On Wed, 2020-11-18 at 11:54 +0000, Alexey Bashtanov wrote: > If it helps, here's the details of the hardware config. > The controller is AVAGO MegaRAID SAS 9361-4i, > the SSDs are INTEL SSDSC2KG960G8 (configured as a raid1). > Current scheduler used is deadline. > Currently XFS is mounted without nobarriers, but I'm going to set that when there's high load next time to see how it affects throughput. > > Properties of the array > VD6 Properties : > ============== > Strip Size = 256 KB > Number of Blocks = 1874329600 > VD has Emulated PD = Yes > Span Depth = 1 > Number of Drives Per Span = 2 > Write Cache(initial setting) = WriteBack > Disk Cache Policy = Disk's Default > Encryption = None > Data Protection = Disabled > Active Operations = None > Exposed to OS = Yes > Creation Date = 28-10-2020 > Creation Time = 05:17:16 PM > Emulation type = default > Cachebypass size = Cachebypass-64k > Cachebypass Mode = Cachebypass Intelligent > Is LD Ready for OS Requests = Yes > SCSI NAA Id = 600605b00af03650272c641ca30c3196 Why?? WAL buffers has the most recent information, so that would result in unnecessary delay and I/O. You'd have to hack the code, but I wonder what leads you to this interesting requirement. Yours, Laurenz Albe -- +43-670-6056265 CYBERTEC PostgreSQL International GmbH Gröhrmühlgasse 26, A-2700 Wiener Neustadt Web: https://www.cybertec-postgresql.com
