A little RAID experiment
I know you were interested in hardware RAID controllers, but out of curiosity, this is the result on a 16 x 1TB SATA linux md software RAID6 array.
Formatted xfs, with external journal on an independent SATA device, mounted delaylog,inode64,logbsize=256k,logdev=/dev/md0,noatime,pquota.
Operations performed: 0 Read, 26065 Write, 0 Other = 26065 Total Read 0b Written 203.63Mb Total transferred 203.63Mb (13.575Mb/sec)
1737.65 Requests/sec executed
Filesystem is 44% full, kernel 2.6.39.2.
xfs_bmap test_file.0
test_file.0:
0: [0..8388607]: 9565100544..9573489151
1: [8388608..16777215]: 9578354176..9586742783Regards,
Richard
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Le Fri, 27 Apr 2012 10:33:39 +1200 vous écriviez:
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Formatted xfs, with external journal on an independent SATA device, mounted delaylog,inode64,logbsize=256k,logdev=/dev/md0,noatime,pquota.
Wouldn't it be preferable to use the RAID controller to host the log device? This way you profit from the write cache, as the log easily fits in.
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http://oss.sgi.com/mailman/listinfo/xfsQuoted 3 lines · Emmanuel Florac
Wouldn't it be preferable to use the RAID controller to host the log device? This way you profit from the write cache, as the log easily fits in.
This setup is md software RAID ;). The controller is an LSI 1068 using initiator-target firmware. There is no write cache I am aware of.
Regards,
Richard
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