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mkretzer
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Re: REFS 4k horror story

Post by mkretzer » Mar 03, 2017 6:12 am

Could it be the amount of fragmentation thats causing this? I checked our 4K volume before we deleted it and defrag showed 100 % fragmentation...

Gostev
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Re: REFS 4k horror story

Post by Gostev » Mar 03, 2017 4:45 pm 5 people like this post

All, I have some good news from Microsoft about this whole issue, stay tuned for the update soon!

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Re: REFS 4k horror story

Post by kubimike » Mar 03, 2017 8:06 pm 2 people like this post

What a tease

j.forsythe
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Re: REFS 4k horror story

Post by j.forsythe » Mar 07, 2017 8:58 am

Hi.
Sorry for the delay in answering
I have changed my setup to NTFS volumes and since then there has been no crash, or freeze.

@Mike Resseler
I have only installed the patches provided by automatic updates, I haven’t downloaded and installed anything. The Veeam support has been very slow at the beginning, took them 48h to respond. He told me the setup is correct, I should use the ReFS volume again to provoke a server frees and create a server memory dump for the support to analyse. He told as well that they may not be able to analyse anything and I end up opening a MS case, which I won't do.

@kubimike
I don't see much besides that the server is freezing. I have some Eventlogs regarding ReFS timeouts...
I have two rather small ReFS repositorys, 15TB at a local SAS attached HP P440ar controller. It is running in HBA mode and I used Storage Spaces to create a parity volume.
The iSCSI ReFS volume is 10TB connected with two 1Gb connections.

Both are 64k and it worked great for about 2 weeks. Now it turns the rest of my hair grey.

John

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Re: REFS 4k horror story

Post by kubimike » Mar 07, 2017 3:09 pm 1 person likes this post

@j.forsythe GEN9 box ? See this post about updating the UEFI veeam-backup-replication-f2/server-2016 ... ml#p231993

j.forsythe
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Re: REFS 4k horror story

Post by j.forsythe » Mar 07, 2017 3:27 pm

@kubimike
Yeah, it is an Gen9.
No I have not seen the post. I am downloading at the moment and will give it a try.
Thanks for the hint!

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Re: REFS 4k horror story

Post by kubimike » Mar 07, 2017 4:45 pm

@j.forsythe awesome, want to see if that solves your issues.

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Re: REFS 4k horror story

Post by skumflum » Mar 08, 2017 10:24 am

I have been running 4K REFS on my copy job repository (DR site replication with two restore points) and ran into BSOD and other horrible stuff. I reformatted my volume to 64K a week ago and so far no issue.

The volume is large – 45TB

However, I noticed that the volume is fragmented (88%). Is defragmentation needed on REFS?... I have a feeling that running defragmentation will not go well on 45TB.

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Re: REFS 4k horror story

Post by Gostev » Mar 08, 2017 2:26 pm

You should treat ReFS volume where block cloning was used as a sort of deduplication storage. You can never have it NOT fragmented due to the nature of the process (different files sharing the same physical block). As such, there's absolutely no point to perform defragmentation - just like there's no point in defragmenting a deduplicating storage. In fact, the only way to truly defragment any given file would require "inflating" one by recreating the file without leveraging block cloning. Does it make sense?

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Re: REFS 4k horror story

Post by j.forsythe » Mar 08, 2017 3:11 pm

Hello.
I have installed the HP patch from the following link, as mentioned by @kubimike
http://h20564.www2.hpe.com/hpsc/swd/pub ... nvOid=4231

The servers Intelligent Provisioning version is now 2.50.164, but to be honest I haven't checked before the update which version had been installed....
A small test backup didn't cause any problem with the ReFS repository, tonight there will be a bigger one and I will see in the morning if the backup server froze during the night.

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Re: REFS 4k horror story

Post by Richardrichard » Mar 08, 2017 3:26 pm

What was the MIcrosoft update please Gostev? I'm currently looking at Veeam and need to work out a best fit repository, need to know if ReFS is on the table.

WimVD
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Re: REFS 4k horror story

Post by WimVD » Mar 08, 2017 4:25 pm

Gostev wrote:All, I have some good news from Microsoft about this whole issue, stay tuned for the update soon!
Hi Gostev, any news to share yet? Need to install a ReFS repository this week and it would be nice if I can avoid any pitfalls...

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Re: REFS 4k horror story

Post by Mike Resseler » Mar 08, 2017 4:31 pm

Wim,

I can be wrong but I believe he shared it in his weekly digest. But I don't think there is actually a fix at this moment

Gostev
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Re: REFS 4k horror story

Post by Gostev » Mar 08, 2017 5:58 pm 1 person likes this post

Sorry folks, I've got into a little trouble for sharing those news too early in the weekly forum digest, so I need to limit the disclosure to that newsletter for now ;) but in short, the issue is now fully understood and will be addressed by Microsoft soon - the official word from the ReFS dev team should be posted any day now.

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Re: REFS 4k horror story

Post by graham8 » Mar 08, 2017 6:35 pm

Regardless of the specifics of when it will be resolved, it's at least good news just to hear that the actual dev team has become aware of the problem. That takes care of my main concern, which is that this might become one of those "unresolved for years" sorts of problems because the development team is simply never made aware of a serious issue by end-users via frontline support.

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