Re: [zfs-discuss] Re: raid-z random read performance

2006-11-02 Thread James Blackburn
Checksum the individual RAID-5 blocks, rather than the entire stripe? Depending on your the number of drives in your RAID-Z, this will increase your metadata size by N-1 * 32 bytes. Would this not be an undesirable cost increase on the metadata size? In more detail: Allow the pointer to t

[zfs-discuss] Re: raid-z random read performance

2006-11-02 Thread Anton B. Rang
> I don't see how you can get both end-to-end data integrity and > read avoidance. Checksum the individual RAID-5 blocks, rather than the entire stripe? In more detail: Allow the pointer to the block to contain one checksum per device used (the count will vary if you're using a RAID-Z style algo