Hi all, > So with 8 threads doing random I/O of 4k blocks in a 1000 GB file > results in IOPS in the range of about 20,000. The same setup with > a file of 10,000 GB results in an IOPS of about 400. That is about > the same rate the HDDs have without bcache. This is something I did > not expect. It looks like bcache stopped to work at all...
I have to correct it: I rebuild the SSD-RAID and used now an RAID 0 instead of RAID 6 for caching. So now I get about 10.000 IOPS with writing 4k blocks . I think this is a) ok and b) it is not a bcache problem I suspect it is a problem of the raid controller, but I have no clue which one... Probably it is a better decision to use a separate raid controller for SSD (b)cache... Best regards Dirk -- +----------------------------------------------------------------------+ | Dr. Dirk Geschke / Plankensteinweg 61 / 85435 Erding | | Telefon: 08122-559448 / Mobil: 0176-96906350 / Fax: 08122-9818106 | | [email protected] / [email protected] / [email protected] | +----------------------------------------------------------------------+ -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
