Hello Daniel,

> Do you have a BBU on the raid controler ?

ADAPTEC 3805 RAID SAS/SATA 8−Kanal


> Hardware RAID without BBU (and of course, without write-back cache
> enabled) is usually *very* slow, much slower than simple disk system, or
> software RAID.

When you look at my other postings, the output of vmstat said that there  many 
blocks received from a block device and minimal blocks sent to a block device.

IMHO: BackupPC_nightly mainly reads from disk!?


Regards
Norbert


procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 1  5  18012 6913580 687380 433472    0    0     5     2    5    2  2  1 78 19
 0  2  18012 6920324 686976 435792    0    0  6011     4  553  248  1  0 62 37
 1  2  18012 6920696 687196 435684    0    0  5321    18  484  212  0  0 69 30
 0  2  18012 6920076 687804 435700    0    0  5780     6  499  203  0  0 67 33
 0  2  18012 6921572 687500 434432    0    0  5383     6  466  201  0  0 70 30
 0  2  18012 6922324 686708 434100    0    0  5476     4  478  204  0  0 70 30
 0  2  18012 6921728 687484 434068    0    0  5747     2  495  194  0  0 71 29
 0  2  18012 6921256 687628 434188    0    0  5632     1  497  209  0  0 70 29
 0  2  18012 6921404 687488 434092    0    0  5586    22  499  210  0  0 69 31
 0  2  18012 6921428 687596 433888    0    0  5784     2  496  206  0  0 69 31

------------------------------------------------------------------------------
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