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+title = "configuring raids on freebsd"
+date = "2016-01-30T14:40:00+00:00"
+author = "Gibheer"
+draft = false
++++
+
+Some days ago, a disk in the old server failed. I replaced it with a new server having ECC memory. It also had a LSI raid controller, which I did not notice when ordering the system.
+
+The configuration of the raid through the raid internal interface was pretty hard and took a long time. I could have booted a linux and used MegaCLI, but from work I knew that I would have to invest approximately the same time to investigate the same commands.
+
+As I was trying to install FreeBSD, gpart had some problems using the created raids, so I investigated how I would configure the raid on FreeBSD and found [mfiutil](https://www.freebsd.org/cgi/man.cgi?query=mfiutil&apropos=0&sektion=8&manpath=FreeBSD+10.2-stable&arch=default&format=html).
+It is a wonderful tool and makes creating raid sets very easy, without even reading the man page.
+
+As an example, this is how listing the drives looks for my server
+
+```
+$ mfiutil show drives
+mfi0 Physical Drives:
+ 5 (  279G) ONLINE <SEAGATE ST3300657SS 0008 serial=6SJ48V0H> SAS E1:S0
+ 6 (  279G) ONLINE <SEAGATE ST3300657SS 0008 serial=6SJ5S96X> SAS E1:S1
+```
+
+To adjust or read the current cache policy is only one command
+
+```
+$ mfiutil show volumes
+mfi0 Volumes:
+  Id     Size    Level   Stripe  State   Cache   Name
+ mfid0 (  279G) RAID-0      64K OPTIMAL Writes
+ mfid1 (  279G) RAID-0      64K OPTIMAL Writes
+
+$ mfiutil cache mfid0
+mfi0 volume mfid0 cache settings:
+             I/O caching: writes
+           write caching: write-back
+write cache with bad BBU: disabled
+              read ahead: none
+       drive write cache: default
+Cache disabled due to dead battery or ongoing battery relearn
+
+$mfiutil cache mfid0 disable
+Disabling caching of I/O writes
+
+$ mfiutil cache mfid0
+mfi0 volume mfid0 cache settings:
+             I/O caching: disabled
+           write caching: write-back
+write cache with bad BBU: disabled
+              read ahead: none
+       drive write cache: default
+Cache disabled due to dead battery or ongoing battery relearn
+```
+
+If you have to work with a LSI controller next time, remember mfiutil. It is in the base system and needn't to be installed through ports.