Another note lvm really slows down performance with drbd. Software controlled raid 1 taking very long to resync solved. If the raid controller is smart and not all raid controllers are very smart then itll give you the first available read from the mirror set, based on the rotational position. But the good news is the secondsubsequent runs are very fast if the incremental changes are just a small proportion of the total files. I made sure i backed up the stripe somewhere each day with rsync.
I am using the rsync binary from deltacopy and its extremely slow. The workstation has a fx8150 cpu that has a native aesni instruction set which speeds up encryption. A workaround would be to use the native tool to do the sync jo. The big advantage of rsync is the ability to split io across multiple devices. 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. With rtrr, the source nas monitors files including files in qsync and time machine backup folders and synchronizes the changes to the destination server. Have you ever tried rsyncd to transfer data between machines. This is about a number stored in the file metadata. If anyone else has done this before, please let me know if this is normal or if there is something wrong. The source has ssds and the destination has 6 8tb 7200 sata3 512e drives in a raid 5 configuration.
It seems your new disk has some firmware or hardware related problem. 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. Increase the speed of linux software raid reconstruction mdlog. Its not encrypted as well, has no additional overhead and i got transfer speeds between two freebsdbased machines both raidz1 of about 6070 mbs. If they perform around the same then youve got a deeper problem. Rclone rclone is a command line program for syncing files and directories to and from various cloud storage. Then i dont need to worry about raid issues, slow write speed due to double write etc etc. 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. The volume itself is encrypted with the same cipher. 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. 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. 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. 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.
This will limit the rebuild maximum throughput to 5mbs. The read speeds are sufficiently fast but writing is very slow. Increase raid rebuild rsync performance for qnap nas. If you run top while rsyncing youll probabky see rsync pegged at 100% cpu on a single thread.
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. Set rsync bandwidth limit to 5000 kbytes per second. How to increase speed of software raid rebuilding in linux. Reassemble, sync, and repeat with the other member. Im using rsync to copy about 28tb of images to a 36tb raid 5.
The following article looks at the recovery and resync operations of the linux software raid tools mdadm more closely. Feb 27, 2015 the successful rsync on the previous time has set the destination timestamp to be identical to the timestamp of the source. 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. To verify that this is the problem, on any os with a bash, just type time ls ral filelist. How to keep rsync command from using all of my bandwidth. Invoking rsync on the workstation with e rexec then uses rsh instead of ssh. Software controlled raid 1 taking very long to resync. 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.
Instructor alright so lets try out swap and rsyncand mirroring, youre supposed to make a swap file. The files i copied are on a software raid5 over 5 hdds. The following hacks are used for recovering linux software raid, and to increase the speed of raid rebuilds. Mdadm is linux based software that allows you to use the operating system to create and. 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. With the readynas doing software raid on that single core while most samsds have external hardware raid doing offload processing for that function. 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. Software raid how to optimize software raid on linux using. On the software raid side you can try to take turns, kicking one disk out of the array, and then benchmark the raid.
Raid1 resync very very slow using mdadm i am running kernel 2. Using mdadm i setup a raid1 array between two western digital 1. So the ability to do rsync processing on one versus the other can be dramatic. Cwrsync takes 30 minutes just to send the file list even if there is no new files to copy. 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%. 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.
Complete solutions for remote backup and data migration. 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. 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. For us that means raid 0, which is by far the fastest. Its easy to created several file systems and select the correct master slave disk for replication. 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.
Qnap has limited the amount of resources dedicated to their nas lineup when rebuilding a raid array or performing rsync backups. I wanted to slow down or pause the resync process to save some io to backup. And the raid got created and was visible in webinterface. Where that can fail is either you dont force the rsync to sync the timemetadata or the destination filesystem does not store the timemetadata. I am considering tearing down an old dual p3 1ghz freenas file server with 4x wd 1. 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. If 1 tb is enough for you and you have 2x1tb of disks, just set up a raid1. Raid rebuilding speed was very slow as you can view below output. Create raid 1 with existing data disk raid openmediavault. At first i thought it was just poor performance under raid 1 but it is occuring with raid 0 although not as bad. Remote backup instant remote backup and data migration qnap.
We know that software raid in windows has always sucked. The files i copied are on a software raid 5 over 5 hdds. 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. Here we will show you a few commands and explain the steps. Raid have never ever been a replacement for backups. Check the output from top or htop and youll probably see something like that.
Plus that would double the amount of swap you put out. Without backups on a different system preferably placed at another site, you will eventually lose data. Well you need a file and you need to make it swapish,so lets make a file. Walter, you seem to have an infrastructure that can facilitate higher transfer rates. Just a 500 mg file, just for something, and then we makeswap on it, there we go. 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. Larry jordan mentions that with the new multi cam of fcpx you have to have a raid. 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. Desktop computers are not backed up individually, but users are advised that their personal account on their departments file server will be backed up. Though a software raid will use system resources and willmay slow the system down.
If anything is using the array writing to the fs mdadm slows down the rebuild to the minimum value. But, things started to get nasty when you try to rebuild or resync large size array. It does only have a intel 100mbps pci nic, but it should top out at around 12. The way to make rsync have the same performance as cp is to spell it cp. I am getting very slow write speeds raid 1 and raid 0 striping and mirroring. 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%. Initial rsync backup of large data slow to raid 5 unix.
Options are good for tweaking rebuilt process and may increase overall system load, high cpu and memory usage. Server peforms a resync for its software raid in defined intervals. The difference between the two commands is significant even though the net effect may be the same. 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. How to improve rsync performance icesquare solve computer. You are running cat on procmdstat repeatedly you should really use watch in. There are many good reasons to use raid on the desktop including performance, data availability and system high availability. In particular, rsync does a bunch of reading to see whether or not some file or part of a file should be copied. Monuted it, created a filesystem on it and started creating shares. Remote backup instant remote backup and data migration. 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. Speed very slow when resync hard disk with mdadm server fault.
And we need to make sure that permission modes are safeon that guy. Synology diskstation runs very slow with apple community. If rsync is your transport of choice, consider copying using multiple rsync sessions. Since different operating systems handle major and minor numbers differently i suggest excluding dev.
I have veeam installed on 8core win2008 r2 physical machine, backup repo is an iscsi san volume. I respectfully disagree that raid is usually a terrible idea. 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. Slow transfer rates to raid5 array in freenas file server. 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. How to set the block size of software raid christopher. Speed up linux software raid various command line tips to increase the. Anyone familiar with mdadm rebuilds give me pointers on how to speed this up. Crossplatform handling of dev and other device files. Oct 08, 20 4 replies to how to improve rsync performance andiz january 17, 2014 at 4. Aug 11, 2014 hello, i need to backup a remote nas from another one in the same local network. Hello, i need to backup a remote nas from another one in the same local network. How do i make omv mount the md0 raid permanently, also after.
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. The successful rsync on the previous time has set the destination timestamp to be identical to the timestamp of the source. 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. Setting up a full scheduled rsync between two individual disks is just making a worse, manual raid1. Ive rarely seen a single rsync session run over 50mbs.
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. Excruciatingly slow raid rebuild mdadm ubuntu forums. Had a reboot in between and the md0 got not mounted. As mentioned above, on debianubuntu systems the etccron. Increase the speed of linux software raid reconstruction.
With rsync in webinterface i started copying all shared folders from the ntfs data drive to the new raid. Mostly for small businesses, using under 25 workstations. Though if the raid card fails it may take longer to get the raid back online, unless a spare raid card is on hand. How to set rsync speed limit from eating all bandwidth. 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. It says it will take another 1200 minutes and the speed has been bouncing around between 10,000,000 ksec. The speed bounces between 58 mb s and 33 mb s, which indicates there may be some buffer or congestion control problems. In a raid1 setup, one disk is used, the other one has an exact copy of your data. 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.
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