Hi all Is it possible somehow to have linux spin down idle disks in an MD raid as to use MD for a MAID (massive array of idle disks)? I tried to monitor an idle raid with blktrace, and it seems the array (and its members) is accessed every two seconds for some reason. The array used with for the testing is a idle, degraded raid-5. roy root@Mathsterk:~# blktrace -d /dev/md0 -o - | blkparse -i - 9,0 2 1 0.000000000 26793 A W 5368711168 + 8 <- (252,2) 0 9,0 2 2 0.000000879 26793 Q W 5368711168 + 8 [(null)] 9,0 1 3 0.020063084 372 C W 5368711168 [0] 9,0 2 3 0.020113389 26793 A WBS 0 + 0 <- (252,2) 0 9,0 2 4 0.020114118 26793 Q WBS [kworker/u:1] 9,0 0 1 1.999791074 6948 A WBS 0 + 0 <- (252,2) 0 9,0 0 2 1.999792301 6948 Q WBS [kworker/u:2] 9,0 0 3 2.000000284 6948 A W 5368711168 + 8 <- (252,2) 0 9,0 0 4 2.000001050 6948 Q W 5368711168 + 8 [kworker/u:2] 9,0 0 5 2.020065947 6948 A WBS 0 + 0 <- (252,2) 0 9,0 0 6 2.020066632 6948 Q WBS [kworker/u:2] 9,0 1 4 2.020018632 372 C W 5368711168 [0] 9,0 0 7 3.999790266 26793 A WBS 0 + 0 <- (252,2) 0 9,0 0 8 3.999791552 26793 Q WBS [kworker/u:1] 9,0 0 9 4.000000435 26793 A W 5368711168 + 8 <- (252,2) 0 9,0 0 10 4.000001135 26793 Q W 5368711168 + 8 [kworker/u:1] 9,0 0 11 4.020027371 26793 A WBS 0 + 0 <- (252,2) 0 9,0 0 12 4.020028051 26793 Q WBS [kworker/u:1] 9,0 1 5 4.019973885 372 C W 5368711168 [0] 9,0 0 13 5.999788009 6948 A WBS 0 + 0 <- (252,2) 0 9,0 0 14 5.999789265 6948 Q WBS [kworker/u:2] 9,0 0 15 5.999999943 6948 A W 5368711168 + 8 <- (252,2) 0 9,0 0 16 6.000000676 6948 Q W 5368711168 + 8 [kworker/u:2] 9,0 0 17 6.019936327 6948 A WBS 0 + 0 <- (252,2) 0 9,0 0 18 6.019937059 6948 Q WBS [kworker/u:2] 9,0 1 6 6.019883619 372 C W 5368711168 [0] 9,0 2 5 8.019890546 372 C W 5368711168 [0] 9,0 0 19 7.999785408 26793 A WBS 0 + 0 <- (252,2) 0 9,0 0 20 7.999786808 26793 Q WBS [kworker/u:1] 9,0 0 21 7.999997589 26793 A W 5368711168 + 8 <- (252,2) 0 9,0 0 22 7.999998282 26793 Q W 5368711168 + 8 [kworker/u:1] 9,0 0 23 8.019948314 26793 A WBS 0 + 0 <- (252,2) 0 9,0 0 24 8.019949033 26793 Q WBS [kworker/u:1] -- Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@xxxxxxxxxxxxx http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
