It quickly went back to the slow transfer speeds mentioned before. I have recently noticed that write speed to the raid array is very slow. Either a disk is going bad or theres a configuration issue youre not aware of or have discarded as a variable. When i migrated simply moved the mirrored disks over, from the old server ubuntu 9. I then stopped the transfer and tried the single directory test and achieved the. When i copy some large files to the raid, its is very fast 90 mbsec. Slow transfer speeds on synology nas bob mckays blog. If anything is using the array writing to the fs mdadm slows down the rebuild to the minimum value. Slow speeds with hyper backup rsync copy remote backup self. 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. When i changed sync to async or just put in defaults i got normal performance.
Using same hardw the unix and linux forums rsync quite slow using very little cpu. Raid rebuilding speed was very slow as you can view below output. You are running cat on procmdstat repeatedly you should really use watch in. I have the nfsshare mounted locally and compared speeddifferences while copying a directory with 30 files, around 15 vmimages and corresponding log files. When running windows bootcamp on the same machine i get much better performance. High speed storage solutions optimized for video production. Ill try to look at my logs when ill have access back. And here is the question would it not be better for me to set up rsync between the disks or something that can keep them in sync.
Im using rsync to copy about 28tb of images to a 36tb raid 5. Finally, you have know that a raid reshape is going to be slow, there is no way. I have tried removing one drive speed tests are the same for each drive on its own running osx 10. Slow readwrite performance on a logical mdadm raid 1 setup. Creating, assembling and rebuilding small array is fine. The speed bounces between 58 mb s and 33 mb s, which indicates there may be some buffer or congestion control problems. The source has ssds and the destination has 6 8tb 7200 sata3 512e drives in a raid 5 configuration. Slow transfer speeds on synology nas so youve got a shiny new synology nas and youve started storing files on it, videos, music and so forth. Super slow parity check speed starting a new raid im setting up a new synology server with all working drives they were on a zfs pool i build 2 years ago and has been working just fine. This overrides one of rsync s built in safety features. Allows you to limit how much bandwidth rsync uses in its network communications. 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.
Speed up linux mdadm raid rebuilding and resyncing query admin. My question would there be any speed benefit by using an rsync server instead of nfs for the backup operations. Qnap has limited the amount of resources dedicated to their nas lineup when rebuilding a raid array or performing rsync backups. The fact that the stats report is showing a huge speedup factor, and the actual data transfer is small compared to the final directory size indicates to me that rsync definitely is not just copying everything over. Solution windows software mirroring way to speed up rebuild. Speed up linux mdadm raid rebuilding and resyncing. Is there any parameter that can be configured to speed up the resynching. Speed up rsync with simultaneousconcurrent file transfers. I am using option rsync avz and exclude log files and junk scott has a good point here for your amount of data. Sep 25, 2012 i am using the rsync binary from deltacopy and its extremely slow. If anyone else has done this before, please let me know if this is normal or if there is something wrong. Since its software raid would taking apart the nas, ripping out the disks. Software raid 6 can be a bit slow on the performance end at times, but not nearly as bad as it once was. Solution windows software mirroring way to speed up.
Newer raid controllers can handle it at almost the same speed as raid 5, but im not sure how well synologys handle it. If you notice lower than expected performance with an ssd software raid 1 you should. Speed up linux software raid various command line tips to increase the speed of linux software raid 015610 reconstruction and rebuild time. Rsync slow over internet closed ask question asked 5 years. The following hacks are used for recovering linux software raid, and to increase the speed of raid rebuilds. Alternative to rsync for increased nfscifs throughput. Excruciatingly slow raid rebuild mdadm ubuntu forums. The success rate of raid depends largely on the data sync among the disks. 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.
Speed very slow when resync hard disk with mdadm server fault. Since its software raid would taking apart the nas, ripping out the disks, attaching them elsewhere one by one and. Increase the speed of linux software raid reconstruction. Synology diskstation runs very slow with apple community. The server has two 1tb disks, in a software raid1 array, using. 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. Reassemble, sync, and repeat with the other member. This best practice guide provides general recommendation for configuring qnap nas storage systems for best performance. It is currently at 1% at its saying finish9122min, speed1923ks thats over 6 days for an initial sync.
The following article looks at the recovery and resync operations of the linux software raid tools mdadm more closely. You can do that by changing the encryption method to a faster one such as arcfour or blowfish. Increase raid rebuild rsync performance for qnap nas. But, things started to get nasty when you try to rebuild or resync large size array. 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. This sped up the performance over the network to 96mbs rw. You can then check the resync speed by running watch against proc mdstat. Here we will show you a few commands and explain the steps.
Options are good for tweaking rebuilt process and may increase overall system load, high cpu and memory usage. Please note that i understand that a hardware raid would do this kind of thing faster but at this point i do not need suggestions which would involve that as a solution. Set rsync bandwidth limit to 5000 kbytes per second. This best practice is intended for qnap users, partners, and customers who are considering using qnap nas systems. 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%. Slow speeds with hyper backup rsync copy remote backup. I have set up a new omvbox with 2 x 1tb hard disk and the initial sync is extremly slow. I have the minimum rebuild speed set to ks and the maximum at 200000ks but the. If the resync speed of your mdadm software raid is slow, i. 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. If you have on access scan enabled, every file touched by rsync will cause your av software to look. How do i improve slow file transfer speeds between mac os 10. My question would there be any speed benefit by using an rsync server instead of nfs for the backup. It also looked like my services were running slower than normal possible.
Second, we dont know the type and speed of your destination array. A lot of software raids performance depends on the cpu that is in use. The fastest remote directory rsync over ssh archival i can muster 40mbs over 1gb nics this creates an archive that does the following. Mar 20, 2020 weve tried splitting the vms between different spindles raid groupings but i have not seen much improvement. This will limit the rebuild maximum throughput to 5mbs. I am using the rsync binary from deltacopy and its extremely slow. Then i dont need to worry about raid issues, slow write speed due to double write etc etc. Speed up standard resync with a writeintent bitmap. I am looking only for any suggestions that would speed up software mirroring. Over time weve switched vms over to incremental backups directly to the nfs mount and have been noticing a slow down recently. 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.
Raid resync helps devices to catchup with the raid and get data back on sync. Invoking rsync on the workstation with e rexec then uses rsh instead of ssh. Software controlled raid 1 taking very long to resync solved. Feb 27, 2015 the fact that the stats report is showing a huge speed up factor, and the actual data transfer is small compared to the final directory size indicates to me that rsync definitely is not just copying everything over. The files i copied are on a software raid 5 over 5 hdds. The files i copied are on a software raid5 over 5 hdds. In this best practice we will provide recommendation. The server has two 1tb disks, in a software raid1 array, using mdadm. Ive got a couple of them, one which i think is in raid 6.
In the examples, i use devmd0 as the raid array, youll have to change this to your array name. The server has two 1tb disks, in a software raid 1 array, using mdadm. You can do that by changing the encryption method to a faster one such as arcfour or. Hi there, i download build files from a server and i tend to use rsync, i tried ftp the other day for fun and i got twice the speed. Normally if there is a problem during the backup rsync will not run its delete pass. So the ability to do rsync processing on one versus the other can be dramatic.
If you dont use the checksum option, rsync checks the mtime and file size. I have recently migrated my file server over to a hp microserver. 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. It seems your new disk has some firmware or hardware related problem. That speed is the maximum speed rsync can transfer data. 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.
Unfortunately, the file transfer speeds are so bad youre considering buying a turtle and glueing a usb drive to its back to speed up file copying. 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. If i turn on cifs on the nas i can get in the upper 80s just dragging and dropping files from windows explorer from the san volume to nas cifs folder. Server peforms a resync for its software raid in defined intervals.
Rsync took over 10 hours today to transfer a 1gb file over the internet from one raspberry pi to another. Weve tried splitting the vms between different spindlesraid groupings but i have not seen much improvement. I noticed rsync is significantly slower in respect to my reference, freebsd 12current, running on exactly same hardware. On the software raid side you can try to take turns, kicking one disk out of the array, and then benchmark the raid. But the good news is the secondsubsequent runs are very fast if the incremental changes are just a small proportion of the total files.
The speed bounces between 58 mbs and 33 mbs, which indicates there may be. 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. In moments when with zfs busy column is red, rsync is having some kind of freeze current speed report is not updating anymore. Increase the speed of linux software raid reconstruction mdlog. Dec 11, 2019 set rsync speed limit on linux and unixlike systems. 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. How to increase speed of software raid rebuilding in linux. Initial rsync backup of large data slow to raid 5 unix. With the readynas doing software raid on that single core while most samsds have external hardware raid doing offload processing for that function. When disks is formated as zfs they are simple pool no raidz, etc intel ssd x25m g2 80gb with ufs. 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.