-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Thursday 2006-11-09 at 08:30 -0600, Stan Glasoe wrote:
Not. RAID5 has to first write the data, then it has to calculate the parity, then it writes the parity. It can't do all three in parallel. It has to actually write the data portion so it has the necessary information to calculate the parity and then write the parity.
I don't think that is correct. So says the HOWTO: Both read and write performance usually increase, but can be hard to predict how much. Reads are similar to RAID-0 reads, writes can be either rather expensive (requiring read-in prior to write, in order to be able to calculate the correct parity information), or similar to RAID-1 writes. The write efficiency depends heavily on the amount of memory in the machine, and the usage pattern of the array. Heavily scattered writes are bound to be more expensive. - -- Cheers, Carlos E. R. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFFU07TtTMYHG2NR9URAkgQAJ0aHAfY7FMG9O/vlKyXc8dxMPGwtACdG0/+ tq/yMD1vN4V+YHlZ7wE9cIA= =Iflu -----END PGP SIGNATURE-----