Hi, I have been struggling tuning performance for quite a while now
Just noticed this article http://longwhiteclouds.com/2016/03/06/default-io-size-change-in-linux-kernel/ But I am unable to change max_sectors_kb to 1024 uname -a Linux osd01.tor.medavail.net 4.16.3-1.el7.elrepo.x86_64 Anyone has any experince /suggestions regarding Linux IO scheduler customization in DELL PERC context ? What is the correlation between IO scheduler max_sectors_kb and strsz ? Any recommendations for tuning IP scheduler and PERC ? Example: My RAID0 drives have a stripesize of 512 while max_sectors_kb is 256 I cannot increase max_sectors_kb - should I create the virtual drives with a stripsize of 256 ? megacli -LDInfo -L2 -a0 Adapter 0 -- Virtual Drive Information: Virtual Drive: 2 (Target Id: 2) Name : RAID Level : Primary-0, Secondary-0, RAID Level Qualifier-0 Size : 558.375 GB Sector Size : 512 Parity Size : 0 State : Optimal Strip Size : 512 KB Number Of Drives : 1 Span Depth : 1 Default Cache Policy: WriteBack, ReadAdaptive, Cached, No Write Cache if Bad BBU Current Cache Policy: WriteBack, ReadAdaptive, Cached, No Write Cache if Bad BBU Default Access Policy: Read/Write Current Access Policy: Read/Write Disk Cache Policy : Disk's Default Encryption Type : None Default Power Savings Policy: Controller Defined Current Power Savings Policy: None Can spin up in 1 minute: Yes LD has drives that support T10 power conditions: Yes LD's IO profile supports MAX power savings with cached writes: No Bad Blocks Exist: No Is VD Cached: Yes Cache Cade Type : Read Only Exit Code: 0x00 [root@osd01 queue]# megacli -LDInfo -L0 -a0 Adapter 0 -- Virtual Drive Information: Virtual Drive: 0 (Target Id: 0) Name : RAID Level : Primary-0, Secondary-0, RAID Level Qualifier-0 Size : 372.0 GB Sector Size : 512 Parity Size : 0 State : Optimal Strip Size : 512 KB Number Of Drives : 1 Span Depth : 1 Default Cache Policy: WriteThrough, ReadAheadNone, Direct, Write Cache OK if Bad BBU Current Cache Policy: WriteThrough, ReadAheadNone, Direct, Write Cache OK if Bad BBU Default Access Policy: Read/Write Current Access Policy: Read/Write Disk Cache Policy : Disk's Default Encryption Type : None Default Power Savings Policy: Controller Defined Current Power Savings Policy: None Can spin up in 1 minute: No LD has drives that support T10 power conditions: No LD's IO profile supports MAX power savings with cached writes: No Bad Blocks Exist: No Is VD Cached: No
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