Software raid rsync slow

How do i make omv mount the md0 raid permanently, also after. Finally, raid or rsync, do not forget to have a good backup policy. Ive rarely seen a single rsync session run over 50mbs. 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. To verify that this is the problem, on any os with a bash, just type time ls ral filelist. One way to take advantage of the speed of a raid array multiple disks equals multiple readwrite heads and a gige network is to use splits parallel data streams from each client and, potentially backup multiple clients simultaneously. If you use a good hardware raid, which does its own processing, it will free system resources and should be faster than a software raid. Though if the raid card fails it may take longer to get the raid back online, unless a spare raid card is on hand. The read speeds are sufficiently fast but writing is very slow. Im using rsync to copy about 28tb of images to a 36tb raid 5. It has been consistently giving me 6mbsec transfer rates. Apr 08, 2011 windows 7 raid 1 slow resynch i am running windows 7 pro x64, and have set up software raid using two 1 tb hard drives. I wanted to slow down or pause the resync process to save some io to backup. Backups on tape having been deemed too slow and costly, data will be backed up on hard drives on a dedicated server, on which the use of software raid see section 12.

Mostly for small businesses, using under 25 workstations. The speed bounces between 58 mb s and 33 mb s, which indicates there may be some buffer or congestion control problems. Had a reboot in between and the md0 got not mounted. Its easy to created several file systems and select the correct master slave disk for replication. Software controlled raid 1 taking very long to resync. Set rsync bandwidth limit to 5000 kbytes per second. Ive added the new disk mdadm add devmd0 devsdb and grown the array mdadm grow devmd0 raid devices4 now the problem the resync speed is v slow, it refuses to rise above 5mb, in general it sits at 4m. Oct 08, 20 4 replies to how to improve rsync performance andiz january 17, 2014 at 4. The workstation has a fx8150 cpu that has a native aesni instruction set which speeds up encryption. I would suggest adding the swap as a raid 0, that way if your server hits heavy load it can benefit from the raid 0 striping. In particular, rsync does a bunch of reading to see whether or not some file or part of a file should be copied. Raid1 resync very very slow using mdadm i am running kernel 2.

Aug 11, 2014 hello, i need to backup a remote nas from another one in the same local network. Speed up linux software raid various command line tips to increase the. This isnt so bad if youre talking about a relatively small number of files, or a situation where there is a client running rsync and a server running the rsync daemon, but if youre doing this with a large filesystem big files, lot of files, possibly both this can be quite slow. Just a 500 mg file, just for something, and then we makeswap on it, there we go.

The delete option can also cause a slow rsync, if retrieving the complete filelist of the target location is slow which is probable for an external, rotating usb disk. Setting up a full scheduled rsync between two individual disks is just making a worse, manual raid1. The following hacks are used for recovering linux software raid, and to increase the speed of raid rebuilds. I just set up a raid 1 array today with 2 wd caviar green hdds, and they have been resynching for about 5 hours, and they are only at about 50%. A non raid configuration including raid 0, which isnt really raid with a backup on a separate media protects your data far better than any raid volume without backup. Have you ever tried rsyncd to transfer data between machines. I made sure i backed up the stripe somewhere each day with rsync.

Qnap nas provides not only allencompassing backup solutions, but also a whole range of methods for fully backing up the contents of the nas, adding an extra layer of protection for your data in the event of disaster recovery. Synology diskstation runs very slow with apple community. Invoking rsync on the workstation with e rexec then uses rsh instead of ssh. Windows 7 raid 1 slow resynch i am running windows 7 pro x64, and have set up software raid using two 1 tb hard drives. Many will just pick a disk and give you the io when the sector rotates around, so you will be waiting on average half a revolution. If 1 tb is enough for you and you have 2x1tb of disks, just set up a raid1.

With the readynas doing software raid on that single core while most samsds have external hardware raid doing offload processing for that function. And we need to make sure that permission modes are safeon that guy. Ive added the new disk mdadm add devmd0 devsdb and grown the array mdadm grow devmd0 raiddevices4 now the problem the resync speed is v slow, it refuses to rise above 5mb, in general. Increase the speed of linux software raid reconstruction. If anyone else has done this before, please let me know if this is normal or if there is something wrong. Walter, you seem to have an infrastructure that can facilitate higher transfer rates. This will limit the rebuild maximum throughput to 5mbs.

With rtrr, the source nas monitors files including files in qsync and time machine backup folders and synchronizes the changes to the destination server. I respectfully disagree that raid is usually a terrible idea. Dec 18, 2012 i just set up a raid 1 array today with 2 wd caviar green hdds, and they have been resynching for about 5 hours, and they are only at about 50%. Crossplatform handling of dev and other device files. This is about a number stored in the file metadata. The way to make rsync have the same performance as cp is to spell it cp.

And hardware raid has been a great, but expensive and labor intensive, solution for those who have the expertise or can hire it as needed. I have veeam installed on 8core win2008 r2 physical machine, backup repo is an iscsi san volume. Mdadm is linux based software that allows you to use the operating system to create and. Software raid how to optimize software raid on linux using.

As mentioned above, on debianubuntu systems the etccron. The successful rsync on the previous time has set the destination timestamp to be identical to the timestamp of the source. Cwrsync takes 30 minutes just to send the file list even if there is no new files to copy. The volume itself is encrypted with the same cipher.

Data on the nas can be backed up to another remote qnap nas or ftp server on a realtime basis via qnaps rtrr service, or a standard rsync server on scheduled basis. Options are good for tweaking rebuilt process and may increase overall system load, high cpu and memory usage. For us that means raid 0, which is by far the fastest. At first i thought it was just poor performance under raid 1 but it is occuring with raid 0 although not as bad.

Rclone rclone is a command line program for syncing files and directories to and from various cloud storage. Mar 17, 2014 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. Here we will show you a few commands and explain the steps. The decision here was to limit the amount of impact these types of processes have on your system in order to maintain an acceptable level of responsiveness. How to keep rsync command from using all of my bandwidth. Then i dont need to worry about raid issues, slow write speed due to double write etc etc. I am using the rsync binary from deltacopy and its extremely slow. But, things started to get nasty when you try to rebuild or resync large size array. If you run top while rsyncing youll probabky see rsync pegged at 100% cpu on a single thread. Raid 5 read performance will be good but writing is going to be slow also the 5400 rpm speed is not going to assist much with the slow writing but i realize there isnt too much you can do here outside of slightly faster residential grade drives like raptors. The big advantage of rsync is the ability to split io across multiple devices. If you do use raid other than raid 1 you should set the stripe size fairly small as most of the work for rsync backups is done at the file system metadata level not the large file level. Its not encrypted as well, has no additional overhead and i got transfer speeds between two freebsdbased machines both raidz1 of about 6070 mbs.

Where that can fail is either you dont force the rsync to sync the timemetadata or the destination filesystem does not store the timemetadata. Server peforms a resync for its software raid in defined intervals. Slow transfer rates to raid5 array in freenas file server. Desktop computers are not backed up individually, but users are advised that their personal account on their departments file server will be backed up.

Check the output from top or htop and youll probably see something like that. Excruciatingly slow raid rebuild mdadm ubuntu forums. Initial rsync backup of large data slow to raid 5 unix. Remote backup instant remote backup and data migration. But the good news is the secondsubsequent runs are very fast if the incremental changes are just a small proportion of the total files. Anyone familiar with mdadm rebuilds give me pointers on how to speed this up. Another note lvm really slows down performance with drbd. The difference between the two commands is significant even though the net effect may be the same. So the ability to do rsync processing on one versus the other can be dramatic.

Larry jordan mentions that with the new multi cam of fcpx you have to have a raid. Remote backup instant remote backup and data migration qnap. There are many good reasons to use raid on the desktop including performance, data availability and system high availability. Raid have never ever been a replacement for backups. I am getting very slow write speeds raid 1 and raid 0 striping and mirroring. Suggesting that implementing raid is a bad idea because the builtin raid controllers are of low quality is akin to saying that doing 3d graphics is a bad. Hello, i need to backup a remote nas from another one in the same local network. Plus that would double the amount of swap you put out. Until today i used deltacopy that uses the same process and the same dlls and deltacopy needs 8 to 10 minutes to send file list for the same folder and the same command line and arguments. Raid rebuilding speed was very slow as you can view below output. If you do use raid other than raid1 you should set the stripe size fairly small as most of the work for rsync backups is done at the file system metadata level not the large file level. It seems your new disk has some firmware or hardware related problem.

You are running cat on procmdstat repeatedly you should really use watch in. If anything is using the array writing to the fs mdadm slows down the rebuild to the minimum value. How to set rsync speed limit from eating all bandwidth. A nonraid configuration including raid 0, which isnt really raid with a backup on a separate media protects your data far better than any raidvolume without backup.

Since different operating systems handle major and minor numbers differently i suggest excluding dev. When i use rsync over ssh, it is really slow 14 mbs, but the native backup tool included with the firmware can backup much faster and even in real time. Jan 09, 2008 the big advantage of rsync is the ability to split io across multiple devices. Reassemble, sync, and repeat with the other member. Feb 27, 2015 the successful rsync on the previous time has set the destination timestamp to be identical to the timestamp of the source. Create raid 1 with existing data disk raid openmediavault. Speed very slow when resync hard disk with mdadm server fault. How to increase speed of software raid rebuilding in linux. You can specify the maximum transfer rate for the data sent over the socket or network by typing the bwlimitrate option to the na command. On the software raid side you can try to take turns, kicking one disk out of the array, and then benchmark the raid. The files i copied are on a software raid5 over 5 hdds. Netgear readynas qnap i tried pulling the files by running rsync on the qnap, and that took forever, so im currently trying to push them from the netgear. Instructor alright so lets try out swap and rsyncand mirroring, youre supposed to make a swap file. Using mdadm i setup a raid1 array between two western digital 1.

How to set the block size of software raid christopher. With rsync in webinterface i started copying all shared folders from the ntfs data drive to the new raid. The source has ssds and the destination has 6 8tb 7200 sata3 512e drives in a raid 5 configuration. And the raid got created and was visible in webinterface. Well you need a file and you need to make it swapish,so lets make a file. Monuted it, created a filesystem on it and started creating shares. Setting up rsync to copy backup files to a nas that is also local over 1gb ethernet. It does only have a intel 100mbps pci nic, but it should top out at around 12. If they perform around the same then youve got a deeper problem. I am considering tearing down an old dual p3 1ghz freenas file server with 4x wd 1. Complete solutions for remote backup and data migration.

Software controlled raid 1 taking very long to resync solved. If rsync is your transport of choice, consider copying using multiple rsync sessions. Though a software raid will use system resources and willmay slow the system down. Increase the speed of linux software raid reconstruction jun 25 th, 2006 comments if you are in a situation where you sit in front of the console or on a remote ssh connection waiting for a linux software raid to finish rebuilding either you added a new drive, or you replaced a failed one, etc. Qnap has limited the amount of resources dedicated to their nas lineup when rebuilding a raid array or performing rsync backups. How to improve rsync performance icesquare solve computer. If you are in a situation where you sit in front of the console or on a remote ssh connection waiting for a linux software raid to finish rebuilding either you added a new drive, or you replaced a failed one, etc.

It says it will take another 1200 minutes and the speed has been bouncing around between 10,000,000 ksec. In a raid1 setup, one disk is used, the other one has an exact copy of your data. All of these devices provide rsync, the qnap also provides rtrr real time remote replication wed like to replicate veeam backups to our site in the uk over a vpn we have a 1gb link the remote site has only got a 10mb link, we would like to use the most bandwidth efficient method of replication we can. Without backups on a different system preferably placed at another site, you will eventually lose data. We know that software raid in windows has always sucked. The files i copied are on a software raid 5 over 5 hdds. Hi, ive been running backuppc for a while now and ive been noticing an odd trend, i have 29 servers which are identical in hardware and very similar in configuration. Increase the speed of linux software raid reconstruction mdlog. A workaround would be to use the native tool to do the sync jo. The following article looks at the recovery and resync operations of the linux software raid tools mdadm more closely.