I need help from the Linux RAID pros. To make a very long story short; I have a 7 disk in a RAID 6 array. I put the drives to sleep after 7 minutes of inactivity. When I go to use this array the spin up time is causing applications to hang. Current spin up time is 50 seconds, but will be getting worse as I add drives. Here is the MUCH longer description including more specs (DingbatCA): http://forums.gentoo.org/viewtopic-p-7599010.html Any help would be greatly appreciated. I think this would make a great wiki article. More details bellow: root@nas:/data# smartctl -a /dev/sdd | grep Spin_Up 3 Spin_Up_Time 0x0027 150 137 021 Pre-fail Always - 9608 root@nas:/data# time (touch foo ; sync) real 0m49.004s user 0m0.000s sys 0m0.004s root@nas:/data# time (touch foo ; sync) real 0m50.647s user 0m0.000s sys 0m0.008s root@nas:/data# df -h /data Filesystem Size Used Avail Use% Mounted on /dev/md125 9.1T 3.8T 5.4T 42% /data root@nas:/data# mdadm -D /dev/md125 /dev/md125: Version : 1.2 Creation Time : Wed Jun 18 07:54:38 2014 Raid Level : raid6 Array Size : 9766909440 (9314.45 GiB 10001.32 GB) Used Dev Size : 1953381888 (1862.89 GiB 2000.26 GB) Raid Devices : 7 Total Devices : 7 Persistence : Superblock is persistent Update Time : Mon Aug 11 16:30:16 2014 State : clean Active Devices : 7 Working Devices : 7 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Name : nas:data (local to host nas) UUID : 74f9ce7a:df1c2698:c8ec7259:5fdb2618 Events : 1038642 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 3 8 49 2 active sync /dev/sdd1 4 8 65 3 active sync /dev/sde1 5 8 81 4 active sync /dev/sdf1 7 8 145 5 active sync /dev/sdj1 6 8 129 6 active sync /dev/sdi1 -- 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
