it's resync running? i don't think it's a problem... any device will die some day... ssd is faster than hd, why not use it? i'm using hp smart array p212 with 3.0 firmware, it write on all blocks too maybe a just command line option to start array without sync could help... i don't know if resync is write intensive or just write on diferent blocks, if it's just diff it's not a problem for ssd... again... i know that the 'translate' of trim command to non compatible devices is a problem for device layer not md layer, but can md send trim command to all mirrors/disks? 2011/2/8 maurice <mhilarius@xxxxxxxxx>: > On 2/7/2011 1:07 PM, Roberto Spadim wrote: >> >> hi guys, could md send TRIM command to ssd? using ext4 discart mount >> option? >> if i mix ssd and hd, could this TRIM be rewrite to non TRIM compatible >> disks? >> > I have read that using md with SSDs is not a great idea: > Form the Fedora 14 documentation: > > "Take note as well that software RAID levels 1, 4, 5, and 6 are not > recommended for use on SSDs. > During the initialization stage of these RAID levels, some RAID management > utilities (such as mdadm) > write to all of the blocks on the storage device to ensure that checksums > operate properly. > This will cause the performance of the SSD to degrade quickly. " > > https://docs.fedoraproject.org/en-US/Fedora/14/html/Storage_Administration_Guide/newmds-ssdtuning.html > > > -- > Cheers, > Maurice Hilarius > eMail: /mhilarius@xxxxxxxxx/ > -- > 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 Spadim Technology / SPAEmpresarial -- 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
