Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi guys, a) 4TB Soft Limit when using External Meta Disk I've noticed that there's a 4TB soft limit in place when using an External Meta Disk. (i.e, "meta-disk /dev/sdx1[0]" inside your drbd.conf file in the "net" section) Pretty sure this isn't anything to do with weird math or stuff, because it's limited at *exactly* 4,000,000MB if you use a disk larger than 4TB - (I tried with a 6TB array and a 5TB array to) rather than our usual power-of-two-number. After pouring through loads of forum posts, I sincerely doubt this has anything to do with the size of my external meta disk - for 4TB you only need somewhere around ~180MB - and I've tried with 2GB and 8GB meta disks. You should be able to replicate this as of "version: 8.3.1 (api:88/proto:86-89)". To draw a contrast, you can try those very same arrays and use the default internal meta-disk (i.e, "meta-disk internal" inside your drbd.conf file). --- b) Increased Performance with External Meta Disks Apart from that, after running loads of dd-write's, I've personally found that using an External Meta Disk greatly boosts performance, especially in sync'ing - my results were on the average: 60,544 (62,132) K/sec - External meta disk 46,072 (46,204) K/sec - Internal meta disk You can see a clear 15 to 25MB/s increase, even with initial sync. Thought I'd just share this. Thanks. Regards, Kelvin Leong -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20090531/fc0f4e96/attachment.htm>