I have one of these. Great machine. I run FreeNAS on mine and use it as an ISCSI target for my esxi datastores and also as a NAS for my workstation automount.
First question before we go any further on performance. Have you installed the modified BIOS for this system from "thebay"? This mod enables full SATA performance for the system, enables hotswap drives and overall better IO perfomance with the existing hardware. If you have not done this mod yet, go here http://n40l.wikia.com/wiki/Bios and follow the instructions. If you need help, I have the image for the update handy. More extensive googling on HP N54L Bios will explain it for you. If you have done the mod, you might need to check default blocksizes etc.... rachel -- rachel polanskis <[email protected]> > On 18 Mar 2014, at 13:28, Jeff Allison <[email protected]> wrote: > > 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-raid-increase-resync-rebuild-speed.html > to attempt to speed it up but no joy. > > iostat -x -m5 implies that the disk is at 100% when writing at 4.2 > MB/s, so there's something very wrong somewhere. > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await svctm %util > sdb 0.00 711.20 0.00 8.40 0.00 4.20 > 1024.00 97.42 9441.55 119.05 100.00 > > 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 > -- > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
