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CPCS
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Re: Recommended best allocation unit size for repository vol

Post by CPCS » Apr 29, 2016 9:58 am 1 person likes this post

and how about the allocation unit size inside Windows for the Repository Partition? Is veeam also creating small files on the repository or only the backup files which will be at least a few MB-TB so i should choose the max ntfs allocation unit size of 64kb??

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Re: Recommended best allocation unit size for repository vol

Post by albertwt » May 23, 2016 2:13 am

bbricker wrote:But I think that was for stripe size defined in the SAN, not the allocation unit size set when formatting a partition in Windows.
So what about the stripe size in your LUN RAID group or disk group ?
have you set it to 256 KB or make it the same 64 KB same as the largest NTFS Allocataion Unit Size ?
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albertwt
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Re: Recommended best allocation unit size for repository vol

Post by albertwt » May 23, 2016 2:29 am

CPCS wrote:
So how should it be configured for each logical drive, specially the Repository?
@CPCS, I'm on the similar situation as you. So did you end up with some recommendation that you can share here ?
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CPCS
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Re: Recommended best allocation unit size for repository vol

Post by CPCS » May 30, 2016 7:56 am 1 person likes this post

Suport only reverse to community or giving non concrete answers with no references >-<

After a lot of searching a used this sites to try to get an idea:

https://www.42u.ca/2016/03/21/veeam-rep ... es-part-2/
http://www.virtualtothecore.com/en/veea ... ripe-size/
http://www.mirazon.com/veeam-repository-best-practices/
https://www.koolaid.info/veeam-backup-r ... ion-notes/

This was also intersting (and seems to be the base for this pdf = Veeam Repository Best Practices presentations pdf from http://www.swovug.ca/resources/)

Backup Repository Best Practices: 2015 Edition
https://www.veeam.com/veeamon/recorded-sessions

In the end i used 512 stripe size in the raid for the repository with local target as storage optimization with a lot of hope that this wont break my neck in the future...

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Re: Recommended best allocation unit size for repository vol

Post by albertwt » May 30, 2016 11:38 pm

CPCS,

yes, that's what I've been told as well.

Anyway, I've managed to create multiple 15 TB NTFS LUNs on my HP DAS using:
Strip Size: 512 KiB
Full Stripe Size 2560 KiB
Thanks for the sharing.
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[MERGED] Block size / stripe

Post by mephisto » Jun 09, 2016 8:17 pm 1 person likes this post

Guys,

I'm in doubt about a couple of things, Veeam suggests the backups I/O is normally between 256/512KB, that means the stripe size of my raid array, be RAID-10 or RAID-5 for example should be larger than 256KB, right? I would assume the bigger the better for sequential writes as well?

Windows then formats a NTFS partition by default at 4k cluster size, and allows it to be up to 64KB (can't do higher, perhaps REFS will do?), so I also believe I should have this set up to 64KB as definitely we would not have small files with Veeam backups.

What do you guys think?

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Re: Recommended best allocation unit size for repository vol

Post by foggy » Jun 10, 2016 9:59 am

Please review considerations above.

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[MERGED] Recommended file allocation unit size query

Post by Trin » Jun 29, 2017 8:05 am

I've recently set up a 10TB iSCSI LUN on our Synology RS3617xs+ but I didn't pay attention to the file allocation unit size when doing so. A quick check suggests it's at 4k...

I want to start again but I'm not sure what the recommended size should be. Any advice would be very welcome.

Server - Windows Server 2016 VM
Repository - Synology RS3617xs+, RAID-6

Many thanks

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Re: Recommended best allocation unit size for repository vol

Post by PTide » Jun 29, 2017 11:07 am

Hi,

First, may I ask you what file system do you use? Is it NTFS or ReFS?

Thanks

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