All: Thanks for the invaluable resource that is this mailing list. I've learned quite a bit over the space of this month. I have the following configuration and question: -- SNIP -- == Linux version 2.6.18-164.2.1.el5 (mockbuild@xxxxxxxxxxxxxxxxxxxx) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Wed Sep 30 12:52:46 EDT 2009. CentOS 5.4 == Personalities : [raid10] [raid6] [raid5] [raid4] md1 : active raid5 sda2[0] sdb1[1] sdc1[2] sdd1[3] sde1[4] sdf1[5] 393230080 blocks level 5, 256k chunk, algorithm 2 [6/6] [UUUUUU] md2 : active raid5 sda4[0] sdb4[1] sdc3[2] sdd3[3] sde3[4] sdf4[5] 424034560 blocks level 5, 256k chunk, algorithm 2 [6/6] [UUUUUU] [===>.................] resync = 17.4% (14793792/84806912) finish=19.4min speed=60024K/sec md0 : active raid10 sdf2[5] sde2[4] sdd2[3] sdc2[2] sdb2[1] sda3[0] 235938048 blocks 256K chunks 2 near-copies [6/6] [UUUUUU] == [root@fatboy log]# mdadm --detail /dev/md0 /dev/md0: Version : 0.90 Creation Time : Sun Nov 1 11:24:00 2009 Raid Level : raid10 Array Size : 235938048 (225.01 GiB 241.60 GB) Used Dev Size : 78646016 (75.00 GiB 80.53 GB) Raid Devices : 6 Total Devices : 6 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Mon Nov 2 09:46:48 2009 State : clean Active Devices : 6 Working Devices : 6 Failed Devices : 0 Spare Devices : 0 Layout : near=2 Chunk Size : 256K UUID : 0d994fe1:d4b4be70:3fe15b01:0e4bd6cb Events : 0.4 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 8 18 1 active sync /dev/sdb2 2 8 34 2 active sync /dev/sdc2 3 8 50 3 active sync /dev/sdd2 4 8 66 4 active sync /dev/sde2 5 8 82 5 active sync /dev/sdf2 == [root@fatboy log]# mdadm --detail /dev/md1 /dev/md1: Version : 0.90 Creation Time : Sun Nov 1 11:28:46 2009 Raid Level : raid5 Array Size : 393230080 (375.01 GiB 402.67 GB) Used Dev Size : 78646016 (75.00 GiB 80.53 GB) Raid Devices : 6 Total Devices : 6 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Mon Nov 2 09:39:51 2009 State : clean Active Devices : 6 Working Devices : 6 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 256K UUID : f537dfcb:fe7bd1a9:68316ddd:10b55eed Events : 0.14 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 8 17 1 active sync /dev/sdb1 2 8 33 2 active sync /dev/sdc1 3 8 49 3 active sync /dev/sdd1 4 8 65 4 active sync /dev/sde1 5 8 81 5 active sync /dev/sdf1 == [root@fatboy log]# mdadm --detail /dev/md2 /dev/md2: Version : 0.90 Creation Time : Sun Nov 1 11:25:03 2009 Raid Level : raid5 Array Size : 424034560 (404.39 GiB 434.21 GB) Used Dev Size : 84806912 (80.88 GiB 86.84 GB) Raid Devices : 6 Total Devices : 6 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Mon Nov 2 08:10:46 2009 State : clean, resyncing Active Devices : 6 Working Devices : 6 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 256K Rebuild Status : 33% complete UUID : 0030789c:58c839d6:6529cdec:6347f0f3 Events : 0.64 Number Major Minor RaidDevice State 0 8 4 0 active sync /dev/sda4 1 8 20 1 active sync /dev/sdb4 2 8 35 2 active sync /dev/sdc3 3 8 51 3 active sync /dev/sdd3 4 8 67 4 active sync /dev/sde3 5 8 84 5 active sync /dev/sdf4 == -- END SNIP -- My question (please forgive the ignorance if it is showing -- I'm used to FreeBSD and Solaris) is this.. I am noticing that my MD0 (Raid10), MD1 (Raid5), MD2 (Raid 5) arrays "seem" to be resyncing at somewhat random intervals. Mind you, I have also noticed that the kernel has put a 'governor' on the resync process as to limit performance issues. Is this normal behavior? I've checked CRON thinking that the resync might be a scheduled occurance, as well as my /var/log/messages. The only indication in the SYSLOG are events like: -- SNIP -- Nov 2 09:15:42 fatboy dnsmasq[3648]: exiting on receipt of SIGTERM Nov 2 09:15:43 fatboy dnsmasq[6922]: started, version 2.45 cachesize 150 Nov 2 09:15:43 fatboy dnsmasq[6922]: compile time options: IPv6 GNU-getopt no-ISC-leasefile no-DBus no-I18N TFTP Nov 2 09:15:43 fatboy dnsmasq[6922]: using local addresses only for domain devotioconsulting.net Nov 2 09:15:43 fatboy dnsmasq[6922]: using nameserver 208.67.220.220#53 Nov 2 09:15:43 fatboy dnsmasq[6922]: using nameserver 208.67.222.222#53 Nov 2 09:15:43 fatboy dnsmasq[6922]: read /etc/hosts - 14 addresses Nov 2 09:21:04 fatboy kernel: md: syncing RAID array md1 Nov 2 09:21:04 fatboy kernel: md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. Nov 2 09:21:04 fatboy kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction. Nov 2 09:21:04 fatboy kernel: md: using 128k window, over a total of 78646016 blocks. Nov 2 09:21:04 fatboy kernel: md: delaying resync of md2 until md1 has finished resync (they share one or more physical units) Nov 2 09:39:51 fatboy kernel: md: md1: sync done. -- END SNIP .. which do not indicate any outward hardware reason (i.e. LMSensors, my UPS Monitoring daemon, etc) are not picking up any events to trigger the resync process. Is this normal? I would think it somewhat odd to have an array just 'resync' randomly. Please let me know if I am missing something. -- Jesse W. Wheeler Member-Owner Devotio Consulting, L.L.C. -- -- Jesse W. Wheeler mailto: jwwstpete@xxxxxxxxx Charlotte, North Carolina - U.S.A. == "I'm a white male, age 18 to 49. Everyone listens to me, no matter how dumb my suggestions are." --Homer Simpson "I really don't understand how bipartisanship is ever going to work when one of the parties is insane."-- John Cole "I defy the tyranny of precedent. I cannot afford the luxury of a closed mind. 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