v slow raid resync
OK todays problem.
I have a HP N54L Microserver running centos 6.5. In this box I have a 3x2TB disk raid 5 array, which I am in the process of extending to a 4x2TB raid 5 array. I've added the new disk --> mdadm --add /dev/md0 /dev/sdb And grown the array --> mdadm --grow /dev/md0 --raid-devices=4 Now the problem the resync speed is v slow, it refuses to rise above 5MB, in general it sits at 4M. from looking at glances it would appear that writing to the new disk is the bottle neck, /dev/sdb is the new disk. Disk I/O In/s Out/s md0 0 0 sda1 0 0 sda2 0 1K sdb1 3.92M 0 sdc1 24.2M 54.7M sdd1 11.2M 54.7M sde1 16.3M 54.7M I partitiioned the disk with --> parted -a optimal /dev/sdb [root@nas ~]# parted -a optimal /dev/sdb GNU Parted 2.1 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: ATA ST2000DM001-1E61 (scsi) Disk /dev/sdb: 2000GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 2000GB 2000GB primary ntfs raid There is no ntfs filesystem on the disk, I've still not worked out how to remove that flag. I've followed the article here --> http://www.cyberciti.biz/tips/linux-...ild-speed.html to attempt to speed it up but no joy. Any Ideas what I've done wrong? parted output [root@nas ~]# parted -l Model: ATA ST31000528AS (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 525MB 524MB primary ext4 boot 2 525MB 1000GB 1000GB primary lvm Model: ATA ST2000DM001-1E61 (scsi) Disk /dev/sdb: 2000GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 2000GB 2000GB primary ntfs raid Model: ATA ST2000DM001-9YN1 (scsi) Disk /dev/sdc: 2000GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 2000GB 2000GB primary raid Model: ATA WDC WD25EZRS-00J (scsi) Disk /dev/sdd: 2500GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 2000GB 2000GB primary ntfs raid Model: ATA ST2000DL001-9VT1 (scsi) Disk /dev/sde: 2000GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 2000GB 2000GB primary raid |
there's definity something wrong with sdb...
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util sdb 3.26 1005.29 0.03 8.06 0.01 3.96 1004.23 3.97 485.04 122.39 99.08 sdc 1512.55 1014.82 22.23 8.53 6.00 4.00 665.20 6.33 205.71 4.58 14.08 sda 5.37 5.36 1.51 1.94 0.04 0.03 40.56 0.17 48.75 5.61 1.93 sdd 1521.43 1014.82 13.44 8.38 6.00 4.00 937.55 17.97 823.46 9.82 21.43 sde 1520.76 1014.95 14.01 8.41 6.00 4.00 912.80 11.94 532.72 7.89 17.7 3.96 MB is 100% It's a replacement disk from seagate only 80 odd hours in smart... So what makes a sata disk that slow |
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