The following taken from : Microsoft SQL Server 2016 Nutanix Best Practices Drive configuration: For optimal performance several virtual disks should be used. Nutanix suggest eight disks per SQL Server virtual machine spread across 4 SCSI controllers as laid out below: Drive Controller Type Controller # OS LSI SAS 0 SQL Sever installation LSI SAS 0 Backup LSI SAS 0 SQL Datafiles 1 PVSCSI 1 SQL Datafiles 2 PVSCSI 1 TempDB Datafiles 1 PVSCSI 2 TempDB Datafiles 2 PVSCSI 2 TempDB Log Files PVSCSI 3 Database Log Files PVSCSI 3 Cluster size formatting of all drives as below: SQL Data and log files - 64KB NTFS OS and SQL Server installation - 4KB NTFS - Server Team ?? ...
Prior Oracle Database 12c, an ASM instance ran on every node in the cluster and ASM Cluster File System (ACFS) Service on a node connected to the local ASM instance running on the same host to fetch the required metadata. If the ASM instance on a node were to fail, then ACFS file systems could no longer be accessed on that node. With introduction of Flex ASM in Oracle 12c, hard dependency between ASM and its clients has been relaxed and only a smaller number of ASM instances need run on a subset of servers in a cluster. In such a scenario, in order to make ACFS services available on nodes without an ASM instance, a new instance type has been introduced by Flex ASM: the ASM-proxy instance which works on behalf of a real ASM instance. ASM Proxy instance fetches the metadata about ACFS volumes and file systems from an ASM instance and caches it. If ASM instance is not available locally, ASM proxy instance connects to other ASM instances over the network to fetch the me...
Before drop we should make sure atleast 3 redo group are there and dropping group should be in INACTIVE state. SQL> alter database drop logfile group 3; alter database drop logfile group 3 * ERROR at line 1: ORA-01624: log 3 needed for crash recovery of instance scvdev (thread 1) ORA-00312: online log 3 thread 1: '/oradata/scvdev/datafile/scvdev/redo03.log' So to make ACTIVE to INACTIVE execute system level checkpoint. SQL> ALTER SYSTEM CHECKPOINT GLOBAL; System altered. SQL> alter database drop logfile group 3; Database altered. SQL> alter database add logfile group 3 ('/redolog/scvdev/onlinelog1/redo03a.log','/redolog/scvdev/onlinelog2/redo03b.log') size 512m; Database altered. SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC ---------- ---------- ---------- ---------- ---------- ---------- --- STATUS FIRST_C...
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