Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi Philipp, Thanks very much for such valuable response, it helps me a lot. BTW, is the proprietary add-on module for IB (wit rdma) from LINBIT a open source or sold with LINBIT production? Could you please provide some details for it? e.g. the URL link. Best regards, Gu ------------------ 原始邮件 ------------------ 发件人: "Philipp Reisner";<philipp.reisner at linbit.com>; 发送时间: 2015年8月31日(星期一) 下午3:57 收件人: "drbd-user"<drbd-user at lists.linbit.com>; 抄送: "顾政"<cengku at gmail.com>; 主题: Re: [DRBD-user] [Questions] Many questions about DRBD Am Mittwoch, 26. August 2015, 10:36:16 schrieb 顾政: > Hi guys, > > I am a new comer to DRBD, as we want to use drbd for data backup, and I > have some questions about drbd, so hope you guys can help me a lot. > > 1. Does drbd support rdma for IB (InfiniBand)? as we need to use IB for > high performance network rather tcp/ip. Yes, it does. By a proprietary add-on module from LINBIT. > 2. How is the local I/O performance drop degradation if compared without > drbd used? Very depended on your hardware. Under optimal circumstances (network link strong enough, CPU powerfull to handly IO requests) it can be below 3% in throughput. > 3. How many replicate modes does drbd support? e.g. sync, async or other > ones. C - synchronous, B - memory synchronous, A - asynchronous > 4. Does it support intermittently replicate ? I mean, sometime we turn-off > copying data to remote backup device, sometime we can turn-on it again, and > them force them to be synchronous via some manual intervention (e.g. rsync). Yes it support temporal network failures or/and administratively imposed pauses of the synchronization process. As soon as the connection is re-established (or re-enabled) DRBD does a "resync" by itself. I.e. it copies over the 4k blocks that was touched on the primary node during the pause of the mirroring. Best regards, phil -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20150901/71bbf96b/attachment.htm>