[DRBD-user] 14TB storage with drbd82

Lee Christie Lee at titaninternet.co.uk
Mon Jul 28 11:15:15 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


We're running 8 separate devices. We chose to implement it slightly
differently to you - we use LVMs with drbd on top of those to remain
flexible with resizing. Presumably you don't want/need to resize your
drbd devices online ?

All works fine though.  

> -----Original Message-----
> From: drbd-user-bounces at lists.linbit.com 
> [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Andrei Neagoe
> Sent: 28 July 2008 10:02
> To: drbd-user at lists.linbit.com
> Subject: [DRBD-user] 14TB storage with drbd82
> 
> Hi,
> 
> I've managed to build up a storage cluster using drbd82 and 
> IBM's ds3200 
> storage boxes. Since there was a limit on the available storage that 
> could be replicated on drbd82 (8TB by Lars's latest update) I had to 
> create separate devices and use LVM on top of them. Here is how the 
> setup looks like:
> 
> [root at leviathan cluster]# cat /proc/drbd
> version: 8.2.6 (api:88/proto:86-88)
> GIT-hash: 3e69822d3bb4920a8c1bfdf7d647169eba7d2eb4 build by 
> buildsvn at c5-x8664-build, 2008-06-26 19:33:19
>  0: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134836056 nr:1853314662 dw:1853315170 dr:2134907815 al:12 
> bm:130324 lo:0 pe:0 ua:0 ap:0 oos:0
>  1: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134971458 nr:2118749947 dw:2118881761 dr:2134913166 al:45 
> bm:130342 lo:0 pe:0 ua:0 ap:0 oos:0
>  2: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134847300 nr:2118119779 dw:2118120107 dr:2134913953 al:13 
> bm:130338 lo:0 pe:0 ua:0 ap:0 oos:0
>  3: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134830488 nr:2120638053 dw:2120638113 dr:2134838392 al:1 
> bm:130301 lo:0 pe:0 ua:0 ap:0 oos:0
>  4: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134830488 nr:2118368965 dw:2118369025 dr:2134838392 al:1 
> bm:130301 lo:0 pe:0 ua:0 ap:0 oos:0
>  5: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134830488 nr:2118615810 dw:2118615870 dr:2134838392 al:1 
> bm:130301 lo:0 pe:0 ua:0 ap:0 oos:0
>  6: cs:Connected st:Secondary/Primary ds:UpToDate/UpToDate C r---
>     ns:2134830488 nr:2119457671 dw:2119457731 dr:2134838392 al:1 
> bm:130301 lo:0 pe:0 ua:0 ap:0 oos:0
> 
> [root at leviathan ~]# pvscan
>   PV /dev/drbd0   VG ftp   lvm2 [1.99 TB / 0    free]
>   PV /dev/drbd1   VG ftp   lvm2 [1.99 TB / 0    free]
>   PV /dev/drbd2   VG ftp   lvm2 [1.99 TB / 0    free]
>   PV /dev/drbd3   VG ftp   lvm2 [1.99 TB / 0    free]
>   PV /dev/drbd4   VG ftp   lvm2 [1.99 TB / 0    free]
>   PV /dev/drbd5   VG ftp   lvm2 [1.99 TB / 0    free]
>   PV /dev/drbd6   VG ftp   lvm2 [1.99 TB / 0    free]
>   Total: 7 [13.92 TB] / in use: 7 [13.92 TB] / in no VG: 0 [0   ]
> 
> [root at leviathan ~]# df -h
> Filesystem            Size  Used Avail Use% Mounted on
> ... OUTPUT OMITTED ...
> /dev/mapper/ftp-ftp    14T   14T  360G  98% /var/ftp
> 
> So far everything seems to be quite stable, I managed to fill the 
> storage with dd so it's actually being used, throughoutput is around 
> 70MB/s (using 1gbit xover link).
> My question is now about scalability, Lars mentioned that 
> it's possible 
> to do this but eventually we'd run into another limit. At 
> this point I 
> wonder what that limit could be so I can take it into account. Did 
> anybody managed to use drbd82 with more than 7 active devices? How 
> stable was it?
> 
> Thanks,
> Andrei.
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
> 

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