well some time ago i asked about a bcache with ssd and raid devices maybe, but only maybe, a bcache with two ssd raid1(10) + hdd raid1(10) could help you in my workload (50% read/write) the raid1 is faster than raid10, because i have more disks to read different tables / threads maybe only changing the raid layout could help too 2013/10/9 Andy Smith <andy@xxxxxxxxxxxxxx>: > Hello, > > Due to increasing load of random read IOPS I am considering using 8 > SSDs and md in my next server, instead of 8 SATA HDDs with > battery-backed hardware RAID. I am thinking of using Crucial m500s. > > Are there any gotchas to be aware of? I haven't much experience with > SSDs. > > If these were normal HDDs then (aside from small partitions for > /boot) I'd just RAID-10 for the main bulk of the storage. Is there > any reason not to do that with SSDs currently? > > I think I read somewhere that offline TRIM is only supported by md > for RAID-1, is that correct? If so, should I be finding a way to use > four pairs of RAID-1s, or does it not matter? > > Any insights appreciated. > > Cheers, > Andy > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Roberto Spadim -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
