Re: FYI (large devices = looooonnngg processing times)
On 04/27/2013 08:06 PM, Curt Howland wrote: dd if=/dev/random of=/dev/sdb or whatever it was, USB3. 6 days later You might have just run out of entropy on the PRNG. That and small writes will kill you. Try: dd if=/dev/urandom of=/dev/sdX bs=2M next time. It should finish in several hours. A 20TB ZFS array will be done in less than a day (the compression ratio is wonderful with /dev/zero...). That and a scrub will let you know which disks got dropping in shipping. -Bill -- Bill McGonigle, Owner BFC Computing, LLC http://bfccomputing.com/ Telephone: +1.855.SW.LIBRE Email, IM, VOIP: b...@bfccomputing.com VCard: http://bfccomputing.com/vcard/bill.vcf Social networks: bill_mcgonigle/bill.mcgonigle ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: FYI (large devices = looooonnngg processing times)
ZFS added RAIDZ3 (triple parity) was because the likelihood of hitting another error before a resilver finishes is likely with 3TB and current ECC on drives today. If you're using 4 TB drives, you should be using double parity (RAID6 or 3 way mirrors). On Sat, Apr 27, 2013 at 7:50 PM, Michael ODonnell michael.odonn...@comcast.net wrote: Even on just a silly little RAID1 mirror on a multi-Tb array I dread seeing the various messages announcing routine maintenance and diagnostic operations as they take forever and don't come for free, resource-wise... ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: FYI (large devices = looooonnngg processing times)
Even on just a silly little RAID1 mirror on a multi-Tb array I dread seeing the various messages announcing routine maintenance and diagnostic operations as they take forever and don't come for free, resource-wise... ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: FYI (large devices = looooonnngg processing times)
-BEGIN PGP SIGNED MESSAGE- Hash: SHA256 On Saturday 27 April 2013, Michael ODonnell was heard to say: Even on just a silly little RAID1 mirror on a multi-Tb array I dread seeing the various messages announcing routine maintenance and diagnostic operations as they take forever and don't come for free, resource-wise... When I bought a 1TB external drive and decided to encrypt it, I wanted to randomize if first, dd if=/dev/random of=/dev/sdb or whatever it was, USB3. 6 days later I made the mistake of playing a SpaceRip youtube video in full screen, and Flash locked up the box. The randomizing still wasn't done, but I gave up on that and encrypted the drive anyway. Yes, TerraByte drives are, as was said to Cyrano DeBergerac, Rather Large. - -- The Magistrate, enrobed in taxes, condemns the thief in stolen rags. -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.12 (GNU/Linux) iFcDBQFRfGf3tk9X6NaR4akRCHi6AQCZHxxVA7JmSQsg+uz9BoLE6vJr014LzNCR Q5kz+cJuYgD/QWL0KLShfQKfOaSNKlB7YRAhgFPTA8sBqpSZkql+ck8= =Ymsy -END PGP SIGNATURE- ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: FYI (large devices = looooonnngg processing times)
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I remember back when the Digital TurboLaser systems came out. At the time they were enormous, and my job was to develop testing tools for them. Management just about fell off their chairs when I told them it would take a *week* (running 24x7) just to create a 1 TB file with random data (as in RND(0)) for testing. And a little under 2 weeks to create 1 million 1K files with random data for testing. - --Bruce On 04/27/2013 08:06 PM, Curt Howland wrote: On Saturday 27 April 2013, Michael ODonnell was heard to say: Even on just a silly little RAID1 mirror on a multi-Tb array I dread seeing the various messages announcing routine maintenance and diagnostic operations as they take forever and don't come for free, resource-wise... When I bought a 1TB external drive and decided to encrypt it, I wanted to randomize if first, dd if=/dev/random of=/dev/sdb or whatever it was, USB3. 6 days later I made the mistake of playing a SpaceRip youtube video in full screen, and Flash locked up the box. The randomizing still wasn't done, but I gave up on that and encrypted the drive anyway. Yes, TerraByte drives are, as was said to Cyrano DeBergerac, Rather Large. -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlF8bgIACgkQ/TBScWXa5Ijf0gCcDXqYQIpizOYUg+02cB/a5xk0 u8sAoKiiOaqDv/qPeIgM/p3BDPk5JX5p =vvE1 -END PGP SIGNATURE- ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
