I am having a RAID 10 with 6 Harddiscs in my server. I had set the default cache policy to write through. After setting up the OS, i came to know the I/O rates are too slow. I read in some forums that setting default cache policy to Write back will improve the performance. Please advice on this. Also please help me to change my default cache policy to Write back using MegaCli.
Please see the MegaCli LDinfo output here
root@proxmox1:/usr/src/MegaCli_All_OS/Linux/opt/MegaRAID/MegaCli# ./MegaCli64 -LDInfo -L0 -a0 Adapter 0 -- Virtual Drive Information: Virtual Drive: 0 (Target Id: 0) Name : RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0 Size : 1.633 TB Sector Size : 512 Mirror Data : 1.633 TB State : Optimal Strip Size : 1.0 MB Number Of Drives per span:2 Span Depth : 3 Default Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU Default Access Policy: Read/Write Current Access Policy: Read/Write Disk Cache Policy : Disabled Encryption Type : None Bad Blocks Exist: No Is VD Cached: No