On 08/18/2009 10:57 AM, Greg KH wrote:
On Tue, Aug 18, 2009 at 09:59:56AM -0400, Ric Wheeler wrote:On 08/18/2009 09:25 AM, Greg KH wrote:On Tue, Aug 18, 2009 at 09:18:30AM -0400, Ric Wheeler wrote:We have a new toy to test very large& slow storage with built up from 5 SAS expansion shelves (Promise Vtrak J-Class) with 60 S-ATA drives and 16 SAS drives (the S-ATA drives each have a Promise Vtrak S-ATA MUX adapter daughter card in the disk sled). The basic idea is to build a cheap& slow test bed for file& storage system scalability. Collectively, we have about 120TB (raw) of capacity to play with in one server. As we work through various issues, a couple of oddities popped out. The first is that udev grumbles during boot about "file name too long" like the following: Aug 17 06:49:58 megadeth udevd-event[20447]: unable to create db file '/dev/.udev/db/\x2fdevices\x2fpci0000:00\x2f0000:00:04.0\x2f0000:17:00.0\x2f0000:18:0a.0\x2f0000:1f:00.0\x2fhost11\x2fport-11:0\x2fexpander-11:0\x2fport-11:0:0\x2fexpander-11:1\x2fport-11:1:0\x2fexpander-11:2\x2fport-11:2:17\x2fexpander-11:3\x2fport-11:3:1\x2fend_device-11:3:1\x2fbsg\x2fend_device-11:3:1': File name too longOdd, what is the sysfs tree for this device? You have expanders attached to ports attached to expanders? How deep can you go? thanks, greg k-hThere are two dual-port SAS HBA's in the server that plug into the first of the 5 SAS expansion shelves. Each shelf has two internal SAS loops and is daisy chained to the next shelf.... This test is running with just the first 4 shelves active (although that fifth shelf is plugged in, just not used/active). Each of the 60 S-ATA disks sits behind a MUX card which lets it appear on both loops. We could break up the shelves into two independent sets of devices which would limit the tree depth. How can I get you the sysfs tree information in a useful way?'tree /sys/devices/' or 'find /sys/devices/' would be good. thanks, greg k-h
Attached is the bzipped output from - the uncompressed output is quite large. Note that this same server has CCIS controllers and fibre HBA's as well,
ric
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