBook has been in the market for a while, with its ultra-thin, new processors, stronger battery endurance and a new color palette that may be tempting for many consumers, if you've never been in touch with an Apple device or a MacBook before, before you're ready to buy a MacBook, Just take a little time to understand these 5 things.
Faster chips, still so quiet as a MacBook.
The MacBook uses the Intel M3,M5,M7 processor, and of course the difference is in the price. The 1
The new MacBook has been in the market for a while, with its ultra-thin, new processors, stronger battery endurance and a new color palette that may be tempting for many consumers, if you've never been in touch with an Apple device or a MacBook before, before you're ready to buy a MacBook, Just take a little time to understand these 5 things.
Faster chips, still so quiet as a MacBook.
The MacBook uses the Intel M3,M5,M7 processor, and of course the difference is in the price. The 1
used for Linux and flash memory interactions, which is like a layer of flash transfer. Drivers for other block devices and character devices do not map with how flash devices operate. Although USB memory cards and SD cards are flash devices, they do not use this driver because they are hidden behind the system's block device interface. This driver is used for general purpose flash drive drivers for new flash memory devices.Net-Network drivers provide network protocols like AppleTalk, TCP, and o
1, hardware layer-related optimization
1.1. CPU Related
In the server's BIOS setup, you can adjust the following configurations to maximize CPU performance or avoid classic NUMA issues:
(1), select Performance per Watt optimized (DAPC) mode, play CPU maximum performance, run DB This usually requires high computational services do not consider power-saving;(2), turn off C1E and C states and other options, the purpose is to enhance CPU efficiency;(3), Memory Frequency (Memory frequency) Select
scanning the hard disk surface to check if there is a bad way)
3, memory failure (through the motherboard BIOS in the error report and operating system errors to judge)
4, motherboard failure (using the replacement method to judge)
5. CPU failure (using substitution method)
6, the Board card failure (generally Scsi/raid card or other PCI devices may also cause system panic, can be used to determine the replacement method)
5. For other common malfunctions, the chassis led turns yellow and r
, the use of SSD or PCIe SSD devices, at least hundreds of times times or even tens of times the IOPS increase;2, the acquisition of the array card with the cache and the Bbu module, can significantly increase the IOPS (mainly refers to mechanical disk, SSD or PCIe SSD except. At the same time, the health of the cache and the Bbu module should be checked periodically to ensure that the data is not lost duri
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