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Hello Yall, |
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|
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I found a way to by-pass the problem, so I'm sending it to the list so |
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that it's archived. |
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|
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It's a problem between the software raid devices and DRBD's metadata. |
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My metadata was internal. So, the solution is to put the metadata out |
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of the /dev/md? device. Do it and it'll start in one second. I didn't |
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try to put the metadata on a separate MD device. |
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|
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The problem is that with the metadata out of the RAID1, then you have |
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a problem if the metadata harddrive fails. That's why I'm still |
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persuing this. |
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|
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Best regards, |
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Daniel Colchete |
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|
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On 12/7/06, Daniel van Ham Colchete <daniel.colchete@×××××.com> wrote: |
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> Hello Yall, |
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> |
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> I'm starting to play with DRBD to build a small (2-node) failsafe cluster here. |
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> |
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> The problem is, although DRBD starts really quickly with my SATA |
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> drive, with the MD (software RAID) device it's REALLY slow. |
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> |
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> It's like: |
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> |
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> Dec 7 18:41:12 mail0 drbd0: resync bitmap: bits=87603792 words=2737620 |
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> Dec 7 18:41:12 mail0 drbd0: size = 334 GB (350415168 KB) |
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> Dec 7 18:44:49 mail0 drbd0: 0 KB marked out-of-sync by on disk bit-map. |
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> Dec 7 18:44:50 mail0 drbd1: resync bitmap: bits=50975584 words=1592988 |
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> Dec 7 18:44:50 mail0 drbd1: size = 194 GB (203902336 KB) |
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> Dec 7 18:44:51 mail0 drbd1: 0 KB marked out-of-sync by on disk bit-map. |
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> |
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> DRBD0 is built over /dev/md4 that is built over two SATA disks. |
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> |
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> While this load process is running, I tried a dstat -df to see what |
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> disk activity I'm having and I found out that DRBD was reading at |
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> 100Kbps. |
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> |
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> On the other server it happens exactly otherwise. That's because the |
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> DRBD0 is on the SATA and DRBD1 is on the MD4: |
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> |
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> Dec 7 18:41:12 www0 drbd0: resync bitmap: bits=87603792 words=2737620 |
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> Dec 7 18:41:12 www0 drbd0: size = 334 GB (350415168 KB) |
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> Dec 7 18:41:14 www0 drbd0: 0 KB marked out-of-sync by on disk bit-map. |
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> Dec 7 18:41:14 www0 drbd1: resync bitmap: bits=50975584 words=1592988 |
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> Dec 7 18:41:14 www0 drbd1: size = 194 GB (203902336 KB) |
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> Dec 7 18:43:19 www0 drbd1: 0 KB marked out-of-sync by on disk bit-map. |
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> |
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> And that proves that it is a problem with the DRBD-SoftwareRAID couple. |
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> |
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> Versions: |
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> Kernel: 2.6.18-gentoo-r3 |
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> DRBD: 0.7.22 (although it's not on Portage, it's the only one that |
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> works with kernel 2.6.18). |
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> |
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> Thank you all. |
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> |
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> Best regards, |
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> Daniel Colchete |
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> |
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-- |
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