glusterfs zfs

failures, such as ZFS file systems. In this case, let's not enable doublewrite.Adaptive Hash IndexHashing (hash) is a very fast way to find, in general, the time to find the complexity of O (1). Commonly used for join operations, such as Hash joins in SQL Server and Oracle (hash join). However, common databases such as SQL Server and Oracle do not support hash indexes. MySQL's heap storage engine has a default index type of hash, while the InnoDB sto

good way to back up online. A file system that supports snapshots can instantly create a consistent view of the content used to back up. File systems and devices that support snapshots include FreeBSD's file system, ZFS file system, gnu/linux Logical Volume Management (LVM), and many San system and file storage solutions, such as NetApp storage. LVM mode should not be used, look at, do not write.recovering from a backupHow the data is recovered dep

inherits persistentImportPersistentclassoutoffunds (Exception):PassclassAccount (persistent. Persistent):def __init__(self,name,start_balance=0): Self.name=name Self.balance=start_balancedef __str__(self):return "Account :%s, balance:%s"%(self.name,self.balance)def __repr__(self):return "Account :%s, balance:%s"%(self.name,self.balance)defDeposit (Self,amount):"""Save amount into balance"""self.balance+=AmountdefWithdraw (self,amount):"""Withdraw from Balance""" ifAmount >self.balance:Ra

Tags: solaris SSE development Rman HTTP database version write proc data file1.Build Library UseAdmin Managedusing policy managed occurs when the instance name of Node 1 is sid_2 in a RAC environment2. Some minor patches if you create a database without using custom, you will need to manually upgrade the data dictionary of the database after you create it.3.Data files are stored in separate file systems (using ZFS separate mount points in Solaris). D

corruption and repairBecause InnoDB has a partial write problemCrash occurs when a 16K page writes only part of the dataThe redo record is a logical operation, not a physical block, and cannot be recovered by redo log crash recoveryThe operating system block is the 4kb,innodb page is 16KB, then need 4 times io to write a full pageHow to troubleshoot partial write issuesDouble Write, Doublewrite2 x 1M space, 2M (both disk files and memory space)The page is written to Doublewrite in the first ord

Parallel Database for OLTP and OLAPJust ASurvey article on materials in parallel database products andTechnologies for OLTP/OLAP applications. It mainly covers majorCommercial/academic efforts on developing parallel DBMS to solve theEver growing large amount of relational data processing problem.Part I–parallel DBMSs1.1 Parallel Database for OLAP (SHARED-NOTHING/MPP)TeraData–teradata Home–teradata dbc/1012 Paper–NCR Teradata VS Oracle Exadata (Teradata ' s perspective)Vertica– Vertica Home, Have

use instant recovery and do not need to start a backup, you can safely skip Xlog and save some space (default mode).Use traditional methods to create a basic backupNow Pg_basebackup is the most common way to get an initial copy of a database server. This is not always the case. Traditionally, a different approach has been used to work as follows:• Call SELECT Pg_start_backup (' some label ');• Copy all data files to a remote server via rsync or any other method• Run SELECT pg_stop_backup ();The

If possible, it is best to use the log file system, EXT3,EXT4,XFS,ZFS or JFS. If you do not, the file system check may take a long time after the crash, and if the system is not important, the non-log file system may be better than the support transaction, for example, ext2 may work better than ext3, or you can use Tunefs to turn off ext3 logging. Hanging on time for some file systems is also a factor, for example, ReiserFS, on a large partition may t

also provides leading hardware products that you can use to build your own private infrastructure. In addition, Oracle infrastructure as a service capable of scalable capacity on demand can deliver on-premise Oracle Integrated systems, including Oracle Exadata database cloud Server, Oracle Exalogic Middleware Cloud Server, Oracle exalytics Business Intelligence Cloud Service and Sun ZFS storage devices-monthly-paid hardware and hardware support deplo

development)5.iso9660: Disc File system6.FAT:VFAT (FAT32)7.NTFS: (not supported by default, can be supported by tuning kernel parameters)8. Network File system: NFS, CIFS ...9. Cluster file system: GFS2, OCFS2 ...10. Distributed File System:Kernel level: CephUser space (Application level): MogileFS, Moosefs ...11.Unix file system: UFS, FFS, JFS, ZFS ....12. Pseudo-File system: Proc, SYS, TMPFS, hugepagefs ...is not a file system that manages disk dat

files and JARs from the URI as expected Local: -a URI St Arting with local:/are expected to exist as a local file on each worker node. This means, no network IO would be incurred, and works well for large files/jars that is pushed to each worker, or Sha Red via NFS, GlusterFS, etc. Note that JARs and files is copied to the working directory is sparkcontext on the executor nodes. This can use up a significant amount of space over time an

, where is my action movie finally stored?What you are considering is the problem of data positioning.There are two common ways to locate data: Recording. Record information such as "Data A: Location (a)", query records when accessing data, obtain a location, and then read. Calculation. When storing and data A, its storage location (a) is calculated instantly. It is more convenient to feel this way. The common calculation is a consistent hash (consistent hashing),

, consider the use of distributed file systems, such as Glusterfs, Moosefs and so on.Drbd+heartbeat+nfs Blog: http://lizhenliang.blog.51cto.com/7876557/1362539Layer Sixth: Database cachingUsing the cache technology, the hot data is cached in memory, if the requested data in the cache, it is returned directly, otherwise go to the database, and update the data to update to the cache system, improve read performance, reduce database pressure. The cache i

. The entire system becomes easier to combine, especially for systems that need to use open source software. System Administrators may be discouraged from installing and configuring MySQL, Memcached, MongoDB, Hadoop, GlusterFS, RabbitMQ, and Node. js, Nginx, and so on, and then encapsulate these software to provide a runtime platform for the service. However, these complex tasks can be completed by starting several containers: First encapsulating thes

engine (Google Compute engine, GCE). Unlike Emptydir, the content on PD is permanently saved, and when the pod is deleted, the PD is only unloaded (unmount), but it is not deleted. It is important to note that you need to create a permanent disk (PD) before you can use Gcepersistentdisk.(4) Awselasticblockstore: Similar to GCE, this type of Volume uses Amazon's Amazon Web Service (AWS) EBS Volume and can be mounted to the pod. It is important to note that you need to create an EBS volume before

Share used by Neutron the network and subnetsa Share can only belong to one Share NetworkSecurity Service (security services)User security Services ( LDAP , Active Directory , Kerberos , etc.)a Share can be associated with a maximum of one security serviceSnapshots (snapshot)Share a read-only copy of the file systemYou can create a shared file system service from a snapshotBackendShare Providers of servicesa Share must belong to a BackendDriver (drive) gpfs ,

File SystemNetwork Distributed File System Ceph-Distributed object storage and file systems DRBD-Distributed block device replication Leofs-unstructured objects/data storage and high availability, distributed, and ultimately consistent storage systems. GlusterFS-extensible, Network attached storage file system. Distributed, scalable, portable file system for the Hadoop framework, written by Hdfs-java Lustre-A p

,tokyotyrant※,mongodb※,cassandra※,redis※,couchdbStorage Related: Nfs※,moosefs (MFS) ※,hadoop※,glusterfs※,lustre,fastdfsVersion management: Svn※,git※Monitoring alarm: Nagios※,cacti※,zabbix※,munin,hyperic,mrtg,graphiteDomain Name resolution: bind※,powerdns,dnsmasq※Sync Software: Rsync※,inotify※,sersync※,drbd※,csync2,union,lsyncd,scp※Batch management: Ssh+rsync+sersync※,saltstack※,expect※,puppet※,ansible, CfengineVirtualization: Kvm※,xen※Cloud computing:

GlusterFS STRIPE-COALESCE Options Help information is as follows: Option:cluster.stripe-coalesceDefault Value:trueDescription:enable/disable coalesce mode to flatten striped files as stored on the server (i.e., eliminate holes caused B Y the traditional format). In the Glsuter 3.4 version, the default value is FalseIn the Gluster 3.6 version, the default value is changed to TrueThis option is valid for striped volumes, when

table through the kernel (this step is usually used for the first step after partitioning is completed)#partx-A/dev/device-N m:n the range of the specified partition#kpartx-A/dev/device-f:forceCentOS5: Using Partprobe#partprobe [/dev/device] 3. After the hard disk partition is over, the lowest level of hardware is ready for the operating system. Next is the format of the disk. (1) Linux file System Management Linux file system: ext2, Ext3, Ext4, XFS, Btrfs, ReiserFS, JFS, swap swap: Swap