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2d
comment GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot
I've updated the question to reflect that in a recovery mode /dev/md0 is mounted to /mnt/0 while in live mode to /boot, also /dev/md2 is not mapped to / in a recovery mode. Since grub-install invokes grub-mkimage with some arguments, I guess something could go wrong.
2d
revised GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot
added 195 characters in body
2d
comment GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot
what do you mean by drive mapping? I had it in mirror mode, and one drive did fail, so I should be able to fix the boot unless content of /boot partition becomes unfixable by running something which will copy boot from recovery mode to /mnt/2 (md2)
2d
awarded  Commentator
2d
comment GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot
I'm now in a recovery mode which is using different kernel and md is mounted under /mnt/0 and /mnt/2... If I run grub-install /dev/sda now what will happen?
May
1
asked GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot
May
1
comment DNS: MX listing points to google apps and A listing to my own server. Can I send emails from my own server without being classified as spam?
for the reference, if 222.222.222.222 has reverse DNS record does it make sense to add SPF record?
Jan
29
asked Is 10 character (letters and numbers mixed) password strong enough for Internet Servers?
Apr
16
comment iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?
This might be correct. fread and read has a parameter which specifies file size, so hard drive controller can know for each block which clusters it has to read. When having multiple threads reading, it can benefit from optimizing the head movement between each blocks.
Apr
14
comment iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?
3.2.0-60-generic I think the underlying reason might be RAID1 with partition, with 2+ threads one thread reads from one drive, another from another drive (or something like that theoretically).
Apr
13
comment iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?
it's reading blocks of 300K. iozone creates files and read blocks of specific size, it is a HD benchmark software.
Apr
13
revised iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?
edited title
Apr
13
asked iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?
Apr
10
awarded  Teacher
Apr
10
answered How can I force users from USA to go the USA server and visitors from UK to go to the UK server
Apr
10
comment What are challenges with Linux Storage Servers having 7 or 15 drives?
images are 400KB in size, so according to this overclock.net/t/844026/average-7200rpm-read-speed maybe read speak is about 10MB/s-30MBs without RAID. Without actual testing I could only make rought guesses. Thanks for pointing too high HD speeds.
Apr
10
comment What are challenges with Linux Storage Servers having 7 or 15 drives?
servers with 7 or 15 drives are uncommon in standard dedicated offerings, if you go to dreamhost, godaddy or rackspace. you might not find it. The largest available I could find is on iweb with 8x4TB. But anyhow, if servers are replaceable among different providers it brings flexibility, that's what I'd call "commodity hardware" - whats easily available everywhere
Apr
10
revised What are challenges with Linux Storage Servers having 7 or 15 drives?
clarification
Apr
10
asked What are challenges with Linux Storage Servers having 7 or 15 drives?
Apr
9
comment DegradedArray event after rsync but later mdadm and smartctl do not show any issue
Anyhow, GREAT CATCH! I'm amazed what people do notice at serverfault!