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em further after deployment we recommend provisioning a higher value than you think you ll need initially so that your workload doesn t encounter performance bottlenecks and then eventually reducing the provisioned performance to fit your workload caution to avoid performance bottlenecks we recommend testing with your actual workload or a simulation of it before you put it into production increase your disk s performance you can increase each hyperdisk balanced disk s performance up to a maximum of 160 000 iops and 2 400 mbps of throughput the size of your vm helps determine hyperdisk s maximum performance limits so if you want very high hyperdisk performance you might need to increase your vm s number of cores if your most demanding workloads need higher disk performance than a single hyperdisk balanced disk can provide you can use one of the following methods to stripe together multiple hyperdisk balanced disks upgrade to hyperdisk extreme use a different software redundant array of independent disks raid mechanism such as mdadm as you scale your mysql databases you can dynamically increase the capacity and performance of your disks without downtime this helps the performance of online analytical processing olap style workloads doing large complex joins which can t fit in ram and spill to disk in rare cases mysql workloads which require extremely low storage latency and can tolerate data loss can store their full dataset on local ssd you can also use the following hybrid solutions to improve read latency and limit reductions in durability mirror your dataset between a hyperdisk and a local ssd use a volume manager to configure local ssd as a cache for data stored on an underlying hyperdisk take advantage of additional hyperdisk features hyperdisk also gives you the following features which can augment or simplify on premises high availability and disaster recovery workflows synchronous and asynchronous replication instant snapshots clones snapshots backed up to cloud storage for more information about configuring these features with mysql for compute engine see the high availability section that follows on this page local ssds some compute engine machine families let you use local ssds instead of hyperdisk these aren t durable storage but mysql workloads often use them to store temporary tablespaces for information on using local ssds for scaling mysql databases see dynamic disk resizing which follows on this page additional compute engine features you can use the following compute engine features to help optimize your mysql deployment cloud monitoring to monitor your vm s performance and usage of infrastructure services use google cloud console on the vm instances page in the observability tab you can monitor performance related metrics like cpu and memory utilization networking bandwidth and provisioned performance of your instances similarly on the disks page in the observability tab you can monitor the throughput and iops of your disk volumes to customize the performance metrics that you see use cloud monitoring to build queries you can select the specific performance metrics that you want to view for your infrastructure services for mysql specific metrics compute engine offers a mysql workload plug in best practices for configuring your operating system use an appropriate file system google focuses on optimizing for linux s ext4 and xfs file systems however most file systems are appropriate for use with mysql turn off transparent huge pages thp in your base operating system configuration for steps to turn off thp see the thp documentation if you re using linux use the relatime and lazytime flags for file system mount configuration this reduces performance overheads associated with updating the atime mtime and ctime values on files when they re read modified or have their metadata changed best practices for configuring mysql we recommend that you use the following configuration settings for mysql use a recent version of mysql google focuses on optimizing for mysql version 8 0 and later versions increase the size of the buffer pool mysql uses its buffer pool to improve read performance by caching data in ram reducing disk accesses by default mysql s buffer pool size is 128mib which is too small for most practical use cases we recommend that you increase the size of innodb_buffer_pool_size to be larger than the size of the working set that your application accesses in the database this usually consists of the following steps measure or estimate the size of your working set on a running copy of your mysql instance choose a virtual machine vm size and shape with enough ram to fit that working set configure the size of the buffer pool on the vm to take up the majority of the available ram turn on the doublewrite buffer mysql has a doublewrite buffer that helps protect against torn writes a failure mode where a write that covers multiple blocks on disk might only be partially committed if a hardware or power failure occurs in the middle of the write to benefit from this protection turn on innodb_doublewrite note in some scenarios it s safe to turn off the doublewrite buffer for more information see turn off the mysql doublewrite buffer following on this page set the value of innodb_flush_log_at_trx_commit to 1 this ensures that write transactions are durable on disk when they re committed to reduce performance overhead specify a value for innodb_flush_method for mysql version 8 0 14 and later versions set the value of innodb_flush_method to o_direct_no_fsync which is optimal but only present in these versions for mysql versions earlier than 8 0 14 set the value of innodb_flush_method to o_direct in high availability replication scenarios set the value of the primary database instance s sync_binlog to 1 mysql uses its binary log to communicate changes from the primary database to the secondary database so this ensures that the binary logs are committed at transaction commit time with the lowest possible replication lag and recovery point objective rpo between the databases when using mysql on c series machine families turn on innodb_numa_interleave this ensures that mysql s buffer pool can take advantage of non uniform memory access numa policies when to turn off the doublewrite buffer mysql s doublewrite buffer which protects against torn writes has a performance overhead of up to 25 for mysql write transactions and can increase transaction latency google cloud hyperdisk offers built in torn write protection if you re using mysql to write directly to an ext4 file system running on hyperdisk then you can turn off the doublewrite buffer provided that you correctly configured your file system and intermediate software layers for hyperdisk s torn write protection to be effective you must configure the file system and other intermediate software layers between the database and the disk to avoid introducing torn writes above the disk layer the following list provides examples of configurations that can introduce torn writes above the hyperdisk layer running your mysql instance inside of containers including google kubernetes engine or self hosted kubernetes storing your mysql files on an xfs file system which doesn t support large enough block sizes in most linux kernel configurations storing your mysql files on a redundant array of independent disks raid configuration that causes disk striping including mdadm for linux or storage spaces and storage spaces direct for windows storing your mysql files on top of a volume manager including logical volume manager lvm for linux or storage spaces and storage spaces direct for windows storing your mysql files on hyperdisk with a local solid state drive ssd configured as a cache using lvmcache dm cache or bcache for linux or storage spaces for windows note if you only store the mysql temporary tablespace on local ssd there s no risk of introducing torn writes running your mysql instance inside of a vm using nested virtualization while you can set up the preceding configurations so that they don t introduce torn writes we don t recommend that you turn off the doublewrite buffer when using them because of the difficulty of validating that a given configuration is safe optional turn off the doublewrite buffer to turn off the doublewrite buffer complete the following steps on the ext4 file system you must enable the bigalloc feature and configure the file system s cluster size to 16kib or a larger power of 2 multiple of 16kib this ensures mysql s writes won t be broken up into separate ios by the file system before being issued to hyperdisk failing to raise the limit or using any value smaller than 16kib won t protect against torn writes as an example with 16kib cluster size this is configured at file system creation time mkfs ext4 o bigalloc c 16384 dev device name disable innodb_doublewrite and set innodb_flush_method to o_direct or o_direct_no_fsync depending on your version of mysql as described above configure high availability ha and a backup solution we strongly recommend that you protect all of your critical mysql workloads by configuring high availability ha and backup solutions for them for both ha and backup the following factors are most important your recovery time objective rto or how quickly you can recover from a failure your recovery point objective rpo or how close before the time of the failure you re able to restore the data from ha solutions generally target near zero rto and rpo but only protect against infrastructure failures backup solutions target longer rto and rpo windows but provide coverage for a larger set of failure scenarios such as the following accidental data deletion ransomware attacks natural disasters configure high availability ha ha features use storage and compute redundancy to ensure that your mysql database has reduced downtime in the event of a host failure or outage letting client applications access its data even when an instance or zone is unavailable mysql allows replication in the following modes asynchronous mode in asynchronous mode the primary acknowledges write transactions as soon as they re committed locally so if there s an outage on the primary then a small amount of recently written data might be lost during failover as the rpo is close to zero but not actually zero semisynchronous mode in semisynchronous mode the primary waits to acknowledge the transaction until a configurable number of replicas has acknowledged receipt of the transaction this greatly increases the chance that no data loss occurs during an unplanned failover as the rpo is effectively zero for both modes rto is determined by how quickly health checks do the following identify a failed instance trigger failover notify clients that the failover instance is now the primary by using the domain name system dns or another way of identifying the database server in either replication mode you must have a failover instance to replicate to you can locate that instance in any of the following places the same zone that the primary instance is located in a different zone within the region that the primary is located in a different region than the primary is located in to maintain high availability even during zonal outages we recommend the following configuration locate your primary and failover instances in different zones whether or not they re within the same region use asynchronous replication this is because if you re using semisynchronous replication locating your primary and failover instances in separate zones can cause high latency for write transaction commits if you require zero rpo use hyperdisk balanced high availability which lets you synchronously replicate a disk across two zones in the same region for details see google s guide on providing ha services using hyperdisk high availability when you configure hyperdisk balanced high availability we recommend integrating with stateful managed instance groups to diagnose instance health issues and automate recovery actions configure a backup and data resilience plan backup and data resilience plans help to prevent data loss during failures like accidental data deletion ransomware attacks and natural disasters you can also use them as cold storage for compliance and auditing requirements for mysql there are many backup methodologies to choose from some of which act at the database level and some of which act at the storage volume level as you select a methodology you should primarily consider your rto and rpo requirements back up at the database level for database level backups consider using the following options that mysql provides incremental backups based on binary logging which create logical data dumps these include the following mysqldump mysqlpump tools that manage the backup process for you such as mysql enterprise backup for more information about mysql s database level backup options see backup and recovery in the mysql documentation for any of these options you must have a secondary storage system to copy the backup data into we recommend the following tools cloud storage filestore google cloud netapp volumes use hyperdisk to snapshot and clone at the storage level for storage level backups we recommend using hyperdisk products to snapshot clone and otherwise capture a point in time view of your mysql database the rpo for this approach depends on how frequently you take snapshots of your database and the rto depends on which specific solution you use if fast recovery is important to you and you only require backup coverage within a zone we recommend that you use hyperdisk s instant snapshots instant snapshots capture data at a specific point in time incrementally and can rapidly restore the data to a new hyperdisk volume through disk cloning providing an rto of minutes they let you recover data when a disk s contents have been overwritten deleted or corrupted and are available locally in the same zone or region as the source disk for more information see about instant snapshots for disaster recovery scenarios in which data must be stored with higher redundancy than the original disk and in a separate location to make sure that a single disaster doesn t affect all replicas of the data we recommend that you use hyperdisk s archive and standard disk snapshots archive and standard disk snapshots create a copy of the data in the disk at a point in time and store it with high redundancy in an immutable format when you create multiple snapshots of a disk such as with a snapshot schedule hyperdisk only stores incremental changes archive and standard disk snapshots are a good fit if you can tolerate higher rto because the data copy from snapshot storage back into vm storage can mean that they take a longer time to restore for more information see create archive and standard disk snapshots hyperdisk s instant snapshots and its archive and standard snapshots are both crash consistent within a single disk thi...
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