Lately I had to deal with some HP raid controllers and I’ve gathered some notes on them. I’ll post them here so I won’t forget about them.<\/p>\n
First of all, don’t even think on using them without a battery pack. Seriously DON’T. The performance degradation is humongous. Without a battery pack the controllers were giving me 1\/20th of the results with a battery pack. If you want to quickly test them, try iozone<\/a> using the following options: Installing hpacucli is a also a must if you want to monitor or configure the controllers from within your OS. Be sure to add the repositories from HWraid<\/a> to your system and then issue: Below are some commands using hpacucli that I used. Cache Board Present: True What you must take notice here is the Accelerator Ratio, Drive Write Cache and Battery Pack Count. To modify Accelerator Ratio (read\/write): To enable Array Acceleration for one of your logical drives use: If you happen to face the following error while opening hpacucli, don’t worry. You don’t need to reboot your machine as I’ve seen in various blogs.<\/p>\n Error: Another instance of ACU is already running (possibly a service). Please What you need to do is delete the shared IPC that hpacucli left when it got killed for some reason. Then use ipcrm to remove the array with the semid you want: and try to start hpacucli again.<\/p>\n References: Lately I had to deal with some HP raid controllers and I’ve gathered some notes on them. I’ll post them here so I won’t forget about them. First of all, don’t even think on using them without a battery pack. Seriously DON’T. The performance degradation is humongous. Without a battery pack the controllers were giving […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ep_exclude_from_search":false,"footnotes":""},"categories":[3],"tags":[406,407,33,401,402,595,404,54,408,409,403,405],"class_list":["post-1228","post","type-post","status-publish","format-standard","hentry","category-linux","tag-accelerator-ratio","tag-cache-ratio","tag-debian","tag-hp","tag-hpacucli","tag-linux","tag-p410","tag-raid","tag-raid-controller","tag-storage","tag-sysadmin","tag-write-cache"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\tiozone -t4 -I<\/code><\/p>\naptitude install hpacucli<\/code> (you are using Debian, arent’ you?). That reminds me that I am using those repositories on so many systems I manage that I must send a donation to the people at hwraid to thank them.<\/p>\n
\n# Show everything about your raid controllers
\n# hpacucli controller all show config detail<\/code><\/p>\n
\n Cache Status: OK
\n Accelerator Ratio: 25% Read \/ 75% Write
\n Drive Write Cache: Enabled
\n Total Cache Size: 512 MB
\n Battery Pack Count: 1
\n Battery Status: OK
\n SATA NCQ Supported: True<\/p><\/blockquote>\n
\nif you have a battery pack installed but your Drive Write Cache is still shown as “Disabled”, you can enable it using the command:
\n# hpacucli controller slot=X modify dwc=enable<\/code>
\nYou’ll know what to put instead of “slot=X” from the output of the previous command (show config detail).<\/p>\n
\n# hpacucli controller slot=X modify cacheratio=25\/75<\/code><\/p>\n
\n # hpacucli controller slot=X logicaldrive Y modify aa=enable<\/code><\/p>\n
\n terminate the ACU application before running the ACU CLI. Press ENTER to
\n exit.<\/p><\/blockquote>\n
\nTo see all your ipcs:
\n
\n# ipcrm -s 32768<\/code><\/p>\n
\n1. http:\/\/www.datadisk.co.uk\/html_docs\/redhat\/hpacucli.htm<\/a>
\n2. http:\/\/people.freebsd.org\/~jcagle\/hpacucli-readme<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"