Messages in this thread | | | Date | Sat, 05 Nov 2005 09:06:08 +0000 | From | Alex Bligh - linux-kernel <> | Subject | Re: 3ware 9550SX problems - mke2fs incredibly slow writing last third of inode tables |
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Adam,
>> All seems to go well until I try and do mke2fs. This appears to work, >> and tries to write the inode tables. However, at (about) 3400 inodes >> (of 11176), it slows to a crawl, writing one table every 10 seconds. >> strace shows it is still running, and no errors are being reported. >> However, it seems very sick. > > Do you have cache turned on or off? If it's off, try turning it on.
On. I started again (deleted the units etc.) which I'd done before. I am not sure quite what I did different this time. Now I get 270Mb/s on dbench, 100Mb/s (approx) on a solid contiguous write (dd), which is well into the field of uninspiring but not as daft as 7Mb/s. I had rather expected that h/w RAID 5 would give me faster reads, and only slightly degraded writes, compared to a single disk of the same type plugged into the motherboard SATA.
However, dbench puts the (dual opteron 275) machine into 99% system state. Is that normal? Surely it should be in i/o wait.
I /think/ what had happened is this: When I press F8 to exit the BIOS, it did not initialize the array (this is in accordance with the manual, it being deferred). Despite leaving the machine idle in the O/S for 2 days, it didn't start initializing the array. Running the mkfs started the initialization (would that make sense)? The second time I ran mkfs, I may have already (somehow) triggered it to start earlier.
I shall try and work out some soak test I can run on it this w/e.
-- Alex Bligh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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